Alonso MD, Lomako J, Lomako WM, Whelan WJ. Tyrosine-194 of glycogenin undergoes autocatalytic glucosylation but is not essential for catalytic function and activity.
FEBS Lett 1994;
342:38-42. [PMID:
8143846 DOI:
10.1016/0014-5793(94)80580-6]
[Citation(s) in RCA: 28] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Glycogenin is the protein primer for glycogen synthesis. By autocatalytic transglucosylation from UDPglucose, it creates a malto-octaose chain attached to its Tyr-194. It has been uncertain whether the autocatalysis includes the addition of the first glucose residue to Tyr-194. We now show this to be the case. However, we also demonstrate, contrary to a claim by others, that Tyr-194 is not necessary for the catalytic function and activity of glycogenin.
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