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pubmed-article:12200542pubmed:abstractTextThe molecular basis of chain length specificity of Candida rugosa lipase 1 was investigated by molecular modeling and site-directed mutagenesis. The synthetic lip1 gene and the lipase mutants were expressed in Pichia pastoris and assayed for their chain length specificity in single substrate assays using triglycerides as well as in a competitive substrate assay using a randomized oil. Mutation of amino acids at different locations inside the tunnel (P246F, L413F, L410W, L410F/S300E, L410F/S365L) resulted in mutants with a different chain length specificity. Mutants P246F and L413F have a strong preference for short chain lengths whereas substrates longer than C10 are hardly hydrolyzed. Increasing the bulkiness of the amino acid at position 410 led to mutants that show a strong discrimination of chain lengths longer than C14. The results obtained can be explained by a simple mechanical model: the activity for a fatty acid sharply decreases as it becomes long enough to reach the mutated site. In contrast, a mutation at the entrance of the tunnel (L304F) has a strong impact on C4 and C6 substrates. This mutant is nevertheless capable of hydrolyzing chain lengths longer than C8.lld:pubmed
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pubmed-article:12200542pubmed:pagination595-601lld:pubmed
pubmed-article:12200542pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:12200542pubmed:articleTitleBlocking the tunnel: engineering of Candida rugosa lipase mutants with short chain length specificity.lld:pubmed
pubmed-article:12200542pubmed:affiliationInstitute of Technical Biology, University of Stuttgart, Allmandring 31, D-70569 Stuttgart, Germany.lld:pubmed
pubmed-article:12200542pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:12200542pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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