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Structure paper

TitleStructure and mechanism of DNA delivery of a gene transfer agent.
Journal, issue, pagesNat Commun, Vol. 11, Issue 1, Page 3034, Year 2020
Publish dateJun 15, 2020
AuthorsPavol Bárdy / Tibor Füzik / Dominik Hrebík / Roman Pantůček / J Thomas Beatty / Pavel Plevka /
PubMed AbstractAlphaproteobacteria, which are the most abundant microorganisms of temperate oceans, produce phage-like particles called gene transfer agents (GTAs) that mediate lateral gene exchange. However, the ...Alphaproteobacteria, which are the most abundant microorganisms of temperate oceans, produce phage-like particles called gene transfer agents (GTAs) that mediate lateral gene exchange. However, the mechanism by which GTAs deliver DNA into cells is unknown. Here we present the structure of the GTA of Rhodobacter capsulatus (RcGTA) and describe the conformational changes required for its DNA ejection. The structure of RcGTA resembles that of a tailed phage, but it has an oblate head shortened in the direction of the tail axis, which limits its packaging capacity to less than 4,500 base pairs of linear double-stranded DNA. The tail channel of RcGTA contains a trimer of proteins that possess features of both tape measure proteins of long-tailed phages from the family Siphoviridae and tail needle proteins of short-tailed phages from the family Podoviridae. The opening of a constriction within the RcGTA baseplate enables the ejection of DNA into bacterial periplasm.
External linksNat Commun / PubMed:32541663 / PubMed Central
MethodsEM (single particle) / EM (helical sym.)
Resolution3.32 - 10.47 Å
Structure data

EMDB-10442, PDB-6tb9:
Capsid of native GTA particle computed with C5 symmetry
Method: EM (single particle) / Resolution: 3.56 Å

EMDB-10443, PDB-6tba:
Virion of native gene transfer agent (GTA) particle
Method: EM (single particle) / Resolution: 4.54 Å

EMDB-10476, PDB-6te8:
Neck of native GTA particle computed with C12 symmetry
Method: EM (single particle) / Resolution: 3.32 Å

EMDB-10477, PDB-6te9:
Neck of native GTA particle computed with C6 symmetry
Method: EM (single particle) / Resolution: 3.58 Å

EMDB-10478, PDB-6tea:
Tail of native GTA particle computed with helical refinement, C6 symmetry
Method: EM (helical sym.) / Resolution: 3.89 Å

EMDB-10479, PDB-6teb:
Tail-baseplate interface of native GTA particle computed with C6 symmetry
Method: EM (single particle) / Resolution: 4.14 Å

EMDB-10490, PDB-6teh:
Baseplate of native GTA particle computed with C3 symmetry
Method: EM (single particle) / Resolution: 3.99 Å

EMDB-10541, PDB-6to8:
Neck of empty GTA particle computed with C12 symmetry
Method: EM (single particle) / Resolution: 3.36 Å

EMDB-10542, PDB-6toa:
Neck of empty GTA particle computed with C6 symmetry
Method: EM (single particle) / Resolution: 3.47 Å

EMDB-10565, PDB-6tsu:
Capsid of empty GTA particle computed with C5 symmetry
Method: EM (single particle) / Resolution: 3.42 Å

EMDB-10566, PDB-6tsv:
Tail of empty GTA particle computed with helical refinement, C6 symmetry
Method: EM (helical sym.) / Resolution: 3.78 Å

EMDB-10567, PDB-6tsw:
Isometric capsid of empty GTA particle computed with I4(I,n25r) symmetry
Method: EM (single particle) / Resolution: 4.03 Å

EMDB-10568:
Capsid-neck interface of native GTA particle, asymmetric reconstruction
Method: EM (single particle) / Resolution: 4.25 Å

EMDB-10569:
Capsid-neck interface of empty GTA particle, asymmetric reconstruction
Method: EM (single particle) / Resolution: 4.15 Å

EMDB-10570:
Tail tube of native GTA particle computed with C3 symmetry
Method: EM (single particle) / Resolution: 4.54 Å

EMDB-10571:
Baseplate of empty GTA particle computed with C3 symmetry
Method: EM (single particle) / Resolution: 4.49 Å

EMDB-10572:
Baseplate of native GTA particle, asymmetric reconstruction
Method: EM (single particle) / Resolution: 4.56 Å

EMDB-10592, PDB-6tui:
Virion of empty GTA particle
Method: EM (single particle) / Resolution: 10.47 Å

Chemicals

ChemComp-SF4:
IRON/SULFUR CLUSTER / Iron–sulfur cluster

Source
  • rhodobacter capsulatus (bacteria)
  • rhodobacter capsulatus sb 1003 (bacteria)
  • rhodobacter capsulatus de442 (bacteria)
KeywordsVIRUS / "capsid" / "gene transfer agent" / "bacteriophage" / "HK97" / "virion" / "horizontal gene transfer" / "gene delivery" / "portal" / "adaptor" / "neck" / "tail tube" / "helical refinement" / "tape measure protein" / "distal tail protein" / "oligosaccharide-binding fold" / "tail tube protein" / "baseplate" / "tail" / "hub" / "connector" / "jelly roll" / "spike" / "mutant" / "variant" / "genome release"

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