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. 1994 Jul;60(7):2501–2507. doi: 10.1128/aem.60.7.2501-2507.1994

Structural and functional analysis of pyruvate kinase from Corynebacterium glutamicum.

M S Jetten 1, M E Gubler 1, S H Lee 1, A J Sinskey 1
PMCID: PMC201676  PMID: 8074528

Abstract

Pyruvate kinase activity is an important element in the flux control of the intermediate metabolism. The purified enzyme from Corynebacterium glutamicum demonstrated a marked sigmoidal dependence of the initial rate on the phosphoenolpyruvate concentration. In the presence of the negative allosteric effector ATP, the phosphoenolpyruvate concentration at the half-maximum rate (S0.5) increased from 1.2 to 2.8 mM, and cooperation, as expressed by the Hill coefficient, increased from 2.0 to 3.2. AMP promoted opposite effects: the S0.5 was decreased to 0.4 mM, and the enzyme exhibited almost no cooperation. The maximum reaction rate was 702 U/mg, which corresponded to an apparent kcat of 2,540 s-1. The enzyme was not influenced by fructose-1,6-diphosphate and used Mn2+ or Co2+ as cations. Sequence determination of the C. glutamicum pyk gene revealed an open reading frame coding for a polypeptide of 475 amino acids. From this information and the molecular mass of the native protein, it follows that the pyruvate kinase is a tetramer of 236 kDa. Comparison of the deduced polypeptide sequence with the sequences of other bacterial pyruvate kinases showed 39 to 44% homology, with some regions being very strongly conserved.

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Selected References

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