Abstract
Carrier proteins, 80-100 residues in length, serve as information-rich platforms to present growing acyl and peptidyl chains as covalently tethered phosphopantetheinyl-thioester intermediates during the biosynthesis of fatty acid, polyketide, and nonribosomal natural products. Carrier proteins are recognized both in cis and in trans by partner catalytic domains that effect chain-elongating condensations, redox adjustments, other tailoring steps, and finally kinetically controlled disconnection and release of the mature natural product. Dissection of regions of carrier proteins that are specifically recognized by upstream and downstream catalytic partner proteins is deciphering the logic for multiprotein assembly line construction of these large classes of natural products.
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