title: Identification of two components of the Serratia marcescens metalloprotease transporter: protease SM secretion in Escherichia coli is TolC dependent.
abstract: The Serratia marcescens metalloprotease (protease SM) belongs to a family of proteins secreted from gram-negative bacteria by a signal peptide-independent pathway which requires a specific transporter consisting of three proteins: two in the inner membrane and one in the outer membrane. The prtDSM and prtESM genes encoding the two S. marcescens inner membrane components were cloned and expressed in Escherichia coli. Their nucleotide sequence revealed high overall homology with the two analogous inner membrane components of the Erwinia chrysanthemi protease secretion apparatus and lower, but still significant, homology with the two analogous inner membrane components of the E. coli hemolysin transporter. When expressed in E. coli, these two proteins, PrtDSM and PrtESM, allowed the secretion of protease SM only in the presence of TolC protein, the outer membrane component of the hemolysin transporter.
authors.affiliation: Unité de Génétique Moléculaire, Institut Pasteur (Centre National de la Recherche Scientifique URA 1149, Paris, France.
authors.forename: S
authors.initials: S
authors.lastname: Létoffé
authors.forename: J M
authors.initials: JM
authors.lastname: Ghigo
authors.forename: C
authors.initials: C
authors.lastname: Wandersman
mesh_terms: D018528:ATP-Binding Cassette Transporters; D000595:Amino Acid Sequence; D001425:Bacterial Outer Membrane Proteins / Q000378:metabolism*; D001426:Bacterial Proteins / Q000096:biosynthesis / Q000235:genetics; D001483:Base Sequence; D002352:Carrier Proteins; D002462:Cell Membrane / Q000378:metabolism; D003001:Cloning, Molecular; D016974:Dickeya chrysanthemi / Q000201:enzymology; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism*; D029968:Escherichia coli Proteins; D005798:Genes, Bacterial; D008565:Membrane Proteins; D026901:Membrane Transport Proteins; D008666:Metalloendopeptidases / Q000096:biosynthesis* / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D015183:Restriction Mapping; D017386:Sequence Homology, Amino Acid; D012706:Serratia marcescens / Q000201:enzymology* / Q000235:genetics
chemical_list: D018528:ATP-Binding Cassette Transporters; D001425:Bacterial Outer Membrane Proteins; D001426:Bacterial Proteins; D002352:Carrier Proteins; D029968:Escherichia coli Proteins; C093958:HasE protein, Serratia marcescens; D008565:Membrane Proteins; D026901:Membrane Transport Proteins; C084171:PrtD protein, Serratia marcescens; C073126:tolC protein, E coli; D008666:Metalloendopeptidases; C084170:protease SM