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1.
Commun Biol ; 7(1): 92, 2024 01 12.
Artículo en Inglés | MEDLINE | ID: mdl-38216676

RESUMEN

Acyl carrier protein (ACP) is the work horse of polyketide (PKS) and fatty acid synthases (FAS) and acts as a substrate shuttling domain in these mega enzymes. In fungi, FAS forms a 2.6 MDa symmetric assembly with six identical copies of FAS1 and FAS2 polypeptides. However, ACP spatial distribution is not restricted by symmetry owing to the long and flexible loops that tether the shuttling domain to its corresponding FAS2 polypeptide. This symmetry breaking has hampered experimental investigation of substrate shuttling route in fungal FAS. Here, we develop a protein engineering and expression method to isolate asymmetric fungal FAS proteins containing odd numbers of ACP domains. Electron cryomicroscopy (cryoEM) observation of the engineered complex reveals a non-uniform distribution of the substrate shuttling domain relative to its corresponding FAS2 polypeptide at 2.9 Å resolution. This work lays the methodological foundation for experimental study of ACP shuttling route in fungi.


Asunto(s)
Proteína Transportadora de Acilo , Saccharomyces cerevisiae , Animales , Caballos , Proteína Transportadora de Acilo/química , Saccharomyces cerevisiae/metabolismo , Ácido Graso Sintasas/genética , Ácido Graso Sintasas/química , Proteínas Fúngicas/metabolismo , Péptidos/metabolismo
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