title: Development, evaluation and application of tripeptidyl-peptidase II sequence signatures.
abstract: Tripeptidyl-peptidase II (TPP II) is a cytosolic peptidase that has been implicated in fat formation and cancer, apparently independent of the enzymatic activity. In search for alternative functional regions, conserved motifs were identified and eleven signatures were constructed. Seven of the signatures covered previously investigated residues, whereas the functional importance of the other motifs is unknown. This provides directions for future investigations of alternative activities of TPP II. The obtained signatures provide an efficient bioinformatic tool for the identification of TPP II homologues. Hence, a TPP II sequence homologue from fission yeast, Schizosaccharomyces pombe, was identified and demonstrated to encode the TPP II-like protein previously reported as multicorn. Furthermore, an homologous protein was found in the prokaryote Blastopirellula marina, albeit the TPP II function was apparently not conserved. This gene is probably the result of a rare gene transfer from eukaryote to prokaryote.
authors.affiliation: Department of Biochemistry and Organic Chemistry, Uppsala University, Uppsala, Sweden.
authors.forename: Sandra
authors.initials: S
authors.lastname: Eriksson
authors.forename: Omar A
authors.initials: OA
authors.lastname: Gutiérrez
authors.forename: Pernilla
authors.initials: P
authors.lastname: Bjerling
authors.forename: Birgitta
authors.initials: B
authors.lastname: Tomkinson
mesh_terms: D000595:Amino Acid Sequence; D000626:Aminopeptidases; D000818:Animals; D001483:Base Sequence; D002850:Chromatography, Gel; D017124:Conserved Sequence; D017931:DNA Primers; D004152:Dipeptidyl-Peptidases and Tripeptidyl-Peptidases; D004587:Electrophoresis, Agar Gel; D008390:Markov Chains; D008969:Molecular Sequence Data; D010802:Phylogeny; D012568:Schizosaccharomyces / Q000235:genetics; D017386:Sequence Homology, Amino Acid; D012697:Serine Endopeptidases / Q000737:chemistry* / Q000235:genetics
chemical_list: D017931:DNA Primers; D000626:Aminopeptidases; D004152:Dipeptidyl-Peptidases and Tripeptidyl-Peptidases; C048001:tripeptidyl-peptidase 2; D012697:Serine Endopeptidases