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- W1982486955 abstract "It has been suggested that the lysine residue in the conserved K-T-G-G motif could be the substrate ADP-glucose binding site of Escherichia coli glycogen synthase (GS). Since the K-X-G-G motif is highly conserved between E. coli GS and all the maize starch synthase (SS) isozymes, it has become widely accepted that the lysine in the conserved K-T-G-G motif may also function as the ADPGlc binding site of maize SS. We have used chemical modification and site-directed mutagenesis to study the function of lysine residues in SS. Pyridoxal-5'-phosphate inactivated maize SSIIa activity in a time and concentration dependent manner. ADPGlc completely protected SSIIa from inactivation by pyridoxal-5'-phosphate, indicating that lysine residue(s) could be important for ADPGlc binding and enzyme catalysis. In contrast to E. coli GS, mutation of conserved lysine193 (K-T-G-G) in maize SS did not alter the ADPGlc binding while significantly changing the enzyme activity toward different primers. Our results suggest that lysine-193 (K-T-G-G) is not directly involved in ADPGlc binding, instead mutation in the conserved lysine position affected the primer preference." @default.
- W1982486955 created "2016-06-24" @default.
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- W1982486955 date "2004-07-01" @default.
- W1982486955 modified "2023-09-27" @default.
- W1982486955 title "Involvement of lysine-193 of the conserved “K-T-G-G” motif in the catalysis of maize starch synthase IIa" @default.
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- W1982486955 doi "https://doi.org/10.1016/j.abb.2004.01.010" @default.
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