ribosomal neutral proteinase |
<enzyme> Ribosomal serine proteinase from rat liver ribosomes in cryptic form Registry number: EC 3.4.21.52 Synonym: cathepsin r (26 Jun 1999) |
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ribosomal protein |
<protein> Proteins present within the ribosomal subunits. In prokaryotes there are 31 proteins in the large subunit and 21 in the small subunit. Eukaryotic subunits have 50 (large subunit) and 33 (small subunit) proteins. (18 Nov 1997) |
ribosomal protein s6 kinase |
<enzyme> A protein serine/threonine kinase which is involved in cell transformation by polyoma virus and is connected to the expression of igf2. The immunosuppressant rapamycin inhibits the activation of the kinase, leading to reduced translation of certain mRNAs and a decrease in protein synthesis. Registry number: EC 2.7.10.- (12 Dec 1998) |
ribosomal protein S6 kinase kinase |
<enzyme> Isolated from unfertilised xenopus eggs; a 41 kD enzyme that is associated, in vivo, with phosphorylation on threonine and tyrosine residues and, in vitro, with phosphorylation on serine as well Registry number: EC 2.7.1.- Synonym: rsk kinase (26 Jun 1999) |
ribosomal proteins |
Proteins found in ribosomes. They are believed to have a catalytic function in reconstituting biologically active ribosomal subunits. (12 Dec 1998) |
ribosomal RNA |
<molecular biology> A nucleic acid found in all living cells. Plays a role in transferring information from DNA to the protein-forming system of the cell. (16 Dec 1997) |
ribosome |
<cell biology> A small particulate organelle found in prokaryotes and eukaryotes and also within mitochondria and chloroplasts, but differing in size and composition. Made of two subunits, each being an RNA protein complex. Ribosomes are responsible for the translation of mRNA which may occur in the cytoplasm (see polyribosomes) or on rough endoplasmic reticulum. Origin: Gr. Soma = body (18 Nov 1997) |
ribosome binding site |
The region of a messenger RNA molecule that binds the ribosome to initiate translation. (09 Oct 1997) |
ribosome-lamella complex |
A cylindrical cytoplasmic inclusion composed of concentrically arranged sheets of membranes alternating with rows of ribosomes; characteristic of the hairy cell in leukaemic reticuloendotheliosis. (05 Mar 2000) |
ribosomes |
Small cellular components composed of specialised ribosomal RNA and ribonucleic acid (RNA). (09 Oct 1997) |
ribostamycin |
<chemical> O-2,6-diamino-2,6-dideoxy-alpha-d-glucopyranosyl-(1,4)-o- (beta-d-ribofuranosyl-(1,5))-2-deoxy-d-streptamine. A broad-spectrum antimicrobial isolated from streptomyces ribosifidicus. Pharmacological action: antibiotics, aminoglycoside. Chemical name: D-Streptamine, O-2,6-diamino-2,6-dideoxy-alpha-D-glucopyranosyl-(1-4)-O-(beta-D-ribofuranosyl-(1-5))-2-deoxy- (12 Dec 1998) |
ribostamycin 3'-O-phosphotransferase |
<enzyme> From streptomyces ribosidificus; base sequence of its gene siven in first source Registry number: EC 2.7.1.- Synonym: ribostamycin phosphotransferase (26 Jun 1999) |
ribosuria |
The enhanced urinary excretion of d-ribose; commonly one manifestation of muscular dystrophy. Origin: ribose + G. Ouron, urine (05 Mar 2000) |
ribosyl |
The radical formed by loss of the hemiacetal OH group from either of the two cyclic forms of ribose (yielding ribofuranosyl and ribopyranosyl compounds), by combination with an H of an -NH-or a -CH-group; the natural nucleosides are ribosyl compounds, not ribosides, as the bond between ribose and aglycon is C-N or C-C, not -C-O-X-. (05 Mar 2000) |
ribosylation |
The covalent attachment of one or more ribosyl groups to a molecule (usually a macromolecule). (05 Mar 2000) |