6bqc
From Proteopedia
Cyclopropane fatty acid synthase from E. coli
Structural highlights
FunctionCFA_ECOLI Transfers a methylene group from S-adenosyl-L-methionine to the cis double bond of an unsaturated fatty acid chain resulting in the replacement of the double bond with a methylene bridge. Publication Abstract from PubMedCell membranes must adapt to different environments. In Gram-negative bacteria, the inner membrane can be remodeled directly by modification of lipids embedded in the bilayer. For example, when Escherichia coli enters stationary phase, cyclopropane fatty acid (CFA) synthase converts most double bonds in unsaturated inner-membrane lipids into cyclopropyl groups. Here we report the crystal structure of E. coli CFA synthase. The enzyme is a dimer in the crystal and in solution, with each subunit containing a smaller N-domain that associates tightly with a larger catalytic C-domain, even following cleavage of the inter-domain linker or co-expression of each individual domain. Efficient catalysis requires dimerization and proper linkage of the two domains. These findings support an avidity-based model in which one subunit of the dimer stabilizes membrane binding, while the other subunit carries out catalysis. Structural and Functional Analysis of E. coli Cyclopropane Fatty Acid Synthase.,Hari SB, Grant RA, Sauer RT Structure. 2018 Jul 4. pii: S0969-2126(18)30214-4. doi:, 10.1016/j.str.2018.06.008. PMID:30057024[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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