title: The effect of protein expression of Streptococcus pneumoniae by blood.
abstract: During infection, the common respiratory tract pathogen Streptococcus pneumoniae encounters several environmental conditions, such as upper respiratory tract, lung tissue, and blood stream, etc. In this study, we examined the effects of blood on S. pneumoniae protein expression using a combination of highly sensitive 2-dimensional electrophoresis (DE) and MALDI-TOF MS and/or LC/ESI-MS/MS. A comparison of expression profiles between the growth in THY medium and THY supplemented with blood allowed us to identify 7 spots, which increased or decreased two times or more compared with the control group: tyrosyl-tRNA synthetase, lactate oxidase, glutamyl-aminopeptidase, L-lactate dehydrogenase, cysteine synthase, ribose-phosphate pyrophosphokinase, and orotate phosphoribosyltransferase. This global approach can provide a better understanding of S. pneumoniae adaptation to its human host and a clue for its pathogenicity.
authors.affiliation: Division of Bacterial Respiratory Infections, Center for Infectious Disease, National Institute of Health, Korea Center for Diseases control and Prevention, 5 Nokbun-Dong, Eunpyung-Ku, Seoul, 122-701, Korea. Kwangjun@yahoo.com
authors.forename: Song-Mee
authors.initials: SM
authors.lastname: Bae
authors.forename: Sun-Mi
authors.initials: SM
authors.lastname: Yeon
authors.forename: Tong-Soo
authors.initials: TS
authors.lastname: Kim
authors.forename: Kwang-Jun
authors.initials: KJ
authors.lastname: Lee
mesh_terms: D001426:Bacterial Proteins / Q000378:metabolism*; D001769:Blood / Q000382:microbiology*; D001798:Blood Proteins / Q000494:pharmacology; D015180:Electrophoresis, Gel, Two-Dimensional; D006801:Humans; D020543:Proteome; D040901:Proteomics; D013296:Streptococcus pneumoniae / Q000187:drug effects / Q000378:metabolism* / Q000502:physiology
chemical_list: D001426:Bacterial Proteins; D001798:Blood Proteins; D020543:Proteome