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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Characterization of SyrC, an Aminoacyltransferase Shuttling Threonyl and Chlorothreonyl Residues in the Syringomycin Biosynthetic Assembly Line.

Syringomycin, a lipopeptidolactone assembled from nine amino acid monomers by four enzymes, SyrB1, SyrB2, SyrC, and SyrE, is a cyclic nonribosomal peptide made by plant-associated Pseudomonas spp. This assembly is unusual because the terminal residue, 4-chlorothreonine, has been proposed to be added in trans since the ninth module of the megasynthetase SyrE lacks an adenylation domain required for Thr/Cl-Thr activation. SyrC is now identified as a Thr/Cl-Thr aminoacyltransferase, shuttling the Thr/Cl-Thr moiety between the pantetheinyl arms of the thiolation domain of SyrB1 and the thiolation domain in module nine of SyrE. SyrC uses Cys224 as a catalytic nucleophile to generate a Thr/Cl-Thr-S-enzyme intermediate during transfer. SyrC joins a growing family of such aminoacyl-shuttling enzymes that also use covalent catalysis to move aminoacyl groups from carrier proteins during coumermycin and coronamic acid biosynthesis.[1]

References

  1. Characterization of SyrC, an Aminoacyltransferase Shuttling Threonyl and Chlorothreonyl Residues in the Syringomycin Biosynthetic Assembly Line. Singh, G.M., Vaillancourt, F.H., Yin, J., Walsh, C.T. Chem. Biol. (2007) [Pubmed]
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