Ray M, Bhaduri A. Uridine-diphosphate-glucose 4-epimerase from Saccharomyces fragilis. Inactivation by heat and reconstitution of the inactive enzyme.
EUROPEAN JOURNAL OF BIOCHEMISTRY 1976;
70:319-23. [PMID:
188643 DOI:
10.1111/j.1432-1033.1976.tb11020.x]
[Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
UDP-glucose 4-epimerase from Saccharomyces fragilis is rapidly inactivated by heating at 42 degrees C for 7 min and at 45 degrees C for 4 min. The effector site, specific for sugar phosphates, is destroyed still earlier. The enzyme is inactivated by the dissocation of NAD from it leaving the dimeric structure unaffected. It can be reactivated by mercaptoethanol and NAD, both of which are essential for reactivation, and NAD becomes associated with the dimeric protein moiety.
Collapse