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Chapter 25,612

Sulfhydryl Group of Muscle Phosphorylase

Kudo, A.; Shukuya, R.

Journal of Biochemistry 55: 254-259

1964

ISSN/ISBN: 0021-924X
PMID: 14162506
Accession: 025611505
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Sulfhydryl groups of phosphorylase a are classified into 2 types in their reactivity with p-chloromercuribenzoate; one reacts rapidly, the other slowly. Inhibition of phosphorylase a activity by p-chloromer-curibenzoate does not proceed similarly to the rate of mercaptide formation. N-ethyl maleimide binds with 4 of 18 sulfhydryl groups of phosphorylase a and does not affect the enzyme activity. Adenylic acid protects phosphorylase a from the inhibition by p-chloromercuri-benzoate. Adenylic acid and pyridoxal 5-phosphate are effective in preventing the inactivation of phosphorylase a by x-ray irradiation.

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Related References

Zarkadas, C.G.; Smillie, L.B.; Madsen, N.B. 1970: The sulfhydryl groups of muscle phosphorylase. V. the reactive sulfhydryl peptides Canadian Journal of Biochemistry 48(7): 763-776
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