| gamma-tocopherol methyltransferase | <enzyme> Forms alpha-tocopherol; enzyme nomenclature name of tocopherol o-methyltransferase is incorrect, since there are no -och3 groups in the product Registry number: EC 2.1.1.95 Synonym: gtc methyltransferase (26 Jun 1999) |
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| gamma-tolerance | The tolerance of a person or a piece of equipment to forces that develop as a result of acceleration or deceleration. (05 Mar 2000) |
| gamma toxin | <microbiology> Complex toxin (33.4 kD) produced by Staphylococcus aureus. Rabbit erythrocytes are particularly sensitive to lysis by the toxin, but the mechanism is unknown. (18 Nov 1997) |
| gene rearrangement, gamma-chain T-cell antigen receptor | Ordered rearrangement of T-cell variable gene regions coding for the gamma-chain of antigen receptors. (12 Dec 1998) |
| genes, T-cell receptor gamma | DNA sequences encoding the gamma chain of the T-cell receptor. The human gamma-chain locus is organised similarly to the tcr beta-chain locus. (12 Dec 1998) |
| receptors, antigen, T-cell, gamma-delta | T-cell receptors composed of CD3-associated gamma and delta polypeptide chains and expressed primarily in CD4-/CD8- T-cells. The receptors appear to be preferentially located in epithelial sites and probably play a role in the recognition of bacterial antigens. The T-cell receptor gamma/delta chains are separate and not related to the gamma and delta chains which are subunits of CD3 (see antigens, CD3). (12 Dec 1998) |
| glutamate gamma-saemialdehyde | -OOCCH(NH3)+CH2CH2C HO;an intermediate in l-proline and l-ornithine metabolism; becomes elevated in type II hyperprolinaemia. (05 Mar 2000) |
| motor neurons, gamma | Motor neurons which activate the contractile regions of intrafusal muscle fibres, thus adjusting the sensitivity of the muscle spindles to stretch. Gamma motor neurons may be "static" or "dynamic" according to which aspect of responsiveness (or which fibre types) they regulate. The alpha and gamma motor neurons are often activated together (alpha gamma coactivation) which allows the spindles to contribute to the control of movement trajectories despite changes in muscle length. (12 Dec 1998) |
| poly(gamma-glutamic acid) | A polypeptide formed of glutamic acid residues, the gamma-carboxyl group of one glutamic acid being condensed to the amino group of its neighbor; occurs naturally in the anthrax bacillus capsule. (05 Mar 2000) |
| polymerase gamma | A class of mammalian DNA polymerases in the mitochondria responsible for replication of the mitochondrial genome. Synonym: polymerase g. (05 Mar 2000) |
| cystathionine gamma-lyase | <enzyme> A multifunctional pyridoxal phosphate enzyme. In the final step in the biosynthesis of cysteine it catalyses the cleavage of cystathionine to yield cysteine, ammonia, and 2-ketobutyrate. Chemical name: L-Cystathionine cysteine-lyase (deaminating) Registry number: EC 4.4.1.1 (12 Dec 1998) |
| cystathionine gamma-synthase | o-succinylhomoserine (thiol)-lyase |
| protein-glutamine gamma-glutamyltransferase | <enzyme> An enzyme that catalyses the reaction of protein glutamine and an alkylamine to yield protein n(5)-alkylglutamine and ammonia. The gamma-carboxamide groups of peptide-bound glutamine residues act as acyl donors, and the 6-amino groups of protein- and peptide-bound lysine residues act as acceptors, to give intra- and inter-molecular n(6)-(5-glutamyl)lysine crosslinks. In the epidermis these cross-linked proteins are involved in the formation of the cornified envelope of the stratum corneum cells. In the plasma, the transglutaminase is called factor xiiia, the activated form of factor xiii. The crosslinking results in the stabilization of the fibrin clot. Pharmacological action: coagulants. Chemical name: Protein-glutamine:amine gamma-glutamyltransferase Registry number: EC 2.3.2.13 (12 Dec 1998) |
| homocysteine cystathionine gamma-synthase | <enzyme> Homocysteine and cystein yield cystathionine and h2s Registry number: EC 4.4.- Synonym: hccg-s (26 Jun 1999) |
| human gamma globulin | A preparation of the proteins of liquid human plasma, containing the antibodies of normal adults; it is obtained from pooled liquid human plasma from a number of donors and may be prepared by precipitation with organic solvents under controlled conditions of pH, ionic strength, and temperature. Synonym: human normal immunoglobulin. (05 Mar 2000) |