Potato and rabbit muscle phosphorylases: comparative studies on the structure, function and regulation of regulatory and nonregulatory enzymes.

Abstract:

:Phosphorylases (EC 2.4.1.1) from potato and rabbit muscle are similar in many of their structural and kinetic properties, despite differences in regulation of their enzyme activity. Rabbit muscle phosphorylase is subject to both allosteric and covalent controls, while potato phosphorylase is an active species without any regulatory mechanism. Both phosphorylases are composed of subunits of approximately 100 000 molecular weight, and contain a firmly bound pyridoxal 5'-phosphate. Their actions follow a rapid equilibrium random Bi Bi mechanism. From the sequence comparison between the two phosphorylases, high homologies of widely distributed regions have been found, suggesting that they may have evolved from the same ancestral protein. By contrast, the sequences of the N-terminal region are remarkably different from each other. Since this region of the muscle enzyme forms the phosphorylatable and AMP-binding sites as well as the subunit-subunit contact region, these results provide the structural basis for the difference in the regulatory properties between potato and rabbit muscle phosphorylases. Judged from CD spectra, the surface structures of the potato enzyme might be significantly different from that of the muscle enzyme. Indeed, the subunit-subunit interaction in the potato enzyme is tighter than that in the muscle enzyme, and the susceptibility of the two enzymes toward modification reagents and proteolytic enzymes are different. Despite these differences, the structural and functional features of the cofactor, pyridoxal phosphate, site are surprisingly well conserved in these phosphorylases. X-ray crystallographic studies on rabbit muscle phosphorylase have shown that glucose-1-phosphate and orthophosphate bind to a common region close to the 5'-phosphate of the cofactor. The muscle enzyme has a glycogen storage site for binding of the enzyme to saccharide substrate, which is located away from the cofactor site. We have obtained, in our reconstitution studies, evidence for binding of saccharide directly to the cofactor site of potato phosphorylase. This difference in the topography of the functional sites explains the previously known different specificities for saccharide substrates in the two phosphorylases. Based on a combination of these and other studies, it is now clear that the 5'-phosphate group of pyridoxal phosphate plays a direct role in the catalysis of this enzyme. Information now available on the reaction mechanism of phosphorylase is briefly described.

journal_name

Mol Cell Biochem

authors

Fukui T,Shimomura S,Nakano K

doi

10.1007/BF00238507

subject

Has Abstract

pub_date

1982-02-19 00:00:00

pages

129-44

issue

3

eissn

0300-8177

issn

1573-4919

journal_volume

42

pub_type

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