title: Muscle endopin 1, a muscle intracellular serpin which strongly inhibits elastase: purification, characterization, cellular localization and tissue distribution.
abstract: In the present work, an endopin-like elastase inhibitor was purified for the first time from bovine muscle. A three-step chromatography procedure was developed including successively SP-Sepharose, Q-Sepharose and EMD-DEAE 650. This procedure provides about 300 microg of highly pure inhibitor from 500 g of bovine diaphragm muscle. The N-terminal sequence of the muscle elastase inhibitor, together with the sequence of a trypsin-generated peptide, showed 100% similarity with the cDNA deduced sequence of chromaffin cell endopin 1. Hence, the muscle inhibitor was designated muscle endopin 1 (mEndopin 1). mEndopin 1 had a molecular mass of 70 kDa, as assessed by both gel filtration and SDS/PAGE. According to the association rates determined, mEndopin 1 is a potent inhibitor of elastase (kass=2.41x10(7) M(-1).s(-1)) and trypsin (kass=3.92x10(6) M(-1).s(-1)), whereas plasmin (kass=1.78x10(3) M(-1).s(-1)) and chymotrypsin (kass=1.0x10(2) M(-1).s(-1)) were only moderately inhibited. By contrast, no inhibition was detected against several other selected serine proteinases, as well as against cysteine proteinases of the papain family. The cellular location of mEndopin in muscle tissue and its tissue distribution were investigated using a highly specific rabbit antiserum. The results obtained demonstrate an intracellular location and a wide distribution in bovine tissues.
authors.affiliation: Station de Recherches sur la Viande, Laboratoire de Biochimie des Protéines, INRA de Theix, 63122 Saint Genès Champanelle, France.
authors.forename: Caroline
authors.initials: C
authors.lastname: Tassy
authors.forename: Carlos H
authors.initials: CH
authors.lastname: Herrera-Mendez
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Sentandreu
authors.forename: Laurent
authors.initials: L
authors.lastname: Aubry
authors.forename: Laure
authors.initials: L
authors.lastname: Brémaud
authors.forename: Patrick
authors.initials: P
authors.lastname: Pélissier
authors.forename: Didier
authors.initials: D
authors.lastname: Delourme
authors.forename: Michèle
authors.initials: M
authors.lastname: Brillard
authors.forename: Francis
authors.initials: F
authors.lastname: Gauthier
authors.forename: Hubert
authors.initials: H
authors.lastname: Levéziel
authors.forename: Ahmed
authors.initials: A
authors.lastname: Ouali
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002417:Cattle; D004795:Enzyme Stability; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D018482:Muscle, Skeletal / Q000502:physiology; D010196:Pancreatic Elastase / Q000037:antagonists & inhibitors*; D015843:Serpins / Q000737:chemistry* / Q000378:metabolism; D014018:Tissue Distribution; D014357:Trypsin / Q000378:metabolism
chemical_list: C402207:SERPINA3 protein, Bos taurus; D015843:Serpins; D010196:Pancreatic Elastase; D014357:Trypsin