Differentiation of mycoplasmatales from bacterial protoplast L-forms by assay for penicillin binding proteins

Area of Science:

• Microbiology
• Prokaryotic Cell Biology
• Biochemistry

Background:

• Cell wall-less prokaryotes, such as L-forms and Mycoplasma, present challenges in classification.
• Penicillin binding proteins (PBPs) are crucial enzymes involved in bacterial cell wall synthesis.
• Understanding the presence or absence of specific proteins can aid in differentiating microbial groups.

Purpose of the Study:

• To investigate the presence and distribution of penicillin binding proteins (PBPs) in cell wall-less prokaryotes.
• To evaluate the utility of PBPs as biomarkers for differentiating between P. Mirabilis L-forms and species of Mycoplasma and Acholeplasma.
• To further elucidate the taxonomic relationship between Mycoplasmatales and bacteria.

Main Methods:

• Isolation and cultivation of P. Mirabilis L-form strains.
• Cultivation of Mycoplasma and Acholeplasma species.
• Assay for the detection of high-affinity penicillin binding proteins.

Main Results:

• Penicillin binding proteins were identified in two strains of the cell wall-less P. Mirabilis L-form.
• Penicillin binding proteins were notably absent from all tested species of Mycoplasma and Acholeplasma.
• The presence of PBPs in P. Mirabilis L-forms and their absence in Mycoplasma/Acholeplasma were consistent findings.

Conclusions:

• The detection of penicillin binding proteins is a viable method for differentiating cell wall-less prokaryotes.
• The absence of PBPs in Mycoplasmatales supports their distinct evolutionary lineage separate from bacteria.
• This study provides a biochemical basis for distinguishing between different groups of wall-less bacteria.