1axa

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[[Image:1axa.png|left|200px]]
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==ACTIVE-SITE MOBILITY IN HUMAN IMMUNODEFICIENCY VIRUS TYPE 1 PROTEASE AS DEMONSTRATED BY CRYSTAL STRUCTURE OF A28S MUTANT==
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<StructureSection load='1axa' size='340' side='right' caption='[[1axa]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1axa]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Human_immunodeficiency_virus_1 Human immunodeficiency virus 1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1AXA OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1AXA FirstGlance]. <br>
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</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=U0E:N-[[1-[N-ACETAMIDYL]-[1-CYCLOHEXYLMETHYL-2-HYDROXY-4-ISOPROPYL]-BUT-4-YL]-CARBONYL]-GLUTAMINYL-ARGINYL-AMIDE'>U0E</scene><br>
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<tr><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/HIV-1_retropepsin HIV-1 retropepsin], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.23.16 3.4.23.16] </span></td></tr>
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<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1axa FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1axa OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1axa RCSB], [http://www.ebi.ac.uk/pdbsum/1axa PDBsum]</span></td></tr>
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<table>
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ax/1axa_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/chain_selection.php?pdb_ID=2ata ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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The mutation Ala28 to serine in human immunodeficiency virus, type 1, (HIV-1) protease introduces putative hydrogen bonds to each active-site carboxyl group. These hydrogen bonds are ubiquitous in pepsin-like eukaryotic aspartic proteases. In order to understand the significance of this difference between HIV-1 protease and homologous, eukaryotic aspartic proteases, we solved the three-dimensional structure of A28S mutant HIV-1 protease in complex with a peptidic inhibitor U-89360E. The structure has been determined to 2.0 A resolution with an R factor of 0.194. Comparison of the mutant enzyme structure with that of the wild-type HIV-1 protease bound to the same inhibitor (Hong L, Treharne A, Hartsuck JA, Foundling S, Tang J, 1996, Biochemistry 35:10627-10633) revealed double occupancy for the Ser28 hydroxyl group, which forms a hydrogen bond either to one of the oxygen atoms of the active-site carboxyl or to the carbonyl oxygen of Asp30. We also observed marked changes in orientation of the Asp25 catalytic carboxyl groups, presumably caused by the new hydrogen bonds. These observations suggest that catalytic aspartyl groups of HIV-1 protease have significant conformational flexibility unseen in eukaryotic aspartic proteases. This difference may provide an explanation for some unique catalytic properties of HIV-1 protease.
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{{STRUCTURE_1axa| PDB=1axa | SCENE= }}
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Active-site mobility in human immunodeficiency virus, type 1, protease as demonstrated by crystal structure of A28S mutant.,Hong L, Hartsuck JA, Foundling S, Ermolieff J, Tang J Protein Sci. 1998 Feb;7(2):300-5. PMID:9521105<ref>PMID:9521105</ref>
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===ACTIVE-SITE MOBILITY IN HUMAN IMMUNODEFICIENCY VIRUS TYPE 1 PROTEASE AS DEMONSTRATED BY CRYSTAL STRUCTURE OF A28S MUTANT===
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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{{ABSTRACT_PUBMED_9521105}}
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==About this Structure==
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[[1axa]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Human_immunodeficiency_virus_1 Human immunodeficiency virus 1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1AXA OCA].
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==See Also==
==See Also==
*[[Virus protease|Virus protease]]
*[[Virus protease|Virus protease]]
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== References ==
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==Reference==
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<references/>
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<ref group="xtra">PMID:009521105</ref><ref group="xtra">PMID:019105629</ref><references group="xtra"/>
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__TOC__
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</StructureSection>
[[Category: HIV-1 retropepsin]]
[[Category: HIV-1 retropepsin]]
[[Category: Human immunodeficiency virus 1]]
[[Category: Human immunodeficiency virus 1]]

Revision as of 03:23, 7 August 2014

ACTIVE-SITE MOBILITY IN HUMAN IMMUNODEFICIENCY VIRUS TYPE 1 PROTEASE AS DEMONSTRATED BY CRYSTAL STRUCTURE OF A28S MUTANT

1axa, resolution 2.00Å

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