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. 1984 Dec 1;3(12):2737–2743. doi: 10.1002/j.1460-2075.1984.tb02204.x

A site-specific mutation within the active site of ribulose-1,5-bisphosphate carboxylase of Rhodospirillum rubrum

S Gutteridge 1,1, I Sigal 1,2, B Thomas 1,3, R Arentzen 1, A Cordova 1, G Lorimer 1
PMCID: PMC557761  PMID: 16453576

Abstract

In vitro mutagenic techniques have generated an asp→glu substitution at residue 198 adjacent to the carbamate-divalent metal ion binding site of Rhodospirillum rubrum ribulose 1,5-bisphosphate carboxylase. A single C→A nucleotide change in the coding strand created the mutant and introduced a new EcoRI restriction site on the expression plasmid pRR2119. Although the carboxylase:oxygenase ratio remained the same, the mutant enzyme had slightly altered kinetic properties. The e.p.r. spectra of the quaternary complexes enzyme.activator carbamate.Mn2+.2-carboxyarabinitol 1,5-bisphosphate and enzyme.activator carbamate.Mn2+.4-carboxyarabinitol 1,5-bisphosphate for mutant and wild-type enzymes were different, indicating that the metal ion was in a slightly altered environment. These findings are consistent with the hypothesis that, besides the carbamate at lys 201, the carboxyl group of asp 198 contributes to the formation of the divalent metal ion binding site.

Keywords: active site, in vitro mutagenesis, site-specific mutation, ribulose bisphosphate carboxylase

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Selected References

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