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{"title"=>"Structural and Biochemical Basis for Development of Influenza Virus Inhibitors Targeting the PA Endonuclease", "type"=>"journal", "authors"=>[{"first_name"=>"Rebecca M.", "last_name"=>"DuBois"}, {"first_name"=>"P. Jake", "last_name"=>"Slavish"}, {"first_name"=>"Brandi M.", "last_name"=>"Baughman"}, {"first_name"=>"Mi-Kyung", "last_name"=>"Yun"}, {"first_name"=>"Ju", "last_name"=>"Bao"}, {"first_name"=>"Richard J.", "last_name"=>"Webby"}, {"first_name"=>"Thomas R.", "last_name"=>"Webb"}, {"first_name"=>"Stephen W.", "last_name"=>"White"}], "year"=>2012, "source"=>"PLoS Pathogens", "identifiers"=>{"doi"=>"10.1371/journal.ppat.1002830", "isbn"=>"1553-7374 (Electronic)\\r1553-7366 (Linking)", "pmid"=>"22876176", "issn"=>"1553-7374"}, "id"=>"89485836-3d50-32dd-af18-5862fe2d726d", "abstract"=>"Emerging influenza viruses are a serious threat to human health because of their pandemic potential. A promising target for the development of novel anti-influenza therapeutics is the PA protein, whose endonuclease activity is essential for viral replication. Translation of viral mRNAs by the host ribosome requires mRNA capping for recognition and binding, and the necessary mRNA caps are cleaved or \"snatched\" from host pre-mRNAs by the PA endonuclease. The structure-based development of inhibitors that target PA endonuclease is now possible with the recent crystal structure of the PA catalytic domain. In this study, we sought to understand the molecular mechanism of inhibition by several compounds that are known or predicted to block endonuclease-dependent polymerase activity. Using an in vitro endonuclease activity assay, we show that these compounds block the enzymatic activity of the isolated PA endonuclease domain. Using X-ray crystallography, we show how these inhibitors coordinate the two-metal endonuclease active site and engage the active site residues. Two structures also reveal an induced-fit mode of inhibitor binding. The structures allow a molecular understanding of the structure-activity relationship of several known influenza inhibitors and the mechanism of drug resistance by a PA mutation. Taken together, our data reveal new strategies for structure-based design and optimization of PA endonuclease inhibitors.", "link"=>"http://www.mendeley.com/research/structural-biochemical-basis-development-influenza-virus-inhibitors-targeting-pa-endonuclease-5", "reader_count"=>55, "reader_count_by_academic_status"=>{"Unspecified"=>2, "Professor > Associate Professor"=>3, "Researcher"=>17, "Student > Doctoral Student"=>3, "Student > Ph. D. Student"=>14, "Student > Postgraduate"=>2, "Other"=>1, "Student > Master"=>3, "Student > Bachelor"=>8, "Professor"=>2}, "reader_count_by_user_role"=>{"Unspecified"=>2, "Professor > Associate Professor"=>3, "Researcher"=>17, "Student > Doctoral Student"=>3, "Student > Ph. D. Student"=>14, "Student > Postgraduate"=>2, "Other"=>1, "Student > Master"=>3, "Student > Bachelor"=>8, "Professor"=>2}, "reader_count_by_subject_area"=>{"Unspecified"=>3, "Engineering"=>1, "Biochemistry, Genetics and Molecular Biology"=>6, "Agricultural and Biological Sciences"=>26, "Medicine and Dentistry"=>3, "Design"=>1, "Business, Management and Accounting"=>1, "Physics and Astronomy"=>1, "Chemistry"=>11, "Psychology"=>1, "Immunology and Microbiology"=>1}, "reader_count_by_subdiscipline"=>{"Design"=>{"Design"=>1}, "Engineering"=>{"Engineering"=>1}, "Medicine and Dentistry"=>{"Medicine and Dentistry"=>3}, "Chemistry"=>{"Chemistry"=>11}, "Physics and Astronomy"=>{"Physics and Astronomy"=>1}, "Psychology"=>{"Psychology"=>1}, "Immunology and Microbiology"=>{"Immunology and Microbiology"=>1}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>26}, "Business, Management and Accounting"=>{"Business, Management and Accounting"=>1}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>6}, "Unspecified"=>{"Unspecified"=>3}}, "reader_count_by_country"=>{"South Korea"=>1, "United States"=>1, "United Kingdom"=>2, "Chile"=>1, "France"=>1, "India"=>1, "Spain"=>1}, "group_count"=>2}

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• {"id"=>"231139873933905920", "text"=>"Two exciting complimentary studies on the influenza virus PA protein http://t.co/hJzmzkQV http://t.co/BDMARMQI", "created_at"=>"2012-08-02T21:30:14Z", "user"=>"PLOSPathogens", "user_name"=>"PLOS Pathogens", "user_profile_image"=>"http://a0.twimg.com/profile_images/2436475368/lo7djbb03u12ciphbbs2_normal.jpeg"}

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Figshare

• {"files"=>["https://ndownloader.figshare.com/files/598362"], "description"=>"<p>(<b>A</b>) Sequence alignment of PA_N from influenza A, B, and C. Consensus sequences were determined from more than 13,000 sequences using the online database <a href=\"http://www.fludb.org\" target=\"_blank\">www.fludb.org</a>. The secondary structure of PA_N from influenza A is shown above the sequence alignment. Residues in a solid red background are identical between the influenza A, B, and C consensus sequences. Residues that are >99.9% conserved in all sequences analyzed are underlined in cyan. Stars indicate key active site residues. (<b>B</b>) Surface representation of the PA_N^ΔLoop active site cleft. Manganese ions (Mn1 and Mn2) are shown as green spheres. The highly conserved cleft is colored red. Residues that are identical between influenza A, B, and C consensus sequences are not underlined, and residues that are >99.9% conserved are underlined in cyan. (<b>C</b>) Surface representation of PA_N^ΔLoop active site cleft with overlays of compounds <b>1</b> (red), <b>2</b> (yellow), <b>3</b> (purple), <b>4</b> (green), <b>5</b> (blue), and <b>6</b> (cyan). The compounds occupy four (3–6) of the six binding pockets discussed in the text. The orientation and depicted surface are identical to those shown in panel <b>B</b>. (<b>D</b>) Superposition of bound compounds <b>1, 2, 3 and 5</b> (same coloring as panel <b>C</b>) after structural alignment of the entire PA_N^ΔLoop domain. For clarity, molecules B of <b>2</b> and <b>5</b> are not shown. Also not shown for clarity are compounds <b>4</b> and <b>6</b> because their metal-binding scaffolds overlay perfectly with <b>5</b>. Manganese ions (Mn1 and Mn2) are shown as green spheres. (<b>E</b>) Ordered water molecules found in at least three of the four molecules in the crystallographic asymmetric unit are shown as red spheres. PA_N^ΔLoop is shown as gray cartoon. Manganese ions (Mn1 and Mn2) are shown as green spheres. Key active site residues are shown in magenta carbon atoms and other residues interacting with the compound or discussed in the text are shown in gray carbon atoms. A sulfate ion is shown as ball-and-stick and colored yellow (sulfur) and red (oxygen). This sulfate is bound at the same location as a predicted phosphate group of nucleic acid in a model of the PA_N-substrate complex <a href=\"http://www.plospathogens.org/article/info:doi/10.1371/journal.ppat.1002830#ppat.1002830-Zhao1\" target=\"_blank\">[25]</a>. Black dotted lines represent molecular interactions less than 3.2 Å away.</p>", "links"=>[], "tags"=>["residues", "ordered", "molecules"], "article_id"=>268845, "categories"=>["Biotechnology", "Biochemistry", "Virology", "Biophysics"], "users"=>["Rebecca M. DuBois", "P. Jake Slavish", "Brandi M. Baughman", "Mi-Kyung Yun", "Ju Bao", "Richard J. Webby", "Thomas R. Webb", "Stephen W. White"], "doi"=>"https://dx.doi.org/10.1371/journal.ppat.1002830.g008", "stats"=>{"downloads"=>1, "page_views"=>9, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Conserved_residues_and_ordered_water_molecules_in_the_PA_N_active_site_cleft_/268845", "title"=>"Conserved residues and ordered water molecules in the PA_N active site cleft.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-08-02 02:27:25"}
• {"files"=>["https://ndownloader.figshare.com/files/598457"], "description"=>"a<p>Data were collected from a single crystal. Values for the highest-resolution shell are shown in parentheses.</p>b<p><i>R</i>_free was calculated using 5% of the reflections.</p>", "links"=>[], "tags"=>["Virology", "biotechnology", "biophysics", "Biochemistry"], "article_id"=>268940, "categories"=>["Biotechnology", "Biochemistry", "Virology", "Biophysics"], "users"=>["Rebecca M. DuBois", "P. Jake Slavish", "Brandi M. Baughman", "Mi-Kyung Yun", "Ju Bao", "Richard J. Webby", "Thomas R. Webb", "Stephen W. White"], "doi"=>"https://dx.doi.org/10.1371/journal.ppat.1002830.t001", "stats"=>{"downloads"=>0, "page_views"=>8, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Crystallographic_statistics_/268940", "title"=>"Crystallographic statistics.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2012-08-02 02:29:00"}
• {"files"=>["https://ndownloader.figshare.com/files/597631"], "description"=>"<p>Oxygen atoms that coordinate manganese ions in the active site of PA_N^ΔLoop are colored red.</p>", "links"=>[], "tags"=>["structures", "compounds"], "article_id"=>268122, "categories"=>["Biotechnology", "Biochemistry", "Virology", "Biophysics"], "users"=>["Rebecca M. DuBois", "P. Jake Slavish", "Brandi M. Baughman", "Mi-Kyung Yun", "Ju Bao", "Richard J. Webby", "Thomas R. Webb", "Stephen W. White"], "doi"=>"https://dx.doi.org/10.1371/journal.ppat.1002830.g002", "stats"=>{"downloads"=>1, "page_views"=>4, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Chemical_structures_of_compounds_used_in_this_study_/268122", "title"=>"Chemical structures of compounds used in this study.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-08-02 02:15:22"}
• {"files"=>["https://ndownloader.figshare.com/files/597732"], "description"=>"<p>Compounds <b>1</b>–<b>6</b> (<b>A</b>–<b>F</b>, respectively) were incubated at increasing concentrations (µM) with 15 µM PA_N and single-stranded DNA plasmid M13mp18. Reaction products were resolved on a 1.0% agarose gel and stained with ethidium bromide. Control lanes (‘C’) contained no PA_N in the reaction mixture. Molecular weight (MW) ladder (kb) is shown on the left.</p>", "links"=>[], "tags"=>["endonuclease"], "article_id"=>268218, "categories"=>["Biotechnology", "Biochemistry", "Virology", "Biophysics"], "users"=>["Rebecca M. DuBois", "P. Jake Slavish", "Brandi M. Baughman", "Mi-Kyung Yun", "Ju Bao", "Richard J. Webby", "Thomas R. Webb", "Stephen W. White"], "doi"=>"https://dx.doi.org/10.1371/journal.ppat.1002830.g003", "stats"=>{"downloads"=>1, "page_views"=>5, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Inhibition_of_PA_N_endonuclease_activity_by_known_and_predicted_inhibitors_/268218", "title"=>"Inhibition of PA_N endonuclease activity by known and predicted inhibitors.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-08-02 02:16:58"}
• {"files"=>["https://ndownloader.figshare.com/files/598163"], "description"=>"<p><i>^a</i>Published results in a competitive binding fluorescence polarization assay with PA_N<a href=\"http://www.plospathogens.org/article/info:doi/10.1371/journal.ppat.1002830#ppat.1002830-Baughman1\" target=\"_blank\">[40]</a>. ^b,cAntiviral activity as measured by inhibition of viral plaque formation in this study<i>^b</i> or previously<i>^c</i><a href=\"http://www.plospathogens.org/article/info:doi/10.1371/journal.ppat.1002830#ppat.1002830-Baughman1\" target=\"_blank\">[40]</a>. <i>^d,e</i>Compound cytotoxicity in MDCK cells after 72 hours as measured in this study<i>^d</i> or previously<i>^e</i><a href=\"http://www.plospathogens.org/article/info:doi/10.1371/journal.ppat.1002830#ppat.1002830-Baughman1\" target=\"_blank\">[40]</a>.</p>", "links"=>[], "tags"=>["binding", "antiviral", "cytotoxicities", "compounds"], "article_id"=>268646, "categories"=>["Biotechnology", "Biochemistry", "Virology", "Biophysics"], "users"=>["Rebecca M. DuBois", "P. Jake Slavish", "Brandi M. Baughman", "Mi-Kyung Yun", "Ju Bao", "Richard J. Webby", "Thomas R. Webb", "Stephen W. White"], "doi"=>"https://dx.doi.org/10.1371/journal.ppat.1002830.g007", "stats"=>{"downloads"=>0, "page_views"=>3, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Reported_PA_N_binding_activities_antiviral_activities_and_cytotoxicities_of_compounds_4_and_5_and_related_compounds_/268646", "title"=>"Reported PA_N binding activities, antiviral activities, and cytotoxicities of compounds 4 and 5 and related compounds.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-08-02 02:24:06"}
• {"files"=>["https://ndownloader.figshare.com/files/597523"], "description"=>"<p>(<b>A</b>) Schematic of PA_N (magenta) and PA_N^ΔLoop (green), and location of the 22-residue loop (orange) replaced by a Gly-Gly-Ser linker in the PA_N^ΔLoop construct. (<b>B</b>) Two orthogonal views of the overlay of the crystal structures of PA_N and PA_N^ΔLoop, colored as in <b>A</b>. Key active site residues are shown in stick representation, the paired manganese ions are shown as spheres, and the N- and C-termini are labeled. The coordinates for PA_N are from PDB entry 2W69. The atomic coordinates and structure factors for PA_N^ΔLoop have been deposited in the Protein Data Bank as PDB entry 4E5E. (<b>C</b>) Coomassie-stained SDS-PAGE of PA_N and PA_N^ΔLoop showing the amount of protein (µM) in a 10 µl endonuclease activity assay reaction. Molecular weight (MW) markers (kD) are shown on the left. (<b>D</b>) Endonuclease activity assay with PA_N and PA_N^ΔLoop. Single-stranded DNA plasmid M13mp18 was incubated with increasing concentrations (µM) of PA_N or PA_N^ΔLoop. Reactions products were resolved on a 1.0% agarose gel stained with ethidium bromide. Molecular weight (MW) ladder (kb) is shown on the left.</p>", "links"=>[], "tags"=>["endonuclease"], "article_id"=>268016, "categories"=>["Biotechnology", "Biochemistry", "Virology", "Biophysics"], "users"=>["Rebecca M. DuBois", "P. Jake Slavish", "Brandi M. Baughman", "Mi-Kyung Yun", "Ju Bao", "Richard J. Webby", "Thomas R. Webb", "Stephen W. White"], "doi"=>"https://dx.doi.org/10.1371/journal.ppat.1002830.g001", "stats"=>{"downloads"=>2, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Crystal_structure_and_endonuclease_activity_of_PA_N_916_Loop_/268016", "title"=>"Crystal structure and endonuclease activity of PA_N^ΔLoop.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-08-02 02:13:36"}
• {"files"=>["https://ndownloader.figshare.com/files/313207", "https://ndownloader.figshare.com/files/313282", "https://ndownloader.figshare.com/files/313595", "https://ndownloader.figshare.com/files/313916", "https://ndownloader.figshare.com/files/313969", "https://ndownloader.figshare.com/files/314068", "https://ndownloader.figshare.com/files/314106"], "description"=>"<div><p>Emerging influenza viruses are a serious threat to human health because of their pandemic potential. A promising target for the development of novel anti-influenza therapeutics is the PA protein, whose endonuclease activity is essential for viral replication. Translation of viral mRNAs by the host ribosome requires mRNA capping for recognition and binding, and the necessary mRNA caps are cleaved or “snatched” from host pre-mRNAs by the PA endonuclease. The structure-based development of inhibitors that target PA endonuclease is now possible with the recent crystal structure of the PA catalytic domain. In this study, we sought to understand the molecular mechanism of inhibition by several compounds that are known or predicted to block endonuclease-dependent polymerase activity. Using an <em>in vitro</em> endonuclease activity assay, we show that these compounds block the enzymatic activity of the isolated PA endonuclease domain. Using X-ray crystallography, we show how these inhibitors coordinate the two-metal endonuclease active site and engage the active site residues. Two structures also reveal an induced-fit mode of inhibitor binding. The structures allow a molecular understanding of the structure-activity relationship of several known influenza inhibitors and the mechanism of drug resistance by a PA mutation. Taken together, our data reveal new strategies for structure-based design and optimization of PA endonuclease inhibitors.</p> </div>", "links"=>[], "tags"=>["biochemical", "influenza", "inhibitors", "targeting", "pa", "endonuclease"], "article_id"=>121771, "categories"=>["Biotechnology", "Biochemistry", "Cancer", "Biophysics"], "users"=>["Rebecca M. DuBois", "P. Jake Slavish", "Brandi M. Baughman", "Mi-Kyung Yun", "Ju Bao", "Richard J. Webby", "Thomas R. Webb", "Stephen W. White"], "doi"=>["https://dx.doi.org/10.1371/journal.ppat.1002830.s001", "https://dx.doi.org/10.1371/journal.ppat.1002830.s002", "https://dx.doi.org/10.1371/journal.ppat.1002830.s003", "https://dx.doi.org/10.1371/journal.ppat.1002830.s004", "https://dx.doi.org/10.1371/journal.ppat.1002830.s005", "https://dx.doi.org/10.1371/journal.ppat.1002830.s006", "https://dx.doi.org/10.1371/journal.ppat.1002830.s007"], "stats"=>{"downloads"=>7, "page_views"=>18, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Structural_and_Biochemical_Basis_for_Development_of_Influenza_Virus_Inhibitors_Targeting_the_PA_Endonuclease/121771", "title"=>"Structural and Biochemical Basis for Development of Influenza Virus Inhibitors Targeting the PA Endonuclease", "pos_in_sequence"=>0, "defined_type"=>4, "published_date"=>"2012-08-02 00:29:31"}
• {"files"=>["https://ndownloader.figshare.com/files/598070"], "description"=>"<p><i>^a</i>Published results in an influenza virus <i>in vitro</i> transcription assay <a href=\"http://www.plospathogens.org/article/info:doi/10.1371/journal.ppat.1002830#ppat.1002830-Tomassini1\" target=\"_blank\">[15]</a>. <i>^b</i>Published results in an influenza virus <i>in vitro</i> transcription assay <a href=\"http://www.plospathogens.org/article/info:doi/10.1371/journal.ppat.1002830#ppat.1002830-Hastings1\" target=\"_blank\">[26]</a>.</p>", "links"=>[], "tags"=>["4-substituted", "inhibitors", "transcription", "assay", "influenza"], "article_id"=>268554, "categories"=>["Biotechnology", "Biochemistry", "Virology", "Biophysics"], "users"=>["Rebecca M. DuBois", "P. Jake Slavish", "Brandi M. Baughman", "Mi-Kyung Yun", "Ju Bao", "Richard J. Webby", "Thomas R. Webb", "Stephen W. White"], "doi"=>"https://dx.doi.org/10.1371/journal.ppat.1002830.g006", "stats"=>{"downloads"=>0, "page_views"=>1, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Reported_IC_50_values_of_4_substituted_2_4_dioxobutanoic_acid_inhibitors_determined_in_an_in_vitro_transcription_assay_with_influenza_A_polymerase_/268554", "title"=>"Reported IC₅₀ values of 4-substituted 2,4-dioxobutanoic acid inhibitors determined in an <i>in vitro</i> transcription assay with influenza A polymerase.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-08-02 02:22:34"}
• {"files"=>["https://ndownloader.figshare.com/files/597983"], "description"=>"<p><i>^a</i>Published results in an influenza virus <i>in vitro</i> transcription assay <a href=\"http://www.plospathogens.org/article/info:doi/10.1371/journal.ppat.1002830#ppat.1002830-Parkes1\" target=\"_blank\">[29]</a>. <i>^b</i>Published results in an influenza virus <i>in vitro</i> transcription assay <a href=\"http://www.plospathogens.org/article/info:doi/10.1371/journal.ppat.1002830#ppat.1002830-Tomassini2\" target=\"_blank\">[30]</a>.</p>", "links"=>[], "tags"=>["inhibitors", "transcription", "assay", "influenza"], "article_id"=>268467, "categories"=>["Biotechnology", "Biochemistry", "Virology", "Biophysics"], "users"=>["Rebecca M. DuBois", "P. Jake Slavish", "Brandi M. Baughman", "Mi-Kyung Yun", "Ju Bao", "Richard J. Webby", "Thomas R. Webb", "Stephen W. White"], "doi"=>"https://dx.doi.org/10.1371/journal.ppat.1002830.g005", "stats"=>{"downloads"=>0, "page_views"=>1, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Reported_IC_50_values_of_Flutimide_Flutimide_related_and_N_hydroxyimide_inhibitors_determined_in_an_in_vitro_transcription_assay_with_influenza_A_polymerase_/268467", "title"=>"Reported IC₅₀ values of Flutimide, Flutimide-related, and <i>N</i>-hydroxyimide inhibitors determined in an <i>in vitro</i> transcription assay with influenza A polymerase.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-08-02 02:21:07"}
• {"files"=>["https://ndownloader.figshare.com/files/597868"], "description"=>"<p>PA_N^ΔLoop is shown as gray cartoon. Compounds are shown as ball-and-stick models and are colored yellow (carbon), blue (nitrogen), red (oxygen), and orange (chlorine). Manganese ions (Mn1 and Mn2) are shown as green spheres. The carbon atoms of key active site residues are colored magenta, and the carbon atoms of other residues interacting with the compound or discussed in the text are colored cyan. An ordered water molecule (H₂O¹²²) is shown as a red sphere. Black dotted lines represent molecular interactions less than 3.2 Å away. In the case of compounds <b>2</b> and <b>5</b>, two molecules (yellow labels A and B) are bound in the PA_N^ΔLoop active site. Gray arrows (panels <b>B</b> and <b>C</b>) show the movement of helix-α3 residue Tyr24 compared with the structure of PA_N^ΔLoop-Apo. The atomic coordinates and structure factors for PA_N^ΔLoop bound to compounds <b>1</b>–<b>6</b> have been deposited in the Protein Data Bank as PDB entries 4E5F, 4E5G, 4E5H, 4E5I, 4E5J, and 4E5L, respectively.</p>", "links"=>[], "tags"=>["structures", "bound", "compounds"], "article_id"=>268356, "categories"=>["Biotechnology", "Biochemistry", "Virology", "Biophysics"], "users"=>["Rebecca M. DuBois", "P. Jake Slavish", "Brandi M. Baughman", "Mi-Kyung Yun", "Ju Bao", "Richard J. Webby", "Thomas R. Webb", "Stephen W. White"], "doi"=>"https://dx.doi.org/10.1371/journal.ppat.1002830.g004", "stats"=>{"downloads"=>0, "page_views"=>2, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Crystal_structures_of_PA_N_916_Loop_bound_to_compounds_1_8211_6_A_8211_F_respectively_/268356", "title"=>"Crystal structures of PA_N^ΔLoop bound to compounds 1–6 (A–F, respectively).", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-08-02 02:19:16"}

PMC Usage Stats | Further Information

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• {"unique-ip"=>"10", "full-text"=>"11", "pdf"=>"3", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"15", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2016", "month"=>"8"}
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• {"unique-ip"=>"8", "full-text"=>"5", "pdf"=>"2", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"1", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2016", "month"=>"10"}
• {"unique-ip"=>"6", "full-text"=>"6", "pdf"=>"2", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2016", "month"=>"11"}
• {"unique-ip"=>"6", "full-text"=>"7", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2016", "month"=>"12"}
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• {"unique-ip"=>"13", "full-text"=>"14", "pdf"=>"4", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"2", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2017", "month"=>"11"}
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• {"unique-ip"=>"11", "full-text"=>"12", "pdf"=>"5", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"7", "cited-by"=>"0", "year"=>"2018", "month"=>"1"}
• {"unique-ip"=>"16", "full-text"=>"15", "pdf"=>"6", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"8", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2018", "month"=>"3"}
• {"unique-ip"=>"6", "full-text"=>"6", "pdf"=>"1", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"2", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2019", "month"=>"1"}
• {"unique-ip"=>"14", "full-text"=>"27", "pdf"=>"5", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"2", "supp-data"=>"4", "cited-by"=>"0", "year"=>"2018", "month"=>"4"}
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• {"unique-ip"=>"12", "full-text"=>"4", "pdf"=>"3", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"3", "supp-data"=>"4", "cited-by"=>"0", "year"=>"2018", "month"=>"7"}
• {"unique-ip"=>"9", "full-text"=>"10", "pdf"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2018", "month"=>"8"}
• {"unique-ip"=>"7", "full-text"=>"4", "pdf"=>"1", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"1", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2018", "month"=>"9"}
• {"unique-ip"=>"10", "full-text"=>"8", "pdf"=>"2", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2018", "month"=>"10"}
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• {"unique-ip"=>"10", "full-text"=>"12", "pdf"=>"2", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"1", "supp-data"=>"7", "cited-by"=>"0", "year"=>"2019", "month"=>"2"}
• {"unique-ip"=>"19", "full-text"=>"10", "pdf"=>"4", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"7", "supp-data"=>"1", "cited-by"=>"0", "year"=>"2019", "month"=>"3"}
• {"unique-ip"=>"23", "full-text"=>"8", "pdf"=>"6", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"8", "supp-data"=>"3", "cited-by"=>"0", "year"=>"2019", "month"=>"4"}
• {"unique-ip"=>"33", "full-text"=>"18", "pdf"=>"5", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"13", "supp-data"=>"4", "cited-by"=>"1", "year"=>"2019", "month"=>"5"}
• {"unique-ip"=>"6", "full-text"=>"4", "pdf"=>"2", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2019", "month"=>"8"}
• {"unique-ip"=>"15", "full-text"=>"15", "pdf"=>"4", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"2", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2019", "month"=>"9"}
• {"unique-ip"=>"30", "full-text"=>"12", "pdf"=>"2", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"23", "supp-data"=>"0", "cited-by"=>"2", "year"=>"2019", "month"=>"10"}
• {"unique-ip"=>"17", "full-text"=>"11", "pdf"=>"10", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"2", "year"=>"2019", "month"=>"12"}
• {"unique-ip"=>"14", "full-text"=>"12", "pdf"=>"3", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"1", "cited-by"=>"0", "year"=>"2020", "month"=>"2"}
• {"unique-ip"=>"15", "full-text"=>"8", "pdf"=>"3", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"1", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2020", "month"=>"3"}
• {"unique-ip"=>"17", "full-text"=>"25", "pdf"=>"4", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2020", "month"=>"4"}
• {"unique-ip"=>"15", "full-text"=>"24", "pdf"=>"2", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"4", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2020", "month"=>"5"}
• {"unique-ip"=>"22", "full-text"=>"22", "pdf"=>"4", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2020", "month"=>"6"}
• {"unique-ip"=>"10", "full-text"=>"9", "pdf"=>"3", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2020", "month"=>"7"}
• {"unique-ip"=>"8", "full-text"=>"4", "pdf"=>"1", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"6", "cited-by"=>"0", "year"=>"2020", "month"=>"8"}
• {"unique-ip"=>"19", "full-text"=>"14", "pdf"=>"5", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"3", "cited-by"=>"0", "year"=>"2020", "month"=>"9"}
• {"unique-ip"=>"23", "full-text"=>"16", "pdf"=>"1", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"3", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2020", "month"=>"10"}
• {"unique-ip"=>"7", "full-text"=>"7", "pdf"=>"2", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2020", "month"=>"11"}
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Relative Metric

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F1000Prime