Abstract
The function of the type II peptidyl carrier protein (PCP) ColA1a in collismycin (COL) biosynthesis was characterized in this study. ColA1a was involved in the selection and loading of picolinic acid (PA), instead of normal amino acid substrates, as the origin of ring B in COLs. The 2.1 Å crystal structure of ColA1a was solved. Primary and tertiary structural comparison of ColA1a with other PCPs revealed the structural basis for their typical α‐helical bundles. More details are discussed in the article by Ma et al. on page 963—969.image
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