Binding Studies on Rabbit‐Muscle Phosphoglucose Isomerase

Peter Bruch, Klaus D. Schnackerz, John M. Chirgwin, Ernst A. Noltmann

Research output: Contribution to journalArticle

6 Scopus citations


Binding studies utilizing the techniques of gel filtration, rate dialysis and equilibrium dialysis yielded a value of 2.0 binding sites per molecule for either substrate or inhibitors like 6‐phospho‐gluconate and pyridoxal 5′‐phosphate to rabbit muscle phosphoglucose isomerase, thereby establishing that the enzyme has one catalytic site per subunit. For the substrates and 6‐phospho‐gluconate studies were performed at various pH values. For 6‐phosphogluconate, the dissociation constant was found to change dramatically with increasing pH, following a pattern analogous to that deduced from catalytic rate measurements. For the catalytic equilibrium mixture of glucose 6‐phosphate and fructose 6‐phosphate, the Kd showed excellent agreement with the Km values reported earlier. The binding studies are discussed in relation to the current concept of the catalytic mechanism.

Original languageEnglish (US)
Pages (from-to)564-568
Number of pages5
JournalEuropean Journal of Biochemistry
Issue number2
StatePublished - Jul 1973
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry

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