Please use this identifier to cite or link to this item: https://doi.org/10.1073/pnas.0601924103
Title: The 2.7-Å crystal structure of a 194-kDa homodimeric fragment of the 6-deoxyerythronolide B synthase
Authors: Tang, Y.
Kim, C.-Y. 
Mathews, I.I.
Cane, D.E.
Khosla, C.
Keywords: Modular megasynthase
Multienzyme assembly
Polyketide synthase
Issue Date: 25-Jul-2006
Citation: Tang, Y., Kim, C.-Y., Mathews, I.I., Cane, D.E., Khosla, C. (2006-07-25). The 2.7-Å crystal structure of a 194-kDa homodimeric fragment of the 6-deoxyerythronolide B synthase. Proceedings of the National Academy of Sciences of the United States of America 103 (30) : 11124-11129. ScholarBank@NUS Repository. https://doi.org/10.1073/pnas.0601924103
Abstract: The x-ray crystal structure of a 194-kDa fragment from module 5 of the 6-deoxyerythronolide B synthase has been solved at 2.7 Å resolution. Each subunit of the homodimeric protein contains a full-length ketosynthase (KS) and acyl transferase (AT) domain as well as three flanking "linkers." The linkers are structurally well defined and contribute extensively to intersubunit or interdomain interactions, frequently by means of multiple highly conserved residues. The crystal structure also reveals that the active site residue Cys-199 of the KS domain is separated from the active site residue Ser-642 of the AT domain by ≈80 Å. This distance is too large to be covered simply by alternative positioning of a statically anchored, fully extended phosphopantetheine arm of the acyl carrier protein domain from module 5. Thus, substantial domain reorganization appears necessary for the acyl carrier protein to interact successively with both the AT and the KS domains of this prototypical polyketide synthase module. The 2.7-Å KS-AT structure is fully consistent with a recently reported lower resolution, 4.5-Å model of fatty acid synthase structure, and emphasizes the close biochemical and structural similarity between polyketide synthase and fatty acid synthase enzymology. © 2006 by The National Academy of Sciences of the USA.
Source Title: Proceedings of the National Academy of Sciences of the United States of America
URI: http://scholarbank.nus.edu.sg/handle/10635/101848
ISSN: 00278424
DOI: 10.1073/pnas.0601924103
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