| lysophospholipase | <enzyme> An enzyme that catalyses the hydrolysis of a single fatty acid ester bond in lysoglycerophosphatidates with the formation of glyceryl phosphatidates and a fatty acid. Chemical name: 2-Lysophosphatidylcholine acylhydrolase Registry number: EC 3.1.1.5 (12 Dec 1998) |
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| lysophospholipase-transacylase | <chemical> Synonym: lysophosphatidylcholine lysophosphatidylcholine transacylase, lpta-i, lpta-ii (26 Jun 1999) |
| lysophospholipids | Derivatives of phosphoglycerols which have only one of the alcohol groups of the glycerol backbone ester-linked with a fatty acid. (12 Dec 1998) |
| lysosogenic bacteriophage | <virology> Bacteriophage that can take part in a lysogenic or lytic cycle in its bacterial host. See: lysogeny. (15 Oct 1997) |
| lysosomal disease | A disease due to inadequate functioning of a lysosomal enzyme; most such disease's are associated with a storage disease. (05 Mar 2000) |
| lysosomal diseases | Diseases (also called storage diseases) in which a deficiency of a particular lysosomal enzyme leads to accumulation of the undigested substrate for that enzyme within cells. Not immediately fatal, but within a few years lead to serious neurological and skeletal disorders and eventually to death. See: the following conditions: Hurler sundrome, Hunter syndrome, San Fillipo, Gaucher's disease, Niemann-Pick, Pompe's disease, Tay Sachs disease. (18 Nov 1997) |
| lysosomal enzyme | <biochemistry> A range of degradative enzymes, most of which operate best at acid pH. The best known marker enzymes are acid phosphatase and glucuronidase, but many others are known. (18 Nov 1997) |
| lysosomal storage diseases | Inborn errors of metabolism characterised by defects in specific lysosomal hydrolases and resulting in intracellular accumulation of unmetabolised substrates. (12 Dec 1998) |
| lysosome | <cell biology> Membrane bounded cytoplasmic organelle containing a variety of hydrolytic enzymes that can be released into a phagosome or to the exterior. Release of lysosomal enzymes in a dead cell leads to autolysis (and is the reason for hanging game, to tenderise the muscle), but it is misleading to refer to lysosomes as suicide bags, since this is certainly not their normal function. Part of the GERL complex or trans Golgi network. Origin: Gr. Soma = body (18 Nov 1997) |
| lysosome associated membrane glycoprotein | <protein> Lysosome specific integral membrane glycoproteins. Long luminal domain, short transmembrane domain, very short cytoplasmic tail. Function not yet clear. (18 Nov 1997) |
| lysosome phagosome fusion | <cell biology> A process that occurs after the internalisation of a primary phagosome. Fusion of the membranes leads to the release of lysosomal enzymes into the phagosome. Some species of intracellular parasite evade immune responses by interfering with this process. (18 Nov 1997) |
| lysosomes | A class of morphologically heterogeneous cytoplasmic particles in animal and plant tissues characterised by their content of hydrolytic enzymes and the structure-linked latency of these enzymes. The intracellular functions of lysosomes depend on their lytic potential. The single unit membrane of the lysosome acts as a barrier between the enzymes enclosed in the lysosome and the external substrate. The activity of the enzymes contained in lysosomes is limited or nil unless the vesicle in which they are enclosed is ruptured. Such rupture is supposed to be under metabolic (hormonal) control. (12 Dec 1998) |
| lysostaphin | <enzyme> A mixture of three different proteolytic enzymes, two of which lyse bacterial walls. It is obtained from staphylococcus staphylolyticus (s. Epidermidis). Lysostaphin is very antigenic, but has been used in animals and topically in man against certain infections. Pharmacological action: antibiotics, peptide, anti-infective agents, local. Registry number: EC 3.4.- (12 Dec 1998) |
| lysostaphin endopeptidase | <enzyme> Glycylglycine endopeptidase Registry number: EC 3.4.- (26 Jun 1999) |
| lysotype | A type within a bacterial species determined by its reaction to specific phages. Origin: Lyso + type (05 Mar 2000) |