In addition, although the original Report used and recommended the symbols NAD and NADH2 for the oxidized and reduced forms respectively of the coenzyme, they also suggested NAD+ and NADH respectively as alternatives. This latter system has the advantage that it allows the plain symbol NAD to refer to the two forms collectively, but it has the disadvantage that it assigns a+superscript to what

is in reality an anion. In practice the system with NAD+ and NADH has become overwhelmingly the most used, and when it became adopted in Enzyme Nomenclature there was a feeling that the equation looked unbalanced with unequal charges on the left and right-hand sides. In what Alberty in particular

considered as a misguided move, this was then “corrected” by including protons in equations. A suggested way to avoid Selleckchem KU 55933 the problem (Alberty and Cornish-Bowden, 1993), in which the two forms of coenzyme were to be written as NADox and NADred has received no significant adoption in the literature. click here As the entry for acetate kinase considered above is one of the simpler examples, with no comments or specificity information (with the implication that the enzyme catalyses that one reaction only) it is useful to examine a more typical entry: EC 2.7.1.1 Accepted name: hexokinase Reaction: ATP+d-hexose=ADP+d-hexose 6-phosphate Other name(s): hexokinase type IV, glucokinase; IMP dehydrogenase hexokinase d; hexokinase type IV; hexokinase (phosphorylating); ATP-dependent hexokinase; glucose ATP phosphotransferase Comments: d-Glucose, d-mannose, d-fructose, sorbitol and d-glucosamine

can act as acceptors; ITP and dATP can act as donors. The liver isoenzyme has sometimes been called glucokinase. Systematic name: ATP:d-hexose 6-phosphotransferase Links to other databases: BRENDA, EXPASY, GTD, IUBMB, KEGG, METACYC, PDB, UM-BBD, CAS registry number: 9001-51-8 References: 1. Bailey, K. andWebb, E.C. Purification of yeast hexokinase and its reaction with ββ′-dichlorodiethyl sulphide. Biochem. J.42 (1948) 60–68. [PMID: 16748250]. 2. Berger, L., Slein, M.W., Colowick, S.P. and Cori, C.F. Isolation of hexokinase from baker׳s yeast. J. Gen. Physiol.29 (1946) 379–391. 3. Kunitz, M. and McDonald, M.R. Crystalline hexokinase (heterophosphatase). Method of isolation and properties. J. Gen. Physiol.29 (1946) 393–412. 4. Pollard-Knight, D. and Cornish-Bowden, A. Mechanism of liver glucokinase. Mol. Cell. Biochem. 44 (1982) 71–80. [PMID: 7048063]. 5. Ureta, T., Radojković, J., Lagos, R., Guixé, V. and Núñez, L. Phylogenetic and ontogenetic studies of glucose phosphorylating isozymes of vertebrates. Arch. Biol. Med. Exp.12 (1979) 587–604. [PMID: 233226]. 6. Cárdenas, M.L., Rabajille, E. and Niemeyer, H. Fructose: A good substrate for rat-liver ‘glucokinase’ (hexokinase d). Biochem. J. 222 (1984) 363–370.