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1mkb

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Revision as of 03:05, 25 December 2014

ESCHERICHIA COLI BETA-HYDROXYDECANOYL THIOL ESTER DEHYDRASE AT PH 5 AND 21 DEGREES C

Structural highlights

1mkb is a 2 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Gene:	FABA (Escherichia coli)
Activity:	[acyl-carrier-protein_dehydratase 3-hydroxydecanoyl-[acyl-carrier-protein] dehydratase], with EC number 4.2.1.60
Resources:	FirstGlance, OCA, RCSB, PDBsum

Function

[FABA_ECOLI] Necessary for the introduction of cis unsaturation into fatty acids. Catalyzes the dehydration of (3R)-3-hydroxydecanoyl-ACP to E-(2)-decenoyl-ACP and then its isomerization to Z-(3)-decenoyl-ACP. Can catalyze the dehydratase reaction for beta-hydroxyacyl-ACPs with saturated chain lengths up to 16:0, being most active on intermediate chain length. Is inactive in the dehydration of long chain unsaturated beta-hydroxyacyl-ACP.^[1]

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

BACKGROUND. Escherichia coli beta-hydroxydecanoyl thiol ester dehydrase (dehydrase) is essential to the biosynthesis of unsaturated fatty acids, by shunting a 10-carbon intermediate from the saturated fatty acid pathway into the unsaturated fatty acid pathway. Dehydrase catalyzes reactions of dehydration and of double-bond isomerization on 10-carbon thiol esters of acyl carrier protein (ACP). The aim of this work is to elucidate mechanisms for the two enzymatic reactions, which occur in an unusual bifunctional active site, and to understand the specificity of the enzyme for substrates with 10-carbon fatty acyl chains. RESULTS. Crystal structures at 2.0 A resolution for free dehydrase and for the enzyme modified by its classic, mechanism-based inactivator, 3-decynoyl-N-acetylcysteamine, have been determined. Dehydrase is a symmetric dimer with an unusual alpha+beta 'hot dog' fold. Each of the two independent active sites is located between the two subunits of the enzyme, and is a tunnel-shaped pocket completely isolated from the general solvent. Side chains of histidine from one subunit and aspartic acid from the other are the only potentially reactive protein groups in the active site. CONCLUSION. A two-base mechanism by which the histidine and aspartic acid together catalyze dehydration and isomerization reactions is consistent with the active-site structure. The unique topology of the protein fold and the identification of the active-site components reveal features of predictive value for another enzyme, FabZ, which may be the non-specific dehydratase involved in elongation of fatty acyl chains. A positively charged area surrounding the entrance to the active site, which could interact with the negatively charged ACP, was also found.

Structure of a dehydratase-isomerase from the bacterial pathway for biosynthesis of unsaturated fatty acids: two catalytic activities in one active site.,Leesong M, Henderson BS, Gillig JR, Schwab JM, Smith JL Structure. 1996 Mar 15;4(3):253-64. PMID:8805534^[2]

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

References

↑ Heath RJ, Rock CO. Roles of the FabA and FabZ beta-hydroxyacyl-acyl carrier protein dehydratases in Escherichia coli fatty acid biosynthesis. J Biol Chem. 1996 Nov 1;271(44):27795-801. PMID:8910376
↑ Leesong M, Henderson BS, Gillig JR, Schwab JM, Smith JL. Structure of a dehydratase-isomerase from the bacterial pathway for biosynthesis of unsaturated fatty acids: two catalytic activities in one active site. Structure. 1996 Mar 15;4(3):253-64. PMID:8805534

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

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1mkb"

Categories: Escherichia coli | Leesong, M | Fatty acid biosynthesis

@@ Line 3: / Line 3: @@
 == Structural highlights ==
 <table><tr><td colspan='2'>[[1mkb]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MKB OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1MKB FirstGlance]. <br>
-</td></tr><tr><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">FABA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli])</td></tr>
+</td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">FABA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli])</td></tr>
-<tr><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/3-hydroxydecanoyl-[acyl-carrier-protein]_dehydratase 3-hydroxydecanoyl-[acyl-carrier-protein] dehydratase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.2.1.60 4.2.1.60] </span></td></tr>
+<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/3-hydroxydecanoyl-[acyl-carrier-protein]_dehydratase 3-hydroxydecanoyl-[acyl-carrier-protein] dehydratase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.2.1.60 4.2.1.60] </span></td></tr>
-<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=1mkb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mkb OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1mkb RCSB], [http://www.ebi.ac.uk/pdbsum/1mkb 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=1mkb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mkb OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1mkb RCSB], [http://www.ebi.ac.uk/pdbsum/1mkb PDBsum]</span></td></tr>
-<table>
+</table>
+== Function ==
+[[http://www.uniprot.org/uniprot/FABA_ECOLI FABA_ECOLI]] Necessary for the introduction of cis unsaturation into fatty acids. Catalyzes the dehydration of (3R)-3-hydroxydecanoyl-ACP to E-(2)-decenoyl-ACP and then its isomerization to Z-(3)-decenoyl-ACP. Can catalyze the dehydratase reaction for beta-hydroxyacyl-ACPs with saturated chain lengths up to 16:0, being most active on intermediate chain length. Is inactive in the dehydration of long chain unsaturated beta-hydroxyacyl-ACP.<ref>PMID:8910376</ref>
 == Evolutionary Conservation ==
 [[Image:Consurf_key_small.gif|200px|right]]
@@ Line 33: / Line 35: @@
 </StructureSection>
 [[Category: Escherichia coli]]
-[[Category: Leesong, M.]]
+[[Category: Leesong, M]]
 [[Category: Fatty acid biosynthesis]]

1mkb

From Proteopedia

Revision as of 03:05, 25 December 2014

ESCHERICHIA COLI BETA-HYDROXYDECANOYL THIOL ESTER DEHYDRASE AT PH 5 AND 21 DEGREES C

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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