cysteine

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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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

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.
Farlex Partner Medical Dictionary © Farlex 2012

cysteine

(sĭs′tə-ēn′, -ĭn, -tē-)
n.
An amino acid, C3H7O2NS, derived from cystine and found in most proteins.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

cys·te·ine

(C, Cys) (sis-tē'in)
An amino acid found in most proteins; especially abundant in keratin.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

cysteine

An AMINO ACID present in most body proteins.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
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.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

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.
Medical Dictionary for the Dental Professions © Farlex 2012