4.4.1.25: L-cysteate sulfo-lyase

This is an abbreviated version!
For detailed information about L-cysteate sulfo-lyase, go to the full flat file.

Reaction

Synonyms

(S)-cysteate sulfo-lyase, CuyA, cysteate sulfo-lyase, L-cysteate sulpho-lyase (deaminating)

ECTree

4 Lyases

4.4 Carbon-sulfur lyases

4.4.1 Carbon-sulfur lyases (only sub-subclass identified to date)

4.4.1.25 L-cysteate sulfo-lyase

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Results	in table
186	AA Sequence
1	Cofactor
1	General Information
1	General Stability
1	KM Value [mM]
3	Molecular Weight [Da]
5	Natural Substrates/ Products (Substrates)
6	Organism
5	Pathway
1	pH Optimum
3	Purification (Commentary)
4	Reaction
1	Reaction Type
6	Reference
1	Source Tissue
3	Specific Activity [micromol/min/mg]
1	Storage Stability
11	Substrates and Products (Substrate)
1	Subunits
6	Synonyms
1	Systematic Name

Systematic Name

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Systematic Name on EC 4.4.1.25 - L-cysteate sulfo-lyase

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L-cysteate bisulfite-lyase (deaminating; pyruvate-forming)

A pyridoxal-phosphate protein. The enzyme cleaves a carbon-sulfur bond, releasing hydrogensulfite and an unstable enamine product that tautomerizes to an imine form, which undergoes a hydrolytic deamination to form pyruvate and ammonia. The latter reaction, which can occur spontaneously, can also be catalysed by EC 3.5.99.10, 2-iminobutanoate/2-iminopropanoate deaminase. D-Cysteine can also act as a substrate, but more slowly. It is converted into hydrogen sulfide, pyruvate, and ammonia. This inducible enzyme from the marine bacterium Silicibacter pomeroyi DSS-3 forms part of the cysteate-degradation pathway.