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Protein Science, Vol 7, Issue 7 1647-1652, Copyright © 1998 by Cold Spring Harbor Laboratory Press
FOR THE RECORD |
M. C. THALLER, S. SCHIPPA and G. M. ROSSOLINI
Dipartimento di Biologia, Universita di Roma ``Tor Vergata,'' 00133 Rome, Italy
Members of a new molecular family of bacterial nonspecific acid phosphatases (NSAPs), indicated as class C, were found to share significant sequence similarities to bacterial class B NSAPs and to some plant acid phosphatases, representing the first example of a family of bacterial NSAPs that has a relatively close eukaryotic counterpart. Despite the lack of an overall similarity, conserved sequence motifs were also identified among the above enzyme families (class B and class C bacterial NSAPs, and related plant phosphatases) and several other families of phosphohydrolases, including bacterial phosphoglycolate phosphatases, histidinol-phosphatase domains of the bacterial bifunctional enzymes imidazole-glycerolphosphate dehydratases, and bacterial, eukaryotic, and archaeal phosphoserine phosphatases and threalose-6-phosphatases. These conserved motifs are clustered within two domains, separated by a variable spacer region, according to the pattern [FILMAVT]-D-[ILFRMVY]-D-[GSNDE]-[TV]-[ILVAM]-[ATSVILMC]-X-{YFWHKR}-X- {YFWHNQ}-X(102,191)-{KRHNQ}-G-D-{FYWHILVMC}-{QNH}-{FWYGP}-D-{PSNQYW}. The dephosphorylating activity common to all these proteins supports the definition of this phosphatase motif and the inclusion of these enzymes into a superfamily of phosphohydrolases that we propose to indicate as ``DDDD'' after the presence of the four invariant aspartate residues. Database searches retrieved various hypothetical proteins of unknown function containing this or similar motifs, for which a phosphohydrolase activity could be hypothesized.
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