8CKA image
Entry Detail
PDB ID:
8CKA
EMDB ID:
Title:
Deinococcus radidurans HPI S-layer
Biological Source:
PDB Version:
Deposition Date:
2023-02-14
Release Date:
2023-04-19
Method Details:
Experimental Method:
Resolution:
2.52 Å
Aggregation State:
2D ARRAY
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Hexagonally packed intermediate-layer surface protein
Chain IDs:A, B
Chain Length:948
Number of Molecules:2
Biological Source:Deinococcus radiodurans (strain ATCC 13939 / DSM 20539 / JCM 16871 / LMG 4051 / NBRC 15346 / NCIMB 9279 / R1 / VKM B-1422)
Ligand Molecules
Primary Citation
Interdigitated immunoglobulin arrays form the hyperstable surface layer of the extremophilic bacterium Deinococcus radiodurans.
Proc.Natl.Acad.Sci.USA 120 e2215808120 e2215808120 (2023)
PMID: 37043530 DOI: 10.1073/pnas.2215808120

Abstact

Deinococcus radiodurans is an atypical diderm bacterium with a remarkable ability to tolerate various environmental stresses, due in part to its complex cell envelope encapsulated within a hyperstable surface layer (S-layer). Despite decades of research on this cell envelope, atomic structural details of the S-layer have remained obscure. In this study, we report the electron cryomicroscopy structure of the D. radiodurans S-layer, showing how it is formed by the Hexagonally Packed Intermediate-layer (HPI) protein arranged in a planar hexagonal lattice. The HPI protein forms an array of immunoglobulin-like folds within the S-layer, with each monomer extending into the adjacent hexamer, resulting in a highly interconnected, stable, sheet-like arrangement. Using electron cryotomography and subtomogram averaging from focused ion beam-milled D. radiodurans cells, we have obtained a structure of the cellular S-layer, showing how this HPI S-layer coats native membranes on the surface of cells. Our S-layer structure from the diderm bacterium D. radiodurans shows similarities to immunoglobulin-like domain-containing S-layers from monoderm bacteria and archaea, highlighting common features in cell surface organization across different domains of life, with connotations on the evolution of immunoglobulin-based molecular recognition systems in eukaryotes.

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Primary Citation of related structures