| cysteine carboxypeptidase | <enzyme> An enzyme which removes the last peptide bond on a protein (the one at the carboxyl end). Its active site contains the sulphur part of the amino acid cysteine. (09 Oct 1997) |
|---|---|
| cysteine conjugate S-oxidase | <enzyme> Converts s-benzyl-l-cysteine to s-benzyl-l-cysteine sulfoxide; uses o2 and NADPH; may be a flavin-containing monooxygenase Registry number: EC 1.13.12- (26 Jun 1999) |
| cysteine conjugate transaminase | <enzyme> Generates thiopyruvates by deamination of cysteine conjugates leaving the r-s-c bond intact Registry number: EC 2.6.1.- Synonym: cysteine-conjugate alpha-ketoglutarate transaminase (26 Jun 1999) |
| cysteine desulfhydrase | <enzyme> A multifunctional pyridoxal phosphate enzyme. In the final step in the biosynthesis of cysteine it catalyses the cleavage of cystathionine to yield cysteine, ammonia, and 2-ketobutyrate. Chemical name: L-Cystathionine cysteine-lyase (deaminating) Registry number: EC 4.4.1.1 (12 Dec 1998) |
| cysteine desulfurase | <enzyme> Pyridoxal phosphate enzyme which catalyses the formation of l-alanine and elemental sulfur from cysteine; required for full activation of the metalloproteins of azotobacter vinelandii nitrogenase Registry number: EC 4.4.1.- Synonym: nifs gene product, azotobacter, nifs protein, azotobacter (26 Jun 1999) |
| cysteine proteinase | <enzyme> An enzyme that destroys proteins by hydrolysis, turning them back into individual amino acids. (09 Oct 1997) |
| cysteine proteinase inhibitors | Exogenous and endogenous compounds which inhibit cysteine proteinases. (12 Dec 1998) |
| cysteine proteinases | <enzyme> Peptide hydrolases which have a cysteine involved in the catalytic process. This group of enzymes is inactivated by sulfhydryl reagents. Registry number: EC 3.4.22 (12 Dec 1998) |
| cysteine S-conjugate N-acetyltransferase | <enzyme> Catalyses n-acetylation of l-cysteine thioesters to form mercapturic acids; important in drug detoxication Registry number: EC 2.3.1.80 Synonym: cscn acetyltransferase (26 Jun 1999) |
| cysteine string protein | <protein> (CSPs) Peripheral membrane proteins that contain more than 10 palmitoylated cysteines and a DNA J homology domain. Nature 375:647 (18 Nov 1997) |
| cysteine sulfinate desulfinase | <enzyme> Catalyses removal of elemental sulfur and selenium atoms from cysteine, cystine, selenocysteine and selenocystine to produce l-alanine. Registry number: EC 4.4.1.- (26 Jun 1999) |
| cysteine sulfinic acid | -O2S-CH2CH (NH3)+COO-;a natural oxidation product of cysteine; an intermediate in the formation of taurine (via cysteic acid). (05 Mar 2000) |
| cysteine synthase | <enzyme> An enzyme that catalyses the biosynthesis of cysteine in microorganisms and plants from o-acetyl-l-serine and hydrogen sulfide. Chemical name: O(3)-Acetyl-L-serine acetate-lyase (adding hydrogen sulfide) Registry number: EC 4.2.99.8 (12 Dec 1998) |
| procollagen peptidase | <enzyme> The proteases that remove the terminal extension peptides of procollagen, deficiency of these enzymes leads to dermatosparaxis or Ehlers Danlos syndrome. (18 Nov 1997) |
| pyroglutamyl-peptidase I | <enzyme> An enzyme that catalyses the release of a n-terminal pyroglutamyl group from a polypeptide provided the next residue is not proline. It is inhibited by thiol-blocking reagents and occurs in mammalian tissues, microorganisms, and plants. Registry number: EC 3.4.19.3 (12 Dec 1998) |