1dpb

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(Difference between revisions)

Revision as of 04:13, 30 August 2017

CRYSTALLOGRAPHIC AND ENZYMATIC INVESTIGATIONS ON THE ROLE OF SER558, HIS610 AND ASN614 IN THE CATALYTIC MECHANISM OF AZOTOBACTER VINELANDII DIHYDROLIPOAMIDE ACETYLTRANSFERASE (E2P)

Structural highlights

1dpb is a 1 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Activity:	Dihydrolipoyllysine-residue acetyltransferase, with EC number 2.3.1.12
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[ODP2_AZOVI] The pyruvate dehydrogenase complex catalyzes the overall conversion of pyruvate to acetyl-CoA and CO(2). It contains multiple copies of three enzymatic components: pyruvate dehydrogenase (E1), dihydrolipoamide acetyltransferase (E2) and lipoamide dehydrogenase (E3).

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

Dihydrolipoamide acetyltransferase (E2p) is the structural and catalytic core of the pyruvate dehydrogenase multienzyme complex. In Azotobacter vinelandii E2p, residues Ser558, His610', and Asn614' are potentially involved in transition state stabilization, proton transfer, and activation of proton transfer, respectively. Three active site mutants, S558A, H610C, and N614D, of the catalytic domain of A. vinelandii E2p were prepared by site-directed mutagenesis and enzymatically characterized. The crystal structures of the three mutants have been determined at 2.7, 2.5, and 2.6 A resolution, respectively. The S558A and H610C mutants exhibit a strongly (200-fold and 500-fold, respectively) reduced enzymatic activity whereas the substitution of Asn614' by aspartate results in a moderate (9-fold) reduced activity. The decrease in enzymatic activity of the S558A and H610C mutants is solely due to the absence of the hydroxyl and imidazole side chains, respectively, and not due to major conformational rearrangements of the protein. Furthermore the sulfhydryl group of Cys610' is reoriented, resulting in a completely buried side chain which is quite different from the solvent-exposed imidazole group of His610' in the wild-type enzyme. The presence of Asn614' in A. vinelandii E2p is exceptional since all other 18 known dihydrolipoamide acyltransferase sequences contain an aspartate in this position. We observe no difference in conformation of Asp614' in the N614D mutant structure compared with the conformation of Asn614' in the wild-type enzyme. Detailed analysis of all available structures and sequences suggests two classes of acetyltransferases: one class with a catalytically essential His-Asn pair and one with a His-Asp-Arg triad as present in chloramphenicol acetyltransferase [Leslie, A. G. W. (1990) J. Mol. Biol. 213, 167-186] and in the proposed active site models of Escherichia coli and yeast E2p.

Crystallographic and enzymatic investigations on the role of Ser558, His610, and Asn614 in the catalytic mechanism of Azotobacter vinelandii dihydrolipoamide acetyltransferase (E2p).,Hendle J, Mattevi A, Westphal AH, Spee J, de Kok A, Teplyakov A, Hol WG Biochemistry. 1995 Apr 4;34(13):4287-98. PMID:7703242^[1]

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

References

↑ Hendle J, Mattevi A, Westphal AH, Spee J, de Kok A, Teplyakov A, Hol WG. Crystallographic and enzymatic investigations on the role of Ser558, His610, and Asn614 in the catalytic mechanism of Azotobacter vinelandii dihydrolipoamide acetyltransferase (E2p). Biochemistry. 1995 Apr 4;34(13):4287-98. PMID:7703242

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/1dpb"

Categories: Dihydrolipoyllysine-residue acetyltransferase | Hendle, J | Hol, W G.J | Dihydrolipoamide acetyltransferase

@@ Line 1: / Line 1: @@
 ==CRYSTALLOGRAPHIC AND ENZYMATIC INVESTIGATIONS ON THE ROLE OF SER558, HIS610 AND ASN614 IN THE CATALYTIC MECHANISM OF AZOTOBACTER VINELANDII DIHYDROLIPOAMIDE ACETYLTRANSFERASE (E2P)==
 <StructureSection load='1dpb' size='340' side='right' caption='[[1dpb]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[1dpb]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_478 Atcc 478]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1DPB OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1DPB FirstGlance]. <br>
+<table><tr><td colspan='2'>[[1dpb]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1DPB OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1DPB FirstGlance]. <br>
 </td></tr><tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Dihydrolipoyllysine-residue_acetyltransferase Dihydrolipoyllysine-residue acetyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.3.1.12 2.3.1.12] </span></td></tr>
-<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1dpb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1dpb OCA], [http://pdbe.org/1dpb PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1dpb RCSB], [http://www.ebi.ac.uk/pdbsum/1dpb PDBsum]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1dpb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1dpb OCA], [http://pdbe.org/1dpb PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1dpb RCSB], [http://www.ebi.ac.uk/pdbsum/1dpb PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1dpb ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 16: / Line 17: @@
     <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/chain_selection.php?pdb_ID=2ata ConSurf].
+</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=1dpb ConSurf].
 <div style="clear:both"></div>
 <div style="background-color:#fffaf0;">
@@ Line 31: / Line 32: @@
 __TOC__
 </StructureSection>
-[[Category: Atcc 478]]
 [[Category: Dihydrolipoyllysine-residue acetyltransferase]]
 [[Category: Hendle, J]]
 [[Category: Hol, W G.J]]
 [[Category: Dihydrolipoamide acetyltransferase]]

1dpb

From Proteopedia

Revision as of 04:13, 30 August 2017

CRYSTALLOGRAPHIC AND ENZYMATIC INVESTIGATIONS ON THE ROLE OF SER558, HIS610 AND ASN614 IN THE CATALYTIC MECHANISM OF AZOTOBACTER VINELANDII DIHYDROLIPOAMIDE ACETYLTRANSFERASE (E2P)

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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