cysteine


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Related to cysteine: methionine, cytosine

cysteine

 [sis-te´ēn]
a sulfur-containing amino acid, one of the nonessential amino acids, produced by enzymatic or acid hydrolysis of proteins; it is readily oxidized to cystine and is sometimes found in urine.

cys·te·ine (C, Cys),

(sis-tē'in), Do not confuse this word with cystine.
l-isomer of this acid is found in most proteins; especially abundant in keratin.

cysteine

(sĭs′tə-ēn′, -ĭn, -tē-)
n.
An amino acid, C3H7O2NS, derived from cystine and found in most proteins.

cys·te·ine

(C, Cys) (sis-tē'in)
An amino acid found in most proteins; especially abundant in keratin.

cysteine

An AMINO ACID present in most body proteins.
Cysteineclick for a larger image
Fig. 125 Cysteine . Molecular structure.

cysteine (C, Cys)

one of 20 AMINO ACIDS common in proteins that has a polar ‘R’ structure and is water-soluble. See Fig. 125 . The R group contains a sulphydryl (SH) group which is vital for the formation of DISULPHIDE BRIDGES in proteins. Disulphide bridges hold polypeptides together and give stability, especially in molecules such as KERATIN and IMMUNOGLOBULINS. The ISOELECTRIC POINT of cysteine is 5.1.

cys·te·ine

(C) (sis-tē'in) Do not confuse this word with cystine.
l-isomer of this acid is found in most proteins; especially abundant in keratin.
References in periodicals archive ?
Similarly, cysteine with Lipoid S 75 was entrapped in unsaturated soybean lecithin with an encapsulation efficiency of 89.8%.
There was an effect (P<0.01) for body weight gain as the dietary methionine + cysteine:lysine ratio increased, based on linear (BWG = -3.046+39.577X; [R.sup.2] = 0.85), quadratic (BWG = -99.642+314.404X-193.54X2; [R.sup.2] = 0.92), and LRP adjustments [BWG=27.575-61.798 (0.728-X); [R.sup.2] = 0.87].
(v) The brass electrode was immersed for a certain time, 15, 30, 60, 1200, and 4080 min, in 1 x [10.sup.-3] M SDS and then rinsed with distilled water and transferred into 0.05M HCl + 1 x [10 .sup.-2] M cysteine solution in which cyclic voltammetry was performed.
Ganapasam, "S-Allyl cysteine alleviates inflammation by modulating the expression of NF-[kappa]B during chromium (VI)-induced hepatotoxicity in rats," Human & Experimental Toxicology, vol.
Kubatiev, "Capillary electrophoresis coupled with 1,1'-thiocarbonyldiimidazole derivatization for the rapid detection of total homocysteine and cysteine in human plasma," Journal of Chromatography B, vol.
Also the last member of the D2 receptor family, D4 receptor, is palmitoylated on its terminal cysteine residue Cys467.
The cholesterol binding sites of PFO lies in its conserved cysteine residue, sandwiched between a b-sheet and Trp 467 [25, 26].
In our understanding, the steric hindrance from the incoming substrate amino group of cysteine pushed away the Schiff-base linkage amino group of Lys216 without tilting the PLP pyridine ring due to the tight binding.
The RASIG, GO, and SGO groups had significantly higher mean uric acid, cysteine, and [alpha]-tocopherol and lower lycopene compared to the reference group.
Allicin from garlic can be used as a neuroprotective strategy for ischemic stroke [96]; however S-propargylcysteine and S-methyl cysteine were the effective neuroprotective agents [27,128].
Two catalytic classes of digestive peptidases have been reported; cysteine peptidases, three isocathepsin L <<CatL>> (Laycock et al.