The adhesin related 30-kDa protein of Mycoplasma pneumoniae exhibits size and antigen variability

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Biomimetic Materials to Characterize Bacteria-host Interactions
12:22

Biomimetic Materials to Characterize Bacteria-host Interactions

Published on: November 16, 2015

G Layh-Schmitt1, R Himmelreich, U Leibfried

  • 1Zentrum für Molekulare Biologie Heidelberg, Universität Heidelberg, Germany.

FEMS Microbiology Letters
|July 1, 1997
PubMed

Insights

Mycoplasma pneumoniae uses a proline-rich C-terminal region of its 30-kDa adhesin protein for cell attachment. Deleting repetitive sequences in this region prevents bacterial adherence, highlighting its importance for cytadherence.

Area of Science:

  • Microbiology
  • Cell Biology
  • Molecular Biology

Background:

  • Mycoplasma pneumoniae is a significant human respiratory pathogen.
  • Bacterial adhesins are crucial for host cell colonization.
  • The adhesin related 30-kDa protein of M. pneumoniae mediates cytadherence.

Purpose of the Study:

  • To investigate the role of the repetitive C-terminal region of the 30-kDa adhesin protein in Mycoplasma pneumoniae cytadherence.
  • To characterize a mutant with deletions in this repetitive region.

Main Methods:

  • Isolation and characterization of a Mycoplasma pneumoniae mutant (M7) using an erythrocyte binding assay.
  • Analysis of the adhesin related protein in the wild-type and mutant strains.
  • Assessment of cytadherence to erythrocytes and a human colon carcinoma cell line.

Main Results:

  • Mutant M7 lost 12 of 13 repetitive sequences in the C-terminal region of the 30-kDa adhesin protein, resulting in a truncated 22-kDa protein.
  • The truncated protein exhibited reduced antigenicity.
  • Mutant M7 was incapable of adhering to erythrocytes and a human colon carcinoma cell line.
  • Carboxypeptidase Y accessibility confirmed surface exposure of the C-terminus.

Conclusions:

  • The repetitive C-terminal region of the 30-kDa adhesin related protein is essential for Mycoplasma pneumoniae cytadherence.
  • Truncation of this region significantly impairs bacterial adhesion to host cells.
  • The C-terminus of the adhesin protein is surface-exposed and critical for its function.

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