The malonyl transferase activity of type II polyketide synthase acyl carrier proteins
- PMID: 16793516
- DOI: 10.1016/j.chembiol.2006.03.010
The malonyl transferase activity of type II polyketide synthase acyl carrier proteins
Abstract
Acyl carrier proteins (ACPs) play a fundamental role in directing intermediates among the enzyme active sites of fatty acid and polyketide synthases (PKSs). In this paper, we demonstrate that the Streptomyces coelicolor (S. coelicolor) actinorhodin (act) PKS ACP can catalyze transfer of malonate to type II S. coelicolor fatty acid synthase (FAS) and other PKS ACPs in vitro. The reciprocal transfer from S. coelicolor FAS ACP to a PKS ACP was not observed. Several mutations in both act ACP and S. coelicolor FAS ACP could be classified by their participation in either donation or acceptance of this malonyl group. These mutations indicated that self-malonylation and malonyl transfer could be completely decoupled, implying that they were separate processes and that a FAS ACP could be converted from a non-malonyl-transferring protein to one with malonyl transferase activity.
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