Abstract

Two phosphoglycerate kinase enzymes have been purified from the hyperthermophilic eubacterium Thermotoga maritima. One has been shown to be monomeric with a MW of 41 kDa, whilst the other, in contrast to other phosphoglycerate kinases that have been studied, is seen to be tetrameric by gel filtration, with a subunit MW of 70 kDa by SDS PAGE. The tetrameric PGK is a fusion protein with triose phosphate isomerase and has been crystallised from ammonium sulphate in the presence of the triose sugar substrate 3-phosphoglycerate

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