View source for 3apr


==BINDING OF A REDUCED PEPTIDE INHIBITOR TO THE ASPARTIC PROTEINASE FROM RHIZOPUS CHINENSIS. IMPLICATIONS FOR A MECHANISM OF ACTION==
<StructureSection load='3apr' size='340' side='right'caption='[[3apr]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3apr]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Atcc_52807 Atcc 52807]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3APR OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3APR FirstGlance]. <br>
</td></tr><tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=DHI:D-HISTIDINE'>DHI</scene>, <scene name='pdbligand=PUK:N-[(2S)-2-AMINO-3-PHENYLPROPYL]-L-PHENYLALANINE'>PUK</scene></td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Hydrolase Hydrolase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.21.103, 3.4.23.18, 3.4.23.19, 3.4.23.20, 3.4.23.21, 3.4.23.22, 3.4.23.23, 3.4.23.24, 3.4.23.25, 3.4.23.26, 3.4.23.28 and 3.4.23.30 3.4.21.103, 3.4.23.18, 3.4.23.19, 3.4.23.20, 3.4.23.21, 3.4.23.22, 3.4.23.23, 3.4.23.24, 3.4.23.25, 3.4.23.26, 3.4.23.28 and 3.4.23.30] </span></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3apr FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3apr OCA], [https://pdbe.org/3apr PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3apr RCSB], [https://www.ebi.ac.uk/pdbsum/3apr PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3apr ProSAT]</span></td></tr>
</table>
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ap/3apr_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</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/main_output.php?pdb_ID=3apr ConSurf].
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== Publication Abstract from PubMed ==
A peptide inhibitor, having the sequence D-His-Pro-Phe-His-Phe psi [CH2-NH]Phe-Val-Tyr, with a reduced bond between the two adjacent phenylalanines, has been diffused into crystals of the aspartic proteinase from Rhizopus chinensis (rhizopuspepsin, EC 3.4.23.6). X-ray diffraction data to 1.8-A resolution have been collected on the complex, which has been subjected to restrained least-squares refinement to an R-factor (R equals the sum of the absolute value of the difference between the observed and calculated structure factor amplitudes divided by the sum of the observed structure factor amplitudes) of 14.7%. The inhibitor lies within the major groove of the enzyme and is clearly defined with the exception of the amino-terminal D-histidine and the carboxyl-terminal tyrosine. The reduced peptide bond is located in the active site with close contacts to the two catalytic aspartyl groups. The active-site water molecule that is held between the two carboxyl groups is displaced by the inhibitor, as are a number of other water molecules seen in the binding groove of the native enzyme. A mechanism of action for this class of enzymes is proposed from these results.

Binding of a reduced peptide inhibitor to the aspartic proteinase from Rhizopus chinensis: implications for a mechanism of action.,Suguna K, Padlan EA, Smith CW, Carlson WD, Davies DR Proc Natl Acad Sci U S A. 1987 Oct;84(20):7009-13. PMID:3313384<ref>PMID:3313384</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 3apr" style="background-color:#fffaf0;"></div>

==See Also==
*[[Pepsin|Pepsin]]
*[[Proteinase|Proteinase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Atcc 52807]]
[[Category: Hydrolase]]
[[Category: Large Structures]]
[[Category: Davies, D R]]
[[Category: Suguna, K]]
[[Category: Aspartic proteinase]]
[[Category: Hydrolase-hydrolase inhibitor complex]]