3e1h
Crystal structure of a type III polyketide synthase PKSIIINc from Neurospora crassaCrystal structure of a type III polyketide synthase PKSIIINc from Neurospora crassa
Structural highlights
FunctionEvolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedMicrobial type III polyketide synthases (PKSs) have revealed remarkable mechanistic as well as functional versatility. Recently, a type III PKS homolog from Azotobacter has been implicated in the biosynthesis of resorcinolic lipids, thus adding a new functional significance to this class of proteins. Here, we report the structural and mutational investigations of a novel type III PKS protein from Neurospora crassa involved in the biosynthesis of resorcinolic metabolites by utilizing long chain fatty acyl-CoAs. The structure revealed a long hydrophobic tunnel responsible for its fatty acyl chain length specificity resembling that of PKS18, a mycobacterial type III PKS. Structure-based mutational studies to block the tunnel not only altered the fatty acyl chain specificity but also resulted in change of cyclization pattern affecting the product profile. This first structural characterization of a resorcinolic lipid synthase provides insights into the coordinated functioning of cyclization and a substrate-binding pocket, which shows mechanistic intricacy underlying type III PKS catalysis. Structural insights into biosynthesis of resorcinolic lipids by a type III polyketide synthase in Neurospora crassa.,Goyal A, Saxena P, Rahman A, Singh PK, Kasbekar DP, Gokhale RS, Sankaranarayanan R J Struct Biol. 2008 Jun;162(3):411-21. Epub 2008 Mar 30. PMID:18462950[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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