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Bogema DR, Scott NE, Padula MP, Tacchi JL, Raymond BBA, Jenkins C, Cordwell SJ, Minion FC, Walker MJ, Djordjevic SP. Sequence TTKF ↓ QE defines the site of proteolytic cleavage in Mhp683 protein, a novel glycosaminoglycan and cilium adhesin of Mycoplasma hyopneumoniae. J Biol Chem 2011; 286:41217-41229. [PMID: 21969369 DOI: 10.1074/jbc.m111.226084] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Mycoplasma hyopneumoniae colonizes the ciliated respiratory epithelium of swine, disrupting mucociliary function and inducing chronic inflammation. P97 and P102 family members are major surface proteins of M. hyopneumoniae and play key roles in colonizing cilia via interactions with glycosaminoglycans and mucin. The p102 paralog, mhp683, and homologs in strains from different geographic origins encode a 135-kDa pre-protein (P135) that is cleaved into three fragments identified here as P45(683), P48(683), and P50(683). A peptide sequence (TTKF↓QE) was identified surrounding both cleavage sites in Mhp683. N-terminal sequences of P48(683) and P50(683), determined by Edman degradation and mass spectrometry, confirmed cleavage after the phenylalanine residue. A similar proteolytic cleavage site was identified by mass spectrometry in another paralog of the P97/P102 family. Trypsin digestion and surface biotinylation studies showed that P45(683), P48(683), and P50(683) reside on the M. hyopneumoniae cell surface. Binding assays of recombinant proteins F1(683)-F5(683), spanning Mhp683, showed saturable and dose-dependent binding to biotinylated heparin that was inhibited by unlabeled heparin, fucoidan, and mucin. F1(683)-F5(683) also bound porcine epithelial cilia, and antisera to F2(683) and F5(683) significantly inhibited cilium binding by M. hyopneumoniae cells. These data suggest that P45(683), P48(683), and P50(683) each display cilium- and proteoglycan-binding sites. Mhp683 is the first characterized glycosaminoglycan-binding member of the P102 family.
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Affiliation(s)
- Daniel R Bogema
- NSW Department of Primary Industries, Elizabeth Macarthur Agricultural Institute, Camden 2567, New South Wales, Australia; School of Biological Sciences, University of Wollongong, Wollongong 2522, New South Wales, Australia
| | - Nichollas E Scott
- School of Molecular and Microbial Biosciences, University of Sydney, Sydney 2006, New South Wales, Australia
| | - Matthew P Padula
- The ithree Institute, University of Technology, Sydney 2007, New South Wales, Australia
| | - Jessica L Tacchi
- The ithree Institute, University of Technology, Sydney 2007, New South Wales, Australia
| | - Benjamin B A Raymond
- The ithree Institute, University of Technology, Sydney 2007, New South Wales, Australia
| | - Cheryl Jenkins
- NSW Department of Primary Industries, Elizabeth Macarthur Agricultural Institute, Camden 2567, New South Wales, Australia
| | - Stuart J Cordwell
- School of Molecular and Microbial Biosciences, University of Sydney, Sydney 2006, New South Wales, Australia
| | - F Chris Minion
- Veterinary Microbiology and Preventive Medicine, Iowa State University, Ames, Iowa 50011
| | - Mark J Walker
- School of Biological Sciences, University of Wollongong, Wollongong 2522, New South Wales, Australia; School of Chemistry and Molecular Biosciences and the Australian Infectious Diseases Research Centre, University of Queensland, Brisbane 4072, Queensland, Australia
| | - Steven P Djordjevic
- NSW Department of Primary Industries, Elizabeth Macarthur Agricultural Institute, Camden 2567, New South Wales, Australia; The ithree Institute, University of Technology, Sydney 2007, New South Wales, Australia.
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