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. 2001 Jul 15;357(Pt 2):581–586. doi: 10.1042/0264-6021:3570581

Sulphoacetaldehyde sulpho-lyase (EC 4.4.1.12) from Desulfonispora thiosulfatigenes: purification, properties and primary sequence.

K Denger 1, J Ruff 1, U Rein 1, A M Cook 1
PMCID: PMC1221989  PMID: 11439112

Abstract

The strictly anaerobic bacterium Desulfonispora thiosulfatigenes ferments taurine via sulphoacetaldehyde, which is hydrolysed to acetate and sulphite by sulphoacetaldehyde sulpho-lyase (EC 4.4.1.12). The lyase was expressed at high levels and a two-step, 4.5-fold purification yielded an apparently homogeneous soluble protein, which was presumably a homodimer in its native form; the molecular mass of the subunit was about 61 kDa (by SDS/PAGE). The mass was determined to be 63.8 kDa by matrix-assisted laser-desorption ionization-time-of-flight (MALDI-TOF) MS. The purified enzyme converted 1 mol of sulphoacetaldehyde to 1 mol each of sulphite and acetate, but no requirement for thiamine pyrophosphate (TPP) was detected. The N-terminal and two internal amino acid sequences were determined, which allowed us to generate PCR primers. The gene was amplified and sequenced. The DNA sequence had no significant homologue in the databases searched, whereas the derived amino acid sequence indicated an oxo-acid lyase, revealed a TPP-binding site and gave a derived molecular mass of 63.8 kDa.

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Selected References

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