Cysteine metabolism refers to the biological pathways that consume or create
cysteine
Cysteine (symbol Cys or C; ) is a semiessential proteinogenic amino acid with the formula . The thiol side chain in cysteine often participates in enzymatic reactions as a nucleophile.
When present as a deprotonated catalytic residue, s ...
. The pathways of different amino acids and other metabolites interweave and overlap to creating complex systems.cysteine is metabolism creating complex systems
Human cysteine metabolism
In human cysteine metabolism,
L-cysteine is consumed in several ways as shown below.
L-Cysteine is also consumed in
methionine and
glutathione metabolism as well as
pantothenate/
coenzyme A biosynthesis.
L-Cysteine is the product of several processes as well. In addition to the reactions below,
L-cysteine is also a product of
glycine
Glycine (symbol Gly or G; ) is an amino acid that has a single hydrogen atom as its side chain. It is the simplest stable amino acid ( carbamic acid is unstable), with the chemical formula NH2‐ CH2‐ COOH. Glycine is one of the proteinog ...
,
serine, and
threonine metabolism.
See also
*
D-cysteine desulfhydrase
*
Sulfur metabolism
Sulfur is metabolized by all organisms, from bacteria and archaea to plants and animals. Sulfur is reduced or oxidized by organisms in a variety of forms. The element is present in proteins, sulfate esters of polysaccharides, steroids, pheno ...
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Sulfur metabolism
Sulfur amino acids