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. 1966 Sep;100(3):702–710. doi: 10.1042/bj1000702

The active centre of triose phosphate isomerase

Pamela M Burton 1, S G Waley 1
PMCID: PMC1265204  PMID: 5969283

Abstract

The molecular weight and amino acid composition of triose phosphate isomerase have been determined. The molecular weight (43000) is lower and the molecular activity (500000) higher than those of most other glycolytic enzymes. Reaction with iodoacetate (studied with radioactive reagent) takes place in two phases: in the first phase, at pH6·3, cysteine and methionine groups react and enzymic activity is unimpaired; in the second phase, histidine reacts and enzymic activity is lost. Photo-oxidation leads to inactivation, with loss of cysteine, of histidine and of tryptophan, but little loss of tyrosine. The mechanism postulated for the action of the enzyme demands the intervention of a group functioning as a base, and the results obtained are consistent with histidine's being the basic group in the active centre.

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Selected References

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