Steric occlusion regulates proximal interactions of acyl carrier protein domain in fungal fatty acid synthase
| Autor: | Mohammad T. Mazhab-Jafari, Jennifer W. Lou |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Fatty Acid Synthases Protein domain Medicine (miscellaneous) Multienzyme complexes Reaction intermediate Saccharomyces cerevisiae Reductase General Biochemistry Genetics and Molecular Biology Article 03 medical and health sciences 0302 clinical medicine Protein Domains Cryoelectron microscopy Catalytic Domain Acyl Carrier Protein lcsh:QH301-705.5 biology Chemistry Fatty acid synthase Acyl carrier protein 030104 developmental biology lcsh:Biology (General) Dehydration reaction Biochemistry Dehydratase Enzyme mechanisms biology.protein General Agricultural and Biological Sciences 030217 neurology & neurosurgery |
| Zdroj: | Communications Biology Communications Biology, Vol 3, Iss 1, Pp 1-9 (2020) |
| ISSN: | 2399-3642 |
| Popis: | The acyl carrier protein (ACP) domain shuttles substrates and reaction intermediates in type I fungal fatty acid synthases via transient protein-protein interactions. Here, using electron cryo-microscopy (cryoEM), we report the structure of a fungal FAS stalled at the dehydration reaction, which precedes the final enoyl reduction in the fatty acid biosynthesis cycle. This conformation revealed multiple contact sites between ACP and the dehydratase (DH) and enoyl reductase (ER) domains that occluded the ACP binding to the adjacent ER domain. Our data suggests a minimal path from the DH to the ER reaction site that requires minute changes in the coordinates of the structured N- and C- termini of the ACP domain. Lou and Mazhab-Jafari report the structure of a fungal fatty acid synthase stalled at the dehydration reaction, which precedes the final enoyl reduction in the fatty acid biosynthesis cycle. This study suggests that the binding of acyl carrier protein domain to its proximal dehydratase and enoyl reductase domains in fatty acid synthase is mutually exclusive. |
| Databáze: | OpenAIRE |
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