This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.

Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.

3it4

From Proteopedia

(Difference between revisions)

Jump to: navigation, search

Current revision

The Crystal Structure of Ornithine Acetyltransferase from Mycobacterium tuberculosis (Rv1653) at 1.7 A

Structural highlights

3it4 is a 4 chain structure with sequence from Mycobacterium tuberculosis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 1.7Å
Ligands:	, ,
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

ARGJ_MYCTU Catalyzes two activities which are involved in the cyclic version of arginine biosynthesis: the synthesis of N-acetylglutamate from glutamate and acetyl-CoA as the acetyl donor, and of ornithine by transacetylation between N(2)-acetylornithine and glutamate (By similarity).[HAMAP-Rule:MF_01106]

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 PubMed

Mycobacterium tuberculosis ornithine acetyltransferase (Mtb OAT; E.C. 2.3.1.35) is a key enzyme of the acetyl recycling pathway during arginine biosynthesis. It reversibly catalyzes the transfer of the acetyl group from N-acetylornithine (NAORN) to L-glutamate. Mtb OAT is a member of the N-terminal nucleophile fold family of enzymes. The crystal structures of Mtb OAT in native form and in its complex with ornithine (ORN) have been determined at 1.7 and 2.4 A resolutions, respectively. ORN is a competitive inhibitor of this enzyme against L-glutamate as substrate. Although the acyl-enzyme complex of Streptomyces clavuligerus ornithine acetyltransferase has been determined, ours is the first crystal structure to be reported of an ornithine acetyltransferase in complex with an inhibitor. ORN binding does not alter the structure of Mtb OAT globally. However, its presence stabilizes the three C-terminal residues that are disordered and not observed in the native structure. Also, stabilization of the C-terminal residues by ORN reduces the size of the active-site pocket volume in the structure of the ORN complex. The interactions of ORN and the protein residues of Mtb OAT unambiguously delineate the active-site residues of this enzyme in Mtb. Moreover, modeling studies carried out with NAORN based on the structure of the ORN-Mtb OAT complex reveal important interactions of the carbonyl oxygen of the acetyl group of NAORN with the main-chain nitrogen atom of Gly128 and with the side-chain oxygen of Thr127. These interactions likely help in the stabilization of oxyanion formation during enzymatic reaction and also will polarize the carbonyl carbon-oxygen bond, thereby enabling the side-chain atom O(gamma 1) of Thr200 to launch a nucleophilic attack on the carbonyl-carbon atom of the acetyl group of NAORN.

The molecular structure of ornithine acetyltransferase from Mycobacterium tuberculosis bound to ornithine, a competitive inhibitor.,Sankaranarayanan R, Cherney MM, Garen C, Garen G, Niu C, Yuan M, James MN J Mol Biol. 2010 Apr 9;397(4):979-90. Epub 2010 Feb 22. PMID:20184895^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Sankaranarayanan R, Cherney MM, Garen C, Garen G, Niu C, Yuan M, James MN. The molecular structure of ornithine acetyltransferase from Mycobacterium tuberculosis bound to ornithine, a competitive inhibitor. J Mol Biol. 2010 Apr 9;397(4):979-90. Epub 2010 Feb 22. PMID:20184895 doi:10.1016/j.jmb.2010.02.018

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/3it4"

@@ Line 3: / Line 3: @@
 <StructureSection load='3it4' size='340' side='right'caption='[[3it4]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[3it4]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/"bacillus_tuberculosis"_(zopf_1883)_klein_1884 "bacillus tuberculosis" (zopf 1883) klein 1884]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3IT4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3IT4 FirstGlance]. <br>
+<table><tr><td colspan='2'>[[3it4]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Mycobacterium_tuberculosis Mycobacterium tuberculosis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3IT4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3IT4 FirstGlance]. <br>
-</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=BEZ:BENZOIC+ACID'>BEZ</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene></td></tr>
+</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.7&#8491;</td></tr>
-<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">argJ, MT1691, MTCY06H11.18, Rv1653 ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1773 "Bacillus tuberculosis" (Zopf 1883) Klein 1884]), argJ, Rv1653, MT1691, MTCY06H11.18 ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1773 "Bacillus tuberculosis" (Zopf 1883) Klein 1884])</td></tr>
+<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=BEZ:BENZOIC+ACID'>BEZ</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene></td></tr>
-<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Glutamate_N-acetyltransferase Glutamate N-acetyltransferase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.3.1.35 2.3.1.35] </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=3it4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3it4 OCA], [https://pdbe.org/3it4 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3it4 RCSB], [https://www.ebi.ac.uk/pdbsum/3it4 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3it4 ProSAT]</span></td></tr>
 </table>
 == Function ==
-[[https://www.uniprot.org/uniprot/ARGJ_MYCTU ARGJ_MYCTU]] Catalyzes two activities which are involved in the cyclic version of arginine biosynthesis: the synthesis of N-acetylglutamate from glutamate and acetyl-CoA as the acetyl donor, and of ornithine by transacetylation between N(2)-acetylornithine and glutamate (By similarity).[HAMAP-Rule:MF_01106]
+[https://www.uniprot.org/uniprot/ARGJ_MYCTU ARGJ_MYCTU] Catalyzes two activities which are involved in the cyclic version of arginine biosynthesis: the synthesis of N-acetylglutamate from glutamate and acetyl-CoA as the acetyl donor, and of ornithine by transacetylation between N(2)-acetylornithine and glutamate (By similarity).[HAMAP-Rule:MF_01106]
 == Evolutionary Conservation ==
 [[Image:Consurf_key_small.gif|200px|right]]
@@ Line 34: / Line 33: @@
 __TOC__
 </StructureSection>
-[[Category: Glutamate N-acetyltransferase]]
 [[Category: Large Structures]]
-[[Category: Cherney, M M]]
-[[Category: Garen, C]]
-[[Category: Garen, G]]
-[[Category: James, M N]]
-[[Category: Sankaranarayanan, R]]
-[[Category: Structural genomic]]
-[[Category: Yuan, M]]
-[[Category: Acyltransferase]]
-[[Category: Amino-acid biosynthesis]]
-[[Category: Arginine biosynthesis]]
-[[Category: Cytoplasm]]
-[[Category: Multifunctional enzyme]]
 [[Category: Mycobacterium tuberculosis]]
-[[Category: Ornithine acetyltransferase]]
+[[Category: Cherney MM]]
-[[Category: Transferase]]
+[[Category: Garen C]]
+[[Category: Garen G]]
+[[Category: James MN]]
+[[Category: Sankaranarayanan R]]
+[[Category: Yuan M]]

3it4

From Proteopedia

Current revision

The Crystal Structure of Ornithine Acetyltransferase from Mycobacterium tuberculosis (Rv1653) at 1.7 A

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox