| cytosine | <biochemistry> Pyrimidine base found in DNA and RNA. Pairs with guanine. Glycosylated base is cytidine. (18 Nov 1997) |
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| cytosine arabinoside | A synthetic nucleoside used as an antimetabolite in the treatment of neoplasms. Incorrect term for arabinosylcytosine. (05 Mar 2000) |
| cytosine-DNA glycosidase | <enzyme> Acts on uv-irradiated DNA at modified cytosine residues which are not pyrimidine dimers Registry number: EC 3.2.2.- Synonym: cytosine-DNA glycosylase (26 Jun 1999) |
| cytosine ribonucleoside | <biochemistry> Nucleoside consisting of D ribose and the pyrimidine base cytosine. (18 Nov 1997) |
| cytosine-UDP-glucuronosyltransferase | <enzyme> Catalyses the formation of cytosylglucuronic acid from udp-glucuronic acid and cytosine in the formation of blasticidin s; isolated from streptomyces griseochromogenes Registry number: EC 2.4.1.- Synonym: cytosylglucuronic acid synthase, cga synthase (26 Jun 1999) |
| site-specific DNA methyltransferase (cytosine-specific) | <enzyme> An enzyme responsible for producing a species-characteristic methylation pattern on cytosine residues in a specific short base sequence in the host cell's DNA. The enzyme catalyses the methylation of DNA cytosine in the presence of s-adenosyl-l-methionine to form s-adenosyl-l-homocysteine and DNA containing 5-methylcytosine. Registry number: EC 2.1.1.73 (12 Dec 1998) |
| DNA (cytosine-5-)-methyltransferase | <enzyme> An enzyme that catalyses the transfer of a methyl group from s-adenosylmethionine to the 5-position of cytosine or to the 6-position in adenine in mammalian DNA. Chemical name: S-Adenosyl-L-methionine:DNA (cytosine-5-)-methyltransferase Registry number: EC 2.1.1.37 (12 Dec 1998) |