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Molecular characterization of the P1-like adhesin gene from Mycoplasma pirum
T N Tham1, S Ferris, E Bahraoui
1Departement du SIDA et des Rétrovirus, Oncologie Virale, Institut Pasteur, Paris, France.
Abstract:
A DNA fragment has been isolated from the genome of Mycoplasma pirum by use of a genetic probe derived from the conserved region within the genes for the major adhesins of Mycoplasma genitalium and Mycoplasma pneumoniae. A gene encoding an adhesin-like polypeptide was localized, and sequence analysis indicated a G + C content of only 28%, with A- and T-rich codons being preferentially used. A total of 91% of positions 3 were either A or T. The deduced polypeptide is 1,144 amino acids long (126 kDa) and shows 26% identity with the adhesins of M. genitalium and M. pneumoniae. Other features in common with these two membrane proteins include a similar hydropathic profile and a proline-rich C terminus. Antibodies were prepared by using as an immunogen a peptide derived from the C terminus of the M. pirum adhesin-like polypeptide and were found to recognize on immunoblots a 126-kDa polypeptide from an M. pirum cellular extract. The characterization of the adhesin-like gene is a first step toward a better understanding of the mechanisms allowing this human mycoplasma to attach to host cells.
Insights
Researchers identified a novel adhesin-like gene in Mycoplasma pirum, crucial for understanding how this human pathogen attaches to host cells. This finding advances knowledge of mycoplasma adhesion mechanisms.
Area of Science:
- Microbiology
- Molecular Biology
- Genomics
Background:
- Mycoplasma species, including Mycoplasma pirum, Mycoplasma genitalium, and Mycoplasma pneumoniae, are known human pathogens.
- Adhesins are critical surface proteins mediating host cell attachment in mycoplasmas.
- Understanding adhesin function is key to deciphering pathogen-host interactions.
Purpose of the Study:
- To isolate and characterize a DNA fragment encoding an adhesin-like protein from Mycoplasma pirum.
- To analyze the genetic and protein features of the identified adhesin-like molecule.
- To investigate the potential role of this protein in Mycoplasma pirum adherence.
Main Methods:
- Isolation of a DNA fragment using a genetic probe from conserved adhesin gene regions.
- DNA sequencing and analysis of the G+C content and codon usage.
- Bioinformatic analysis to predict polypeptide length, identity, and hydropathic profile.
- Antibody production against a C-terminal peptide for protein detection.
Main Results:
- A novel gene encoding a 1,144 amino acid (126 kDa) adhesin-like polypeptide was identified in Mycoplasma pirum.
- Sequence analysis revealed a low G+C content (28%) and preferential use of A- and T-rich codons.
- The deduced polypeptide shares 26% identity with adhesins from M. genitalium and M. pneumoniae, including a proline-rich C terminus.
- Generated antibodies recognized a 126-kDa polypeptide in M. pirum cellular extracts.
Conclusions:
- The characterization of this adhesin-like gene represents a significant advancement in understanding Mycoplasma pirum's attachment mechanisms.
- The identified protein shares structural similarities with known mycoplasma adhesins, suggesting a conserved functional role.
- Further research into this adhesin-like protein will illuminate host cell interactions and potential therapeutic targets.