1ssm
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Serine Acetyltransferase- Apoenzyme (truncated)
OverviewOverview
Serine acetyltransferase (SAT, EC 2.3.1.30) catalyzes the CoA-dependent, acetylation of the side chain hydroxyl group of l-serine to form, O-acetylserine, as the first step of a two-step biosynthetic pathway in, bacteria and plants leading to the formation of l-cysteine. This reaction, represents a key metabolic point of regulation for the cysteine, biosynthetic pathway due to its feedback inhibition by cysteine. We have, determined the X-ray crystal structure of Haemophilus influenzae SAT in, complexes with CoA and its cysteine feedback inhibitor. The enzyme is a, 175 kDa hexamer displaying the characteristic left-handed parallel, beta-helix (LbetaH) structural domain of the hexapeptide acyltransferase, superfamily of enzymes. Cysteine is bound in a crevice between adjacent, LbetaH domains and underneath a loop excluded from the coiled LbetaH. The, proximity of its thiol group to the thiol group of CoA derived from, superimposed models of the cysteine and CoA complexes confirms that, cysteine is bound at the active site. Analysis of the contacts of SAT with, cysteine and CoA and the conformational differences that distinguish these, complexes provides a structural basis for cysteine feedback inhibition, which invokes competition between cysteine and serine binding and a, cysteine-induced conformational change of the C-terminal segment of the, enzyme that excludes binding of the cofactor.
About this StructureAbout this Structure
1SSM is a Single protein structure of sequence from Haemophilus influenzae. Active as Serine O-acetyltransferase, with EC number 2.3.1.30 Full crystallographic information is available from OCA.
ReferenceReference
Structure of serine acetyltransferase in complexes with CoA and its cysteine feedback inhibitor., Olsen LR, Huang B, Vetting MW, Roderick SL, Biochemistry. 2004 May 25;43(20):6013-9. PMID:15147185
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