1qq9: Difference between revisions
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< | ==STREPTOMYCES GRISEUS AMINOPEPTIDASE COMPLEXED WITH METHIONINE== | ||
<StructureSection load='1qq9' size='340' side='right'caption='[[1qq9]], [[Resolution|resolution]] 1.53Å' scene=''> | |||
You may | == Structural highlights == | ||
<table><tr><td colspan='2'>[[1qq9]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptomyces_griseus Streptomyces griseus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QQ9 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1QQ9 FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.53Å</td></tr> | |||
- | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=MET:METHIONINE'>MET</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></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=1qq9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qq9 OCA], [https://pdbe.org/1qq9 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1qq9 RCSB], [https://www.ebi.ac.uk/pdbsum/1qq9 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1qq9 ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/APX_STRGG APX_STRGG] An exopeptidase specific for larger hydrophobic amino acids (especially leucine), no cleavage occurs if the next residue is proline (PubMed:8444149).<ref>PMID:2503378</ref> <ref>PMID:8444149</ref> <ref>PMID:8665903</ref> | |||
== 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/qq/1qq9_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=1qq9 ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
SGAP is an aminopeptidase present in the extracellular fluid of Streptomyces griseus cultures. It is a double-zinc enzyme with a strong preference for large hydrophobic amino-terminus residues. It is a monomeric (30 kDa) heat-stable enzyme, with a high and efficient catalytic activity modulated by calcium ions. The small size, high activity and heat stability make SGAP a very attractive enzyme for various biotechnological applications. Only one other related aminopeptidase (Aeromonas proteolytica AP; AAP) has been structurally analyzed to date and its structure was shown to be considerably similar to SGAP, despite the low sequence homology between the two enzymes. The motivation for the detailed structural analysis of SGAP originated from a strong mechanistic interest in the family of double-zinc aminopeptidases, combined with the high potential applicability of these enzymes. The 1.75 A crystallographic structure of native SGAP has been previously reported, but did not allow critical mechanistic interpretations owing to inconclusive structural regions around the active site. A more accurate structure of SGAP at 1.58 A resolution is reported in this paper, along with the 1.53 A resolution structure of the SGAP complex with inhibitory methionine, which is also a product of the SGAP catalytic process. These two high-resolution structures enable a better understanding of the SGAP binding mode of both substrates and products. These studies allowed the tracing of the previously disordered region of the enzyme (Glu196-Arg202) and the identification of some of the functional groups of the enzyme that are involved in enzyme-substrate interactions (Asp160, Met161, Gly201, Arg202 and Phe219). These studies also suggest that Glu131 is directly involved in the catalytic mechanism of SGAP, probably as the hydrolytic nucleophile. The structural results are compared with a recent structure of AAP with an hydroxamate inhibitor in order to draw general functional conclusions which are relevant for this family of low molecular-weight aminopeptidases. | |||
Interactions of Streptomyces griseus aminopeptidase with a methionine product analogue: a structural study at 1.53 A resolution.,Gilboa R, Greenblatt HM, Perach M, Spungin-Bialik A, Lessel U, Wohlfahrt G, Schomburg D, Blumberg S, Shoham G Acta Crystallogr D Biol Crystallogr. 2000 May;56(Pt 5):551-8. PMID:10771423<ref>PMID:10771423</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 1qq9" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Aminopeptidase 3D structures|Aminopeptidase 3D structures]] | |||
*[[Streptomyces griseus Aminopeptidase (SGAP)|Streptomyces griseus Aminopeptidase (SGAP)]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
== | </StructureSection> | ||
[[Category: Large Structures]] | |||
== | |||
< | |||
[[Category: Streptomyces griseus]] | [[Category: Streptomyces griseus]] | ||
[[Category: Blumberg | [[Category: Blumberg S]] | ||
[[Category: Gilboa | [[Category: Gilboa R]] | ||
[[Category: Greenblatt | [[Category: Greenblatt HM]] | ||
[[Category: Lessel | [[Category: Lessel U]] | ||
[[Category: Perach | [[Category: Perach M]] | ||
[[Category: Schomburg | [[Category: Schomburg D]] | ||
[[Category: Shoham | [[Category: Shoham G]] | ||
[[Category: Spungin-Bialik | [[Category: Spungin-Bialik A]] | ||
Latest revision as of 10:16, 30 October 2024
STREPTOMYCES GRISEUS AMINOPEPTIDASE COMPLEXED WITH METHIONINESTREPTOMYCES GRISEUS AMINOPEPTIDASE COMPLEXED WITH METHIONINE
Structural highlights
FunctionAPX_STRGG An exopeptidase specific for larger hydrophobic amino acids (especially leucine), no cleavage occurs if the next residue is proline (PubMed:8444149).[1] [2] [3] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedSGAP is an aminopeptidase present in the extracellular fluid of Streptomyces griseus cultures. It is a double-zinc enzyme with a strong preference for large hydrophobic amino-terminus residues. It is a monomeric (30 kDa) heat-stable enzyme, with a high and efficient catalytic activity modulated by calcium ions. The small size, high activity and heat stability make SGAP a very attractive enzyme for various biotechnological applications. Only one other related aminopeptidase (Aeromonas proteolytica AP; AAP) has been structurally analyzed to date and its structure was shown to be considerably similar to SGAP, despite the low sequence homology between the two enzymes. The motivation for the detailed structural analysis of SGAP originated from a strong mechanistic interest in the family of double-zinc aminopeptidases, combined with the high potential applicability of these enzymes. The 1.75 A crystallographic structure of native SGAP has been previously reported, but did not allow critical mechanistic interpretations owing to inconclusive structural regions around the active site. A more accurate structure of SGAP at 1.58 A resolution is reported in this paper, along with the 1.53 A resolution structure of the SGAP complex with inhibitory methionine, which is also a product of the SGAP catalytic process. These two high-resolution structures enable a better understanding of the SGAP binding mode of both substrates and products. These studies allowed the tracing of the previously disordered region of the enzyme (Glu196-Arg202) and the identification of some of the functional groups of the enzyme that are involved in enzyme-substrate interactions (Asp160, Met161, Gly201, Arg202 and Phe219). These studies also suggest that Glu131 is directly involved in the catalytic mechanism of SGAP, probably as the hydrolytic nucleophile. The structural results are compared with a recent structure of AAP with an hydroxamate inhibitor in order to draw general functional conclusions which are relevant for this family of low molecular-weight aminopeptidases. Interactions of Streptomyces griseus aminopeptidase with a methionine product analogue: a structural study at 1.53 A resolution.,Gilboa R, Greenblatt HM, Perach M, Spungin-Bialik A, Lessel U, Wohlfahrt G, Schomburg D, Blumberg S, Shoham G Acta Crystallogr D Biol Crystallogr. 2000 May;56(Pt 5):551-8. PMID:10771423[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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