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Sample Preparation using a Lipid Monolayer Method for Electron Crystallographic Studies
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Complete atomic structure of a native archaeal cell surface.

Andriko von Kügelgen1, Vikram Alva2, Tanmay A M Bharat3

  • 1Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, UK.

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|November 24, 2021
PubMed
Summary
This summary is machine-generated.

The atomic structure of the archaeal surface layer (S-layer) from Haloferax volcanii was determined. This reveals a hexagonal protein array and pentameric defects, offering insights into archaeal cell surface organization.

Keywords:
S-layerarchaeacell surfacecryo-EMcryo-ETimmunoglobulin domainprotein evolutionsub-tomogram averagingsurface layertomography

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Area of Science:

  • Microbiology
  • Structural Biology
  • Biochemistry

Background:

  • Prokaryotic cells often feature an outer S-layer composed of protein macromolecules.
  • S-layers are crucial for cellular functions including protection and environmental interaction.

Purpose of the Study:

  • To determine the atomic structure of the S-layer from the archaeal model organism Haloferax volcanii.
  • To elucidate the structural basis of S-layer assembly and cell surface organization in archaea.

Main Methods:

  • Electron cryomicroscopy (cryo-EM) of two-dimensional S-layer sheets.
  • Cellular cryo-tomography.
  • Atomic structure determination.

Main Results:

  • The S-layer is a hexagonal array of immunoglobulin-like domains, common in archaeal S-layer proteins (SLPs).
  • Cellular tomography showed a nearly continuous S-layer with pentameric defects.
  • The atomic structure of the pentameric defect revealed distinct domain arrangements.

Conclusions:

  • Structural data provide atomic-level understanding of the Haloferax volcanii S-layer.
  • The findings offer a framework for comprehending archaeal cell surface structures and their assembly.
  • Identified immunoglobulin-like domains and pentameric defects are key to S-layer organization.