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Covalent modification of Escherichia coli ADPglucose synthetase with 8-azido substrate analogs


, : Covalent modification of Escherichia coli ADPglucose synthetase with 8-azido substrate analogs. Archives of Biochemistry and Biophysics 244(2): 585-595

Two photoaffinity labeling agents, 8-azido-ATP and 8-azido-ADPglucose, are substrate site specific probes of the Escherichia coli ADPglucose synthetase. In the presence of light (254 nm), the analogs specifically and covalently modify the enzyme with concomitant loss of catalytic activity. The substrate ADPglucose completely protects the enzyme from covalent modification by these 8-azido analogs. ATP, another substrate, also provides nearly 100% protection from 8-azido-ATP inactivation but is less efficient in protection of inactivation by 8-azido-ADPglucose. In the absence of light, however, ADPglucose synthetase can utilize either 8-azido-ATP or 8-azido-ADPglucose as substrates.

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Accession: 039703280

PMID: 3004345

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