title: Secretomes of Mycoplasma hyopneumoniae and Mycoplasma flocculare reveal differences associated to pathogenesis.
abstract: Mycoplasma hyopneumoniae and Mycoplasma flocculare cohabit the porcine respiratory tract. However, M. hyopneumoniae causes the porcine enzootic pneumonia, while M. flocculare is a commensal bacterium. Comparative analyses demonstrated high similarity between these species, which includes the sharing of all predicted virulence factors. Nevertheless, studies related to soluble secretomes of mycoplasmas were little known, although they are important for bacterial-host interactions. The aim of this study was to perform a comparative analysis between the soluble secreted proteins repertoires of the pathogenic Mycoplasma hyopneumoniae and its closely related commensal Mycoplasma flocculare. For that, bacteria were cultured in medium with reduced serum concentration and secreted proteins were identified by a LC-MS/MS proteomics approach. Altogether, 62 and 26 proteins were identified as secreted by M. hyopneumoniae and M. flocculare, respectively, being just seven proteins shared between these bacteria. In M. hyopneumoniae secretome, 15 proteins described as virulence factors were found; while four putative virulence factors were identified in M. flocculare secretome. For the first time, clear differences related to virulence were found between these species, helping to elucidate the pathogenic nature of M. hyopneumoniae to swine hosts.
  
  
  
  For the first time, the secretomes of two porcine respiratory mycoplasmas, namely the pathogenic M. hyopneumoniae and the commensal M. flocculare were compared. The presented results revealed previously unknown differences between these two genetically related species, some of which are associated to the M. hyopneumoniae ability to cause porcine enzootic pneumonia.
authors.affiliation: Laboratório de Genômica Estrutural e Funcional, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Avenida Bento Gonçalves, 9500 Porto Alegre, Rio Grande do Sul, Brazil.
authors.forename: Jéssica A
authors.initials: JA
authors.lastname: Paes
authors.affiliation: Laboratório de Genômica Estrutural e Funcional, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Avenida Bento Gonçalves, 9500 Porto Alegre, Rio Grande do Sul, Brazil.
authors.forename: Karina R
authors.initials: KR
authors.lastname: Lorenzatto
authors.affiliation: Laboratório de Genômica Estrutural e Funcional, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Avenida Bento Gonçalves, 9500 Porto Alegre, Rio Grande do Sul, Brazil.
authors.forename: Sofia N
authors.initials: SN
authors.lastname: de Moraes
authors.affiliation: Biological Mass Spectrometry Laboratory, Clinical Chemistry Branch, Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA, United States.
authors.forename: Hercules
authors.initials: H
authors.lastname: Moura
authors.affiliation: Biological Mass Spectrometry Laboratory, Clinical Chemistry Branch, Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA, United States.
authors.forename: John R
authors.initials: JR
authors.lastname: Barr
authors.affiliation: Laboratório de Genômica Estrutural e Funcional, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Avenida Bento Gonçalves, 9500 Porto Alegre, Rio Grande do Sul, Brazil. Electronic address: henrique@cbiot.ufrgs.br.
authors.forename: Henrique B
authors.initials: HB
authors.lastname: Ferreira
mesh_terms: D000818:Animals; D001426:Bacterial Proteins / Q000378:metabolism; D009174:Mycoplasma / Q000737:chemistry / Q000472:pathogenicity; D045705:Mycoplasma hyopneumoniae / Q000737:chemistry / Q000472:pathogenicity*; D045729:Pneumonia of Swine, Mycoplasmal / Q000382:microbiology*; D040901:Proteomics / Q000379:methods; D013045:Species Specificity; D013552:Swine; D037521:Virulence Factors / Q000032:analysis
chemical_list: D001426:Bacterial Proteins; D037521:Virulence Factors
keywords: Comparative analyses; LC-MS/MS; Mycoplasma flocculare; Mycoplasma hyopneumoniae; Secretome