title: Proteome and immunome of pathogenic Leptospira spp. revealed by 2DE and 2DE-immunoblotting with immune serum.
abstract: In this study, proteomes of two pathogenic Leptospira spp., namely L. interrogans, serogroup Icterohaemorrhagiae, serovar Copenhageni and L. borgpetersenii, serogroup Tarassovi, serovar Tarassovi, were revealed by using two dimensional gel electrophoresis (2DE)-based-proteomics. Bacterial cells were disrupted in a lysis buffer containing 30 mM Tris, 2 M thiourea, 7 M urea, 4% CHAPS, 2% IPG buffer pH 3-10 and protease inhibitors and then subjected to sonication in order to solubilize as much as possible the bacterial proteins. The 2DE-separated components of both Leptospira homogenates were blotted individually onto membranes and antigenic components (immunomes) were revealed by probing the blots with immune serum of a mouse readily immunized with the homogenate of L. interrogans, serogroup Icterohaemorrhagiae, serovar Copenhageni. The immunogenic proteins of the two pathogenic Leptospira spp. could be grouped into 10 groups. These are: 1) proteins involved in the bacterial transcription and translation including beta subunit transcription anti-termination protein of DNA polymerase III, elongation factors Tu and Ts, and tRNA (guanine-N1)-methyltransferase; 2) proteins functioning as enzymes for metabolisms and nutrient acquisition including acetyl-Co-A acetyltransferase, putative glutamine synthetase, glyceraldehyde-3-phospahte dehydrogenase, NifU-like protein, 3-oxoacyl-(acyl-carrier-protein) reductase, oxidoreductase, sphingomyelinase C precursor, spermidine synthase, beta subunit of succinyl-CoA synthetase, and succinate dehydrogenase iron-sulfur subunit; 3) proteins/enzymes necessary for energy and electron transfer, i.e. electron transfer flavoprotein, and proton-translocating transhydrogenase; 4) enzymes for degradation of misfolded proteins, i.e. ATP-dependent Clp protease; 5) molecular chaperone, i.e. 60 kDa chaperonin; 6) signal transduction system, i.e. response regulator; 7) protein involved in immune evasion in host, i.e. peroxiredoxin; 8) cell structure proteins including MreB (cytoskeletal) and flagellin/ periplasmic flagellin; 9) lipoproteins/outer membrane proteins: LipL32, LipL41, LipL45 and OmpL1; and 10) various hypothetical proteins. Many immunogenic proteins are common to both Leptospira spp. These proteins not only are the diagnostic targets but also have potential as candidates of a broad spectrum leptospirosis vaccine especially the surface exposed components which should be vulnerable to the host immune effector factors.
authors: Graduate Program of Biomedical Sciences, Faculty of Allied Health Sciences, Thammasat University Rangsit Center, Pathim-thani, Thailand.
authors: Yuwaporn
authors: Y
authors: Sakolvaree
authors: Santi
authors: S
authors: Maneewatch
authors: Surasak
authors: S
authors: Jiemsup
authors: Buppa
authors: B
authors: Klaysing
authors: Pongsri
authors: P
authors: Tongtawe
authors: Potjanee
authors: P
authors: Srimanote
authors: Patcharin
authors: P
authors: Saengjaruk
authors: Sirinuch
authors: S
authors: Banyen
authors: Pramuan
authors: P
authors: Tapchaisri
authors: Manas
authors: M
authors: Chonsa-nguan
authors: Wanpen
authors: W
authors: Chaicumpa
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000942:Antigens, Bacterial / Q000737:chemistry / Q000276:immunology* / Q000302:isolation & purification; D015153:Blotting, Western; D015180:Electrophoresis, Gel, Two-Dimensional; D007919:Leptospira / Q000737:chemistry / Q000276:immunology* / Q000302:isolation & purification; D041383:Leptospira interrogans serovar icterohaemorrhagiae / Q000737:chemistry / Q000276:immunology*; D007922:Leptospirosis / Q000382:microbiology; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008969:Molecular Sequence Data; D020543:Proteome / Q000276:immunology*; D040901:Proteomics
chemical_list: D000942:Antigens, Bacterial; D020543:Proteome