cysteine - Definition. Was ist cysteine
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Was (wer) ist cysteine - definition

SULFUR-CONTAINING AMINO ACID
Cys; Cysteinyl; L-cysteine; L-cysteine hydrochloride; L-cysteine hydrochloride monohydrate; Cysteine hydrochloride; L-Cysteine; Cysteine endopeptidases; E910; E920; Cystein; C3H7NO2S; Cysteine biosynthetic pathway
  • (''R'')-Cysteine (left) and (''S'')-Cysteine (right) in zwitterionic form at neutral pH
  • Cysteine synthesis: [[Cystathionine beta synthase]] catalyzes the upper reaction and [[cystathionine gamma-lyase]] catalyzes the lower reaction.

cysteine         
['s?st?i:n, -t??n, -te?n, -ti:n]
¦ noun Biochemistry a sulphur-containing amino acid which occurs in keratins and other proteins.
Origin
C19: from cystine + -eine (var. of -ine4).
Cysteine-rich protein         
SMALL PROTEIN WITH HIGH NUMBER OF DISULPHIDE BONDS
Cysteine rich peptide; Cysteine-rich peptide; Cysteine rich protein; Disulpfide-rich protein; Disulpfide rich protein
Cysteine-rich proteins (also cysteine-rich peptide, CRP, disulphide-rich peptide) are small proteins that contain a large number of cysteines. These cysteines either cross-link to form disulphide bonds, or bind metal ions by chelation, stabilising the protein's tertiary structure.
Cysteine-S-conjugate beta-lyase         
CLASS OF ENZYMES
Cysteine-S-conjugate b-lyase; EC 4.4.1.13; L-cysteine-S-conjugate thiol-lyase (deaminating; pyruvate-forming)
In enzymology, a cysteine-S-conjugate beta-lyase () is an enzyme that catalyzes the chemical reaction

Wikipedia

Cysteine

Cysteine (symbol Cys or C; ) is a semiessential proteinogenic amino acid with the formula HOOC−CH(−NH2)−CH2−SH. The thiol side chain in cysteine often participates in enzymatic reactions as a nucleophile. Cysteine is chiral, only L-cysteine is found in nature.

The thiol is susceptible to oxidation to give the disulfide derivative cystine, which serves an important structural role in many proteins. In this case, the symbol Cyx is sometimes used. The deprotonated form can generally be described by the symbol Cym as well.

When used as a food additive, cysteine has the E number E920.

Cysteine is encoded by the codons UGU and UGC.

Beispiele aus Textkorpus für cysteine
1. And the amino acid cysteine, which is released from chicken during cooking, can thin mucus.
2. Eggs contain cysteine, which is used to make glutathione – a chemical that "mops up" poisonous free radicals.