Cell surface differentiation of Mycoplasma mobile visualized by surface protein localization

Area of Science:

• Microbiology
• Cell Biology
• Biochemistry

Background:

• Mycoplasma mobile exhibits flask-shaped morphology and glides on solid substrates via an unknown mechanism.
• Cellular adhesion and gliding are critical for Mycoplasma mobile's motility and interaction with surfaces.

Purpose of the Study:

• To characterize the outer surface proteins of Mycoplasma mobile.
• To identify proteins involved in the adhesion and gliding mechanisms of Mycoplasma mobile.

Main Methods:

• Generation and screening of monoclonal antibodies against intact Mycoplasma mobile cells.
• Identification of protein targets using antibody-protein interactions.
• Immunofluorescence microscopy to determine the subcellular localization of surface proteins.

Main Results:

• The Gli349 protein was identified as a major adhesion protein, capable of mediating attachment to glass.
• Three members of the Mvsp protein family (MvspN, MvspO, MvspK, MvspI) were identified as major surface antigens.
• Differential localization of Gli349 and Mvsp proteins on the cell surface was observed, with Gli349 in the neck and Mvsp proteins in the head and body.

Conclusions:

• Gli349 is the primary protein responsible for Mycoplasma mobile's attachment to solid surfaces.
• Mycoplasma mobile expresses multiple paralogues of its major surface antigen (Mvsp family) with distinct subcellular localizations.
• The differential localization of surface proteins suggests a specialized role in cell surface differentiation and potentially gliding motility.