What is it about?
Elaiophylin glycosyltransferase (ElaGT) has been identified as the enzyme responsible for the symmetric glycosylation of Ela, a unique 16-membered symmetric macrodiolide antibiotic. However, the symmetric catalytic mechanism is still unclear in GT. We have shown here that two molecules of ElaGT can form a symmetric homodimer with a continuous acceptor-binding pocket to bind one Ela. ElaGT may utilize this arrangement to allosterically regulate the catalytic center. Interestingly, this dimer interface resembles that of activator-dependent GT.
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Why is it important?
Our structures present a novel self-activating model of GT1 that binds the symmetric substrate, which will help us understand the catalytic mechanism of symmetric sugar-transferring and the activator-dependent GTs. Additionally, we provide a new potential regulation site for substrate specificity.
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This page is a summary of: Substrate-induced dimerization of elaiophylin glycosyltransferase reveals a novel self-activating form of glycosyltransferase for symmetric glycosylation, Acta Crystallographica Section D Structural Biology, September 2022, International Union of Crystallography, DOI: 10.1107/s2059798322008658.
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