PROSITE documentation PDOC00370

Hexokinase domain signature and profile




Description

Hexokinase (EC 2.7.1.1) [1,2] is an important glycolytic enzyme that catalyzes the phosphorylation of keto- and aldohexoses (e.g. glucose, mannose and fructose) using MgATP as the phosphoryl donor.

In vertebrates there are four major isoenzymes, commonly referred as types I, II, III and IV. Type IV hexokinase, which is often incorrectly designated glucokinase [3], is only expressed in liver and pancreatic β-cells and plays an important role in modulating insulin secretion; it is a protein of a molecular mass of about 50 Kd. Hexokinases of types I to III, which have low Km values for glucose, have a molecular mass of about 100 Kd. Structurally they consist of a very small N-terminal hydrophobic membrane-binding domain followed by two highly similar domains of 450 residues. The first domain has lost its catalytic activity and has evolved into a regulatory domain.

In yeast there are three different isoenzymes: hexokinase PI (gene HXK1), PII (gene HXKB), and glucokinase (gene GLK1). All three proteins have a molecular mass of about 50 Kd.

The hexokinase domain has an α/β fold and is distinctly folded in two subdomains of unequal size: the large and small subdomains (see <PDB:1IG8>). The large subdomain comprises a six-stranded mixed β-sheet and a number of additional α-helices. On one side, the sheet packs against the small subdomain, and on the other side it is shielded by several α-helices. The dominant feature of the small subdomain is a five stranded mixed β-sheet. The sheet is flanked by two helices on one side and by one helix on the other. The subdomain also has an additional β-sheet formed by two antiparallel strands [4,5].

All these enzymes contain one (or two in the case of types I to III isozymes) strongly conserved region which has been shown [6] to be involved in substrate binding. We have derived a pattern from that region.

Last update:

February 2015 / Text revised; profile added.

Technical section

PROSITE methods (with tools and information) covered by this documentation:

HEXOKINASE_2, PS51748; Hexokinase domain profile  (MATRIX)

HEXOKINASE_1, PS00378; Hexokinase domain signature  (PATTERN)


References

1AuthorsMiddleton R.J.
TitleHexokinases and glucokinases.
SourceBiochem. Soc. Trans. 18:180-183(1990).
PubMed ID2199258

2AuthorsGriffin L.D., Gelb B.D., Wheeler D.A., Davison D., Adams V., McCabe E.R.
TitleMammalian hexokinase 1: evolutionary conservation and structure to function analysis.
SourceGenomics 11:1014-1024(1991).
PubMed ID1783373

3AuthorsCornish-Bowden A., Luz Cardenas M.
SourceTrends Biochem. Sci. 16:281-282(1991).

4AuthorsKuser P.R., Krauchenco S., Antunes O.A., Polikarpov I.
TitleThe high resolution crystal structure of yeast hexokinase PII with the correct primary sequence provides new insights into its mechanism of action.
SourceJ. Biol. Chem. 275:20814-20821(2000).
PubMed ID10749890
DOI10.1074/jbc.M910412199

5AuthorsAleshin A.E., Zeng C., Bourenkov G.P., Bartunik H.D., Fromm H.J., Honzatko R.B.
TitleThe mechanism of regulation of hexokinase: new insights from the crystal structure of recombinant human brain hexokinase complexed with glucose and glucose-6-phosphate.
SourceStructure 6:39-50(1998).
PubMed ID9493266

6AuthorsSchirch D.M., Wilson J.E.
TitleRat brain hexokinase: location of the substrate hexose binding site in a structural domain at the C-terminus of the enzyme.
SourceArch. Biochem. Biophys. 254:385-396(1987).
PubMed ID3579310



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