cysteine

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Related to L-cysteine: L-cysteine hydrochloride

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 ?
Siven, "Permeability and toxicity characteristics of L-cysteine and 2-methyl-thiazolidine-4-carboxylic acid in Caco-2 cells," Pharmaceutical Development and Technology, vol.
For the trials to obtain reaction-intermediate structures, crystal I was transferred into the solution of crystal I condition supplemented with 5 mM L-cysteine and 1 mM PLP for various durations.
In most of the reactions p- benzoquinone and cystine/cysteic acid have been reported to be the main oxidation products for hydroquinone and L-cysteine respectively [5 6].
PIC1 and L-cysteine both demonstrated a dose-dependent and similar inhibition of peroxidase activity (Figure 4(a)).
Jain, "L-cysteine and hydrogen sulfide increase PIP3 and AMPK/PPARgamma expression and decrease ROS and vascular inflammation markers in high glucose treated human U937 monocytes," Journal of Cellular Biochemistry, vol.
Figure 1 shows the X-ray diffraction pattern of nanoparticles, microflowers composed with flakes, and microspheres composed with tiny nanoparticles at the above prepared conditions using precursor zinc nitrate hexahydrate, octa decylamine (C[H.sub.3][(C[H.sub.2]).sub.17]N[H.sub.2]), (+) L-cysteine, hexamethylenetetramine (HMT), and sodium hydroxide (NaOH).
Functional components in garlic of antidiabetes included S-methyl L-cysteine, S-allyl cysteine, diallyl disulphide, and S-allyl-mercapto-captopril; nevertheless, major functional components in onion of antidiabetes contained S-methylcysteine and flavonoids (see Table 1).
Through microbial fermentation L-cysteine has been developed which is more economical and is safe for environment.
We noted the absence of L-cysteine and sugar in the new bun in comparison with the original.
For reduction of the enzymatic browning, loss of nutritional quality, and maturation of plant tissues several additives may be applied, such as citric acid, ascorbic acid, calcium chloride and L-cysteine chloride (MANOLOPOULOU; VARZAKAS, 2011, GHIDELLI et al., 2013).