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TitleThe Plasticity of Molecular Interactions Governs Bacterial Microcompartment Shell Assembly.
Journal, issue, pagesStructure, Vol. 27, Issue 5, Page 749-763.e4, Year 2019
Publish dateMay 7, 2019
AuthorsBasil J Greber / Markus Sutter / Cheryl A Kerfeld /
PubMed AbstractBacterial microcompartments (BMCs) are composed of an enzymatic core encapsulated by a selectively permeable protein shell that enhances catalytic efficiency. Many pathogenic bacteria derive ...Bacterial microcompartments (BMCs) are composed of an enzymatic core encapsulated by a selectively permeable protein shell that enhances catalytic efficiency. Many pathogenic bacteria derive competitive advantages from their BMC-based catabolism, implicating BMCs as drug targets. BMC shells are of interest for bioengineering due to their diverse and selective permeability properties and because they self-assemble. A complete understanding of shell composition and organization is a prerequisite for biotechnological applications. Here, we report the cryoelectron microscopy structure of a BMC shell at 3.0-Å resolution, using an image-processing strategy that allowed us to determine the previously uncharacterized structural details of the interactions formed by the BMC-T and BMC-T shell subunits in the context of the assembled shell. We found unexpected structural plasticity among these interactions, resulting in distinct shell populations assembled from varying numbers of the BMC-T and BMC-T subunits. We discuss the implications of these findings on shell assembly and function.
External linksStructure / PubMed:30833088 / PubMed Central
MethodsEM (single particle)
Resolution3.0 - 4.4 Å
Structure data

EMDB-9296:
Cryo-EM structure of the HO BMC shell: Fully asymmetric reconstruction
Method: EM (single particle) / Resolution: 4.4 Å

EMDB-9307: Structure of the HO BMC shell: BMC-TD focused structure, closed state
PDB-6mzu: Cryo-EM structure of the HO BMC shell: BMC-TD focused structure, closed state
Method: EM (single particle) / Resolution: 3.4 Å

EMDB-9308, PDB-6mzv:
Cryo-EM structure of the HO BMC shell: BMC-TD focused structure, widened inner ring
Method: EM (single particle) / Resolution: 3.4 Å

EMDB-9309, PDB-6mzx:
Cryo-EM structure of the HO BMC shell: Icosahedral reconstruction (main population)
Method: EM (single particle) / Resolution: 3.0 Å

EMDB-9310, PDB-6mzy:
Cryo-EM structure of the HO BMC shell: Icosahedral reconstruction of the compacted subpopulation
Method: EM (single particle) / Resolution: 3.3 Å

EMDB-9311, PDB-6n06:
Cryo-EM structure of the HO BMC shell: BMC-T1 in the assembled shell
Method: EM (single particle) / Resolution: 3.4 Å

EMDB-9312, PDB-6n07:
Structure of the HO BMC shell: BMC-TD focused map, open inner pore, compacted shell
Method: EM (single particle) / Resolution: 3.6 Å

EMDB-9313, PDB-6n09:
Cryo-EM structure of the HO BMC shell: subregion classified for BMC-T: TD-TDTDTD
Method: EM (single particle) / Resolution: 3.5 Å

EMDB-9314, PDB-6n0f:
Cryo-EM structure of the HO BMC shell: subregion classified for BMC-T: TD-TSTSTS
Method: EM (single particle) / Resolution: 3.9 Å

EMDB-9315, PDB-6n0g:
Cryo-EM structure of the HO BMC shell: subregion classified for BMC-T: TS-TDTDTD
Method: EM (single particle) / Resolution: 3.6 Å

Source
  • haliangium ochraceum (bacteria)
  • haliangium ochraceum (strain dsm 14365 / jcm 11303 / smp-2) (bacteria)
  • haliangium ochraceum dsm 14365 (bacteria)
KeywordsSTRUCTURAL PROTEIN / microcompartment / shell / compartmentalization / BMC fold / VIRUS LIKE PARTICLE

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