National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM141799
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM136039
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM129541
米国
National Science Foundation (NSF, United States)
DGE-1656518
米国
引用
ジャーナル: Nat Chem Biol / 年: 2025 タイトル: Structural basis for intermodular communication in assembly-line polyketide biosynthesis. 著者: Dillon P Cogan / Alexander M Soohoo / Muyuan Chen / Yan Liu / Krystal L Brodsky / Chaitan Khosla / 要旨: Assembly-line polyketide synthases (PKSs) are modular multi-enzyme systems with considerable potential for genetic reprogramming. Understanding how they selectively transport biosynthetic ...Assembly-line polyketide synthases (PKSs) are modular multi-enzyme systems with considerable potential for genetic reprogramming. Understanding how they selectively transport biosynthetic intermediates along a defined sequence of active sites could be harnessed to rationally alter PKS product structures. To investigate functional interactions between PKS catalytic and substrate acyl carrier protein (ACP) domains, we employed a bifunctional reagent to crosslink transient domain-domain interfaces of a prototypical assembly line, the 6-deoxyerythronolide B synthase, and resolved their structures by single-particle cryogenic electron microscopy (cryo-EM). Together with statistical per-particle image analysis of cryo-EM data, we uncovered interactions between ketosynthase (KS) and ACP domains that discriminate between intra-modular and inter-modular communication while reinforcing the relevance of conformational asymmetry during the catalytic cycle. Our findings provide a foundation for the structure-based design of hybrid PKSs comprising biosynthetic modules from different naturally occurring assembly lines.