Abstract
High resolution studies on the crystal structure of glycogen phosphorylase b have identified the catalytic site to which the substrate glucose-1-phosphate binds strongly with some local conformational changes. The site is situated 8 Å (phosphate-to-phosphate distance) from pyridoxal phosphate, an essential cofactor of all glycogen phosphorylases. The catalytic site is 33 Å from the site in the N-terminal portion of the molecule to which adenine nucleotides bind. In contrast to phosphorylase a (the active form of the enzyme which is phosphorylated at Ser 14), the positions of the first 19 residues of phosphorylase b are not well defined.
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Weber, I., Johnson, L., Wilson, K. et al. Crystallographic studies on the activity of glycogen phosphorylase b. Nature 274, 433–437 (1978). https://doi.org/10.1038/274433a0
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DOI: https://doi.org/10.1038/274433a0
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