8CW4 image
Deposition Date 2022-05-18
Release Date 2023-02-01
Last Version Date 2024-06-12
Entry Detail
PDB ID:
8CW4
Keywords:
STRUCTURAL PROTEIN
Title:
CryoEM structure of the N-pilus from Escherichia coli
Biological Source:
Source Organism:
Escherichia coli (Taxon ID: 562)
Host Organism:
Escherichia coli
Method Details:
Experimental Method:
ELECTRON MICROSCOPY
Resolution:
3.00 Å
Aggregation State:
HELICAL ARRAY
Reconstruction Method:
SINGLE PARTICLE
8CW4 validation report
Macromolecular Entities
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Conjugal transfer protein TraM
Gene (Uniprot):traM
Chain IDs:A (auth: 1A), B (auth: 1B), C (auth: 1C), D (auth: 1D), E (auth: 1E), F (auth: 1F), G (auth: 1G), H (auth: 1H), I (auth: 1I), J (auth: 1J), K (auth: 1K), L (auth: 1L), M (auth: 1M), N (auth: 1N), O (auth: 2A), P (auth: 2B), Q (auth: 2C), R (auth: 2D), S (auth: 2E), T (auth: 2F), U (auth: 2G), V (auth: 2H), W (auth: 2I), X (auth: 2J), Y (auth: 2K), Z (auth: 2L), AA (auth: 2M), BA (auth: 2N), CA (auth: 3A), DA (auth: 3B), EA (auth: 3C), FA (auth: 3D), GA (auth: 3E), HA (auth: 3F), IA (auth: 3G), JA (auth: 3H), KA (auth: 3I), LA (auth: 3J), MA (auth: 3K), NA (auth: 3L), OA (auth: 3M), PA (auth: 3N), QA (auth: 4A), RA (auth: 4B), SA (auth: 4C), TA (auth: 4D), UA (auth: 4E), VA (auth: 4F), WA (auth: 4G), XA (auth: 4H), YA (auth: 4I), ZA (auth: 4J), AB (auth: 4K), BB (auth: 4L), CB (auth: 4M), DB (auth: 4N), EB (auth: 5A), FB (auth: 5B), GB (auth: 5C), HB (auth: 5D), IB (auth: 5E), JB (auth: 5F), KB (auth: 5G), LB (auth: 5H), MB (auth: 5I), NB (auth: 5J), OB (auth: 5K), PB (auth: 5L), QB (auth: 5M), RB (auth: 5N)
Chain Length:97
Number of Molecules:70
Biological Source:Escherichia coli
UniProt ID:Q46696 Pfam ID:PF04956
Ligand Molecules
PGW
Primary Citation
Cryo-EM structure of the Agrobacterium tumefaciens T-pilus reveals the importance of positive charges in the lumen.
Structure 31 375 384.e4 (2023)
PMID: 36513067 DOI: 10.1016/j.str.2022.11.007

Abstact

Agrobacterium tumefaciens is a natural genetic engineer that transfers DNA into plants, which is the most applied process for generation of genetically modified plants. DNA transfer is mediated by a type IV secretion system in the cell envelope and extracellular T-pili. We here report the cryo-electron microscopic structures of the T-pilus at 3.2-Å resolution and of the plasmid pKM101-determined N-pilus at 3-Å resolution. Both pili contain a main pilus protein (VirB2 in A. tumefaciens, TraM in pKM101) and phospholipids arranged in a five-start helical assembly. They contain positively charged amino acids in the lumen, and the lipids are positively charged in the T-pilus (phosphatidylcholine) conferring overall positive charge. Mutagenesis of the lumen-exposed Arg91 in VirB2 results in protein destabilization and loss of pilus formation. Our results reveal that different phospholipids can be incorporated into type IV secretion pili and that the charge of the lumen may be of functional importance.

Legend

Protein

Chemical

Disease

Primary Citation of related structures
8CUE