title: Genetic identification of exported proteins in Streptococcus pneumoniae.
abstract: A strategy was developed to mutate and genetically identify exported proteins in Streptococcus pneumoniae. Vectors were created and used to screen pneumococcal DNA in Escherichia coli and S. pneumoniae for translational gene fusions to alkaline phosphatase (PhoA). Twenty five PhoA+ pneumococcal mutants were isolated and the loci from eight of these mutants showed similarity to known exported or membrane-associated proteins. Homologues were found to: (i) protein-dependent peptide permeases, (ii) penicillin-binding proteins, (iii) Clp proteases, (iv) two-component sensor regulators, (v) the phosphoenolpyruvate: carbohydrate phosphotransferases permeases, (vi) membrane-associated dehydrogenases, (vii) P-type (E1E2-type) cation transport ATPases, (viii) ABC transporters responsible for the translocation of the RTX class of bacterial toxins. Unexpectedly one PhoA+ mutant contained a fusion to a member of the DEAD protein family of ATP-dependent RNA helicases suggesting export of these proteins.
authors.affiliation: Laboratory of Molecular Infectious Diseases, Rockefeller University, New York, New York 10021.
authors.forename: B J
authors.initials: BJ
authors.lastname: Pearce
authors.forename: Y B
authors.initials: YB
authors.lastname: Yin
authors.forename: H R
authors.initials: HR
authors.lastname: Masure
mesh_terms: D049069:ATP-Dependent Proteases; D000469:Alkaline Phosphatase / Q000096:biosynthesis* / Q000235:genetics; D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000096:biosynthesis* / Q000235:genetics; D001483:Base Sequence; D002352:Carrier Proteins / Q000096:biosynthesis / Q000235:genetics; D003001:Cloning, Molecular; D004798:Enzymes / Q000096:biosynthesis* / Q000235:genetics; D004926:Escherichia coli / Q000378:metabolism; D005798:Genes, Bacterial; D005822:Genetic Vectors; D006360:Heat-Shock Proteins / Q000096:biosynthesis / Q000235:genetics; D006602:Hexosyltransferases; D026901:Membrane Transport Proteins / Q000096:biosynthesis / Q000235:genetics; D008969:Molecular Sequence Data; D002267:Muramoylpentapeptide Carboxypeptidase / Q000096:biosynthesis / Q000235:genetics; D016254:Mutagenesis, Insertional; D009838:Oligodeoxyribonucleotides; D010088:Oxidoreductases / Q000096:biosynthesis / Q000235:genetics; D046915:Penicillin-Binding Proteins; D010458:Peptidyl Transferases; D014176:Protein Biosynthesis; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis; D017386:Sequence Homology, Amino Acid; D012697:Serine Endopeptidases / Q000096:biosynthesis / Q000235:genetics; D013296:Streptococcus pneumoniae / Q000235:genetics / Q000378:metabolism*
chemical_list: D001426:Bacterial Proteins; D002352:Carrier Proteins; D004798:Enzymes; D006360:Heat-Shock Proteins; D026901:Membrane Transport Proteins; D009838:Oligodeoxyribonucleotides; D046915:Penicillin-Binding Proteins; D011993:Recombinant Fusion Proteins; D010088:Oxidoreductases; D010458:Peptidyl Transferases; D006602:Hexosyltransferases; D000469:Alkaline Phosphatase; D002267:Muramoylpentapeptide Carboxypeptidase; D049069:ATP-Dependent Proteases; D012697:Serine Endopeptidases