| chlorophyll synthetase | <enzyme> Incorporates geranylgeraniol into chlorophyll; requires ATP; as of 11/80 not clear whether this is a synthetase or a combination of a kinase and a transferase Registry number: EC 6.1.- (26 Jun 1999) |
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| chlorophyll | The photosynthetic pigments of higher plants, but closely related to bacteriochlorophylls. Magnesium complexes of tetrapyrolles. (18 Nov 1997) |
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| chlorophyll a | Magnesium(II) pheophytinate a [(pheophytina to a)magnesium(II)];the major pigment found in all oxygen-evolving photosynthetic organisms (higher plants, and red and green algae). (05 Mar 2000) |
| chlorophyll b | (CH3 at 7 replaced by CHO in the chlorophyll structure), magnesium(II) pheophytinate b [(pheophytinato b) magnesium(II)]; the chlorophyll generally characteristic of higher plants (including the Chlorophyta, Euglenaphyta, and green algae). Absent in other types of algae. (05 Mar 2000) |
| chlorophyll b reductase | <enzyme> Reduces the 7-formyl group of chlorophyll b to the 7'-hydroxy compound; requires NADPH or NADH; NADPH is more effective Registry number: EC 1.1.1.- Synonym: chlorophyllide b reductase (26 Jun 1999) |
| chlorophyll c | The chlorophyll present in brown algae, diatoms, and flagellates. Two variants are known: c 1, in which two hydrogens are lost from C-17 and C-18, thus resembling phytoporphyrin, and the side chain at C-17 becomes an acrylic residue, -CH==CH2COOH; c2, in which the same changes are noted, but two more hydrogens are lost from the ethyl group at C-8, making this a vinyl residue like that at C-3. The two compounds can thus be named in terms of phytoporphyrin: magnesium 31,32,171,172-tetradehydro-132-(methoxycarbonyl)phytoporphyrinate and magnesium 31,32,81,82,171,172-hexadehydro-132-(methoxycarbonyl)phytoporphyrinate. Synonym: chlorofucin. (05 Mar 2000) |
| chlorophyll d | -CH==CH2 replaced by -CO-CH3 in the chlorophyll structure;the chlorophyll found in red algae (Rhodophyceae), together with chlorophyll a. (05 Mar 2000) |
| chlorophyll esterase | A reversible hydrolyzing enzyme catalyzing the removal of the phytyl group from a chlorophyll, leaving a chlorophyllide. Synonym: chlorophyll esterase. (05 Mar 2000) |
| chlorophyll unit | The number of chlorophyll molecules required to reduce one molecule of carbon dioxide by photosynthesis. (05 Mar 2000) |
| water-soluble chlorophyll derivatives | The copper complex of sodium and/or potassium salts of saponified chlorophyll, used topically for deodorization of chronic lesions and to promote wound repair. (05 Mar 2000) |
| acetoacetyl-CoA synthetase | <enzyme> Catalyses the conversion of acetoacetate and CoA in the presence of ATP to yield AMP, pyrophosphate and acetoacetyl-CoA; the latter is the first intermediate in cholesterogenesis; also acts more slowly on l-3-hydroxybutanoate Registry number: EC 6.2.1.16 Synonym: acetoacetyl-CoA ligase, acetoacetate-CoA ligase, acetoacetyl-coenzyme a synthetase (26 Jun 1999) |
| acetyl-CoA synthetase | A ligase that catalyses the reaction of acetate and CoA and ATP to form AMP, pyrophosphate, and acetyl-CoA. A key step in the activation of acetate. Synonym: acetate thiokinase, acetate-CoA ligase, acetyl-activating enzyme, acetyl-CoA synthetase. (05 Mar 2000) |
| acid cholesterol ester synthetase | <enzyme> Aortal enzyme, does not require exogenous ATP or CoA; reverse reaction of cholesterol esterase Registry number: EC 3.1.1.- Synonym: cholesterol ester synthetase (26 Jun 1999) |
| acyl-CoA synthetase | General term for enzymes that form acyl-CoA, now called ligases, specifically, long-chain fatty acid-CoA ligase. (05 Mar 2000) |
| acyl protein synthetase | <enzyme> Component of the fatty acid reductase complex of luminescent bacteria Registry number: EC 2.3.1.- Synonym: luxe gene product, fatty acyl-protein synthetase (26 Jun 1999) |
| aerobactin synthetase | <enzyme> Condenses 2 molecules of n-epsilon-acetyl-n-epsilon-hydroxylysine with citric acid to form aerobactin Registry number: EC 4.1.3.- (26 Jun 1999) |