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Diversity in S-layers.

Chaohua Zhu1, Gang Guo2, Qiqi Ma3

  • 1College of Environment and Plant protection, Hainan University/Key Laboratory of Protection and Development Utilization of Tropical Crop Germplasm Resources (Hainan University), Ministry of Education, Haikou, 570228, Hainan, PR China.

Progress in Biophysics and Molecular Biology
|August 8, 2016
PubMed
Summary
This summary is machine-generated.

Surface layers (S-layers) are crystalline protein arrays on prokaryotic cell surfaces. This review explores their vast diversity in structure, genes, and functions across Archaea and Bacteria.

Keywords:
DiversityFunctionS-layer protein (SLP)S-layer protein geneStructureSurface layers (S-layers)

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Area of Science:

  • Microbiology
  • Biochemistry
  • Structural Biology

Background:

  • Surface layers (S-layers) are ubiquitous crystalline protein or glycoprotein structures found on the exterior of many prokaryotic cells (Archaea and Bacteria).
  • These outermost cell envelope components exhibit remarkable diversity in their arrangement, composition, and associated genes.
  • Their prevalence and unique characteristics have spurred significant research interest over recent decades.

Purpose of the Study:

  • To comprehensively review and illustrate the extensive diversity of S-layers.
  • To examine this diversity from multiple perspectives, including the host organisms, structural variations, protein/gene components, and functional roles.

Main Methods:

  • Literature review and synthesis of existing research on S-layers.
  • Comparative analysis of S-layer characteristics across different prokaryotic taxa.
  • Illustration of structural and functional diversity through examples.

Main Results:

  • S-layers display considerable diversity in the types of strains that carry them, encompassing a wide range of Archaea and Bacteria.
  • Significant variations exist in the structural organization (e.g., lattice symmetry, pore size) and subunit composition (protein vs. glycoprotein) of S-layers.
  • A broad spectrum of functions is associated with S-layers, including cell protection, adhesion, molecular sieving, and enzyme localization.

Conclusions:

  • S-layers represent a highly diverse and functionally versatile cell surface feature in prokaryotes.
  • Understanding S-layer diversity is crucial for appreciating their ecological roles and for potential biotechnological applications.
  • Further research into the genetics and assembly mechanisms will continue to illuminate the evolution and function of these crystalline arrays.