The catalytic bimodality of mammalian phosphoglycerate mutase.

Rabbit muscle phosphoglycerate mutase, presumed to manifest an absolute cofactor requirement for activity, has been found to express catalysis (3 +/- 1% of optimum) in the absence of added D-glycerate-2,3-P2. Isotope experiments indicate that this catalysis proceeds through a binary phosphoryl enzyme-glycerate intermediate which dissociates into free enzyme and monophosphoglycerate. 32P-Labeled phosphoglycerate mutase is formed by reaction with either D-32P-glycerate-3-P or D-U32P-glycerate-2,3-P2. In each case, the acid lability and alkali stability of the covalent adduct, phosphoenzyme, is consistent with a phosphohistidyl residue having been formed within the active site. D-[U-14C]Glycerate reacts with phosphoenzyme to generate D-[U-14C]monophosphoglycerate which, in turn, can react further with phosphoenzyme to yield D-[U-14C]glycerate-2,3-P2. The pH profile for the cofactor-independent activity exhibits an optimum at 6.0 as opposed to 7.0 when D-glycerate-2,3-P2 is present in the reaction medium. Bisubstrate kinetics (pH 7.0, 23 degrees C) with D-glycerate-3-P concentration as the variable, yields a family of reciprocal plots which is in accord with a modified ping-pong mechanism when D-glycerate-2,3-P2 concentrations are greater than 10(-1) Km (where Km = 0.33 microM). Progressively diminishing concentrations (much less than Km) of D-glycerate-2,3-P2 produce curvilinear reciprocal plots that approach linearity as a limit in accordance with single substrate kinetics.

• Publication year

  1986

• Venue

  Journal of Biological Chemistry

• Publication date

  1986-09-25

• Fields of study

  Biology, Medicine, Chemistry

• Identifiers
  DOI 10.1016/s0021-9258(18)67150-9PMID 3017986
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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