title: SipY Is the Streptomyces lividans type I signal peptidase exerting a major effect on protein secretion.
abstract: Most bacteria contain one type I signal peptidase (SPase) for cleavage of signal peptides from secreted proteins. The developmental complex bacterium Streptomyces lividans has the ability to produce and secrete a significant amount of proteins and has four different type I signal peptidases genes (sipW, sipX, sipY, and sipZ) unusually clustered in its chromosome. Functional analysis of the four SPases was carried out by phenotypical and molecular characterization of the different individual sip mutants. None of the sip genes seemed to be essential for bacterial growth. Analysis of total extracellular proteins indicated that SipY is likely to be the major S. lividans SPase, since the sipY mutant strain is highly deficient in overall protein secretion and extracellular protease production, showing a delayed sporulation phenotype when cultured in solid medium.
authors.affiliation: Centro Nacional de Biotecnología, Campus de la Universidad Autónoma, Cantoblanco, 28049 Madrid, Spain.
authors.forename: Arantxa
authors.initials: A
authors.lastname: Palacín
authors.forename: Víctor
authors.initials: V
authors.lastname: Parro
authors.forename: Nick
authors.initials: N
authors.lastname: Geukens
authors.forename: Jozef
authors.initials: J
authors.lastname: Anné
authors.forename: Rafael P
authors.initials: RP
authors.lastname: Mellado
mesh_terms: D001426:Bacterial Proteins / Q000378:metabolism*; D006026:Glycoside Hydrolases / Q000096:biosynthesis; D008565:Membrane Proteins; D012697:Serine Endopeptidases / Q000502:physiology*; D013302:Streptomyces / Q000201:enzymology* / Q000378:metabolism
chemical_list: D001426:Bacterial Proteins; D008565:Membrane Proteins; D006026:Glycoside Hydrolases; C019624:agarase; D012697:Serine Endopeptidases; C026515:type I signal peptidase