PROSITE documentation PDOC51481
DhaK domain profile


Dihydroxyacetone (Dha) kinases are a family of sequence-conserved enzymes that phosphorylate dihydroxyacetone, glyceraldehyde and other short-chain ketoses and aldoses. They can be divided into two groups according to the source of high-energy phosphate that they utilize, either ATP or phosphoenolpyruvate (PEP). The ATP-dependent forms are the two-domain Dha kinases (DAK), which occur in animals, plants and eubacteria. They consist of a Dha binding (K) and an ATP binding (L) (see <PDOC51480>) domain. The PEP-dependent forms occur only in eubacteria and a few archaebacteria and consist of three subunits. Two subunits, DhaK and DhaL, are homologous to the K and L domains. Intriguingly, the ADP moiety is not exchanged for ATP but remains permanently bound to the DhaL subunit where it is rephosphorylated in situ by the third subunit, DhaM, which is homologous to the IIA domain of the mannose transporter of the bacterial PEP:sugar phosphotransferase system (PTS) (see <PDOC00528>) [1,2].

The DhaK domain consists of two α/β-folds, each containing a six-stranded mixed β-sheet surrounded by six and three helices, respectively (see <PDB:1UN8>). Dha is bound in hemiaminal linkage to the imidazole nitrogen of an invariant histidine [3,4].

The profile we developed covers the entire DhaK domain.

Last update:

February 2010 / First entry.


Technical section

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

DHAK, PS51481; DhaK domain profile  (MATRIX)


1AuthorsOberholzer A.E. Schneider P. Baumann U. Erni B.
TitleCrystal structure of the nucleotide-binding subunit DhaL of the Escherichia coli dihydroxyacetone kinase.
SourceJ. Mol. Biol. 359:539-545(2006).
PubMed ID16647083

2AuthorsZurbriggen A. Jeckelmann J.-M. Christen S. Bieniossek C. Baumann U. Erni B.
TitleX-ray structures of the three Lactococcus lactis dihydroxyacetone kinase subunits and of a transient intersubunit complex.
SourceJ. Biol. Chem. 283:35789-35796(2008).
PubMed ID18957416

3AuthorsSiebold C. Arnold I. Garcia-Alles L.F. Baumann U. Erni B.
TitleCrystal structure of the Citrobacter freundii dihydroxyacetone kinase reveals an eight-stranded alpha-helical barrel ATP-binding domain.
SourceJ. Biol. Chem. 278:48236-48244(2003).
PubMed ID12966101

4AuthorsSiebold C. Garcia-Alles L.F. Erni B. Baumann U.
TitleA mechanism of covalent substrate binding in the x-ray structure of subunit K of the Escherichia coli dihydroxyacetone kinase.
SourceProc. Natl. Acad. Sci. U.S.A. 100:8188-8192(2003).
PubMed ID12813127

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