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Spirochetes, unique bacteria in the phylum Spirochaetes, are gram-negative, motile, tightly coiled, slender, and flexible. They inhabit aquatic sediments and animals, with some causing diseases like syphilis. Spirochetes are classified into eight genera based on habitat, pathogenicity, phylogeny, and characteristics.Their distinctive motility arises from endoflagella, located within the cell’s periplasm. These endoflagella anchor at the cell poles and extend along the cell length, encased...
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Exploring Spiroplasma Biology: Opportunities and Challenges.

Shrikant Harne1, Pananghat Gayathri1, Laure Béven2

  • 1Indian Institute of Science Education and Research, Pune, India.

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|November 16, 2020
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Summary

Spiroplasmas, helical bacteria lacking cell walls, offer unique insights into bacterial shape and division. Studying their MreB and FtsZ proteins advances understanding of fundamental bacterial mechanisms.

Keywords:
MreBSpiroplasmaSpiroplasma geneticsbacterial cytoskeletonbacterial divisionfibrilmotilityshape determination

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Area of Science:

  • Microbiology
  • Cell Biology
  • Bacteriology

Background:

  • Spiroplasmas are unique cell-wall-deficient bacteria within the Mollicutes class, known for their helical shape and motility without external appendages.
  • Existing models of bacterial shape and division in cell-walled bacteria emphasize cell wall synthesis, MreB, and FtsZ, though their precise roles remain debated.

Purpose of the Study:

  • To compare and contrast motility, shape determination, and cytokinesis in Spiroplasma with other Mollicutes and cell-walled bacteria.
  • To highlight Spiroplasma as a model organism for investigating the roles of MreB and FtsZ in bacterial shape and division in the absence of a cell wall.

Main Methods:

  • Comparative analysis of motility, shape determination, and cytokinesis mechanisms.
  • Review of existing literature and models for bacterial cell structure and division.
  • Discussion of emerging technologies applicable to Spiroplasma research.

Main Results:

  • Spiroplasmas possess MreB proteins, exhibit helical morphology linked to rod shape, and undergo FtsZ-dependent division.
  • The absence of a cell wall in Spiroplasma provides a distinct system to study cytoskeletal protein functions.

Conclusions:

  • Spiroplasmas are valuable models for deciphering the fundamental roles of MreB and FtsZ in bacterial shape determination and cytokinesis.
  • Advancements in genomics, gene editing, and advanced microscopy are crucial for overcoming genetic manipulation challenges and understanding Spiroplasma biology.