4q24 | pdb_00004q24
Crystal structure of Cyclo(L-leucyl-L-phenylalanyl) synthase
Structural highlights
FunctionCLPS_STRNR Involved in the biosynthesis of albonoursin (cyclo[(alpha,beta-dehydro-Phe)-(alpha,beta-dehydro-Leu)]), an antibacterial peptide. It uses activated amino acids in the form of aminoacyl-tRNAs (aa-tRNAs) as substrates to catalyze the ATP-independent formation of cyclodipeptides which are intermediates in diketopiperazine (DKP) biosynthetic pathways. Catalyzes the formation of cyclo(L-Phe-L-Leu) (cFL) as major products from L-L-phenylalanyl-tRNA(Phe) and L-leucyl-tRNA(Leu). AlbC can also incorporate various nonpolar residues, such as L-phenylalanine, L-leucine, L-tyrosine and L-methionine, and to a much lesser extent L-alanine and L-valine, into cyclodipeptides. Indeed, ten possible cyclodipeptides composed of L-phenylalanine, L-leucine, L-tyrosine and L-methionine are all synthesized to detectable amounts by AlbC.[1] [2] Publication Abstract from PubMedCyclodipeptide synthases form cyclodipeptides from two aminoacyl transfer RNAs. They use a ping-pong mechanism that begins with transfer of the aminoacyl moiety of the first aminoacyl tRNA onto a conserved serine, yielding an aminoacyl enzyme. Combining X-ray crystallography, site-directed mutagenesis and affinity labelling of the cyclodipeptide synthase AlbC, we demonstrate that the covalent intermediate reacts with the aminoacyl moiety of the second aminoacyl tRNA, forming a dipeptidyl enzyme, and identify the aminoacyl-binding sites of the aminoacyl tRNAs. Unravelling the mechanism of non-ribosomal peptide synthesis by cyclodipeptide synthases.,Moutiez M, Schmitt E, Seguin J, Thai R, Favry E, Belin P, Mechulam Y, Gondry M Nat Commun. 2014 Oct 6;5:5141. doi: 10.1038/ncomms6141. PMID:25284085[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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