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. 2003 Jun 1;372(Pt 2):577–585. doi: 10.1042/BJ20021377

Thermotoga neapolitana adenylate kinase is highly active at 30 degrees C.

Claire Vieille 1, Harini Krishnamurthy 1, Hyung-Hwan Hyun 1, Alexei Savchenko 1, Honggao Yan 1, J Gregory Zeikus 1
PMCID: PMC1223421  PMID: 12625835

Abstract

The adenylate kinase (AK) gene from Thermotoga neapolitana, a hyperthermophilic bacterium, was cloned and overexpressed in Escherichia coli, and the recombinant enzyme was biochemically characterized. The T. neapolitana AK (TNAK) sequence indicates that this enzyme belongs to the long bacterial AKs. TNAK contains the four cysteine residues that bind Zn(2+) in all Gram-positive AKs and in a few other Zn(2+)-containing bacterial AKs. Atomic emission spectroscopy and titration data indicate a content of 1 mol of Zn(2+)/mol of recombinant TNAK. The EDTA-treated enzyme has a melting temperature (T (m)=93.5 degrees C) 6.2 degrees C below that of the holoenzyme (99.7 degrees C), identifying Zn(2+) as a stabilizing feature in TNAK. TNAK is a monomeric enzyme with a molecular mass of approx. 25 kDa. TNAK displays V (max) and K (m) values at 30 degrees C identical with those of the E. coli AK at 30 degrees C, and displays very high activity at 80 degrees C, with a specific activity above 8000 units/mg. The unusually high activity of TNAK at 30 degrees C makes it an interesting model to test the role of enzyme flexibility in activity.

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Selected References

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