title: cDNA cloning of porcine brain prolyl endopeptidase and identification of the active-site seryl residue.
abstract: Prolyl endopeptidase is a cytoplasmic serine protease. The enzyme was purified from porcine kidney, and oligonucleotides based on peptide sequences from this protein were used to isolate a cDNA clone from a porcine brain library. This clone contained the complete coding sequence of prolyl endopeptidase and encoded a polypeptide with a molecular mass of 80,751 Da. The deduced amino acid sequence of prolyl endopeptidase showed no sequence homology with other known serine proteases. [3H]Diisopropyl fluorophosphate was used to identify the active-site serine of prolyl endopeptidase. One labeled peptide was isolated and sequenced. The sequence surrounding the active-site serine was Asn-Gly-Gly-Ser-Asn-Gly-Gly. This sequence is different from the active-site sequences of other known serine proteases. This difference and the lack of overall homology with the known families of serine proteases suggest that prolyl endopeptidase represents a new type of serine protease.
authors.affiliation: Friedrich Miescher-Institut, Basel, Switzerland.
authors.forename: D
authors.initials: D
authors.lastname: Rennex
authors.forename: B A
authors.initials: BA
authors.lastname: Hemmings
authors.forename: J
authors.initials: J
authors.lastname: Hofsteenge
authors.forename: S R
authors.initials: SR
authors.lastname: Stone
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001665:Binding Sites; D001921:Brain / Q000201:enzymology*; D003001:Cloning, Molecular; D004247:DNA / Q000235:genetics*; D010450:Endopeptidases / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism; D007668:Kidney / Q000201:enzymology; D007700:Kinetics; D008969:Molecular Sequence Data; D015345:Oligonucleotide Probes; D009928:Organ Specificity; D000085822:Prolyl Oligopeptidases; D015183:Restriction Mapping; D012694:Serine; D012697:Serine Endopeptidases; D013552:Swine
chemical_list: D015345:Oligonucleotide Probes; D012694:Serine; D004247:DNA; D010450:Endopeptidases; D012697:Serine Endopeptidases; D000085822:Prolyl Oligopeptidases