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The thermostability of the α-carbonic anhydrase from the thermophilic bacterium T. ammonificans is shown to depend on the formation of intrasubunit disulfide bonds and a unique intersubunit disulfide/lysine core at the centre of the tetrameric molecule. Unlike most α-carbonic anhydrases, this enzyme does not show esterase activity towards p-nitrophenyl acetate, which is proposed to be owing to its increased structural rigidity.
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