The name of this superfamily has been modified since the most recent official CATH+ release (v4_2_0). At the point of the last release, this superfamily was: waiting to be named.

Functional Families

Overview of the Structural Clusters (SC) and Functional Families within this CATH Superfamily. Clusters with a representative structure are represented by a filled circle.

Superfamily: Type IV secretion system, VirB10/TraB/TrbI

Structural domains comprising this superfamily share the structure of the type IV secretion system proteins VirB10, TraB and TrbI. All of this are part of the different DNA transfer systems the tumour-inducing (Ti) plasmid of Agrobacterium tumefaciens encodes where the virB operon is required for DNA transfer to the plant host and the tra/trb systems are required for conjugal transfer of the Ti plasmid between cells of Agrobacterium PMID:12169609.

The trbI gene encodes an intrinsic inner-membrane protein that is 128-amino-acids long. Although it is not essential for conjugational transfer, the TrbI protein greatly increases conjugational efficiency as it is believed to influence the kinetics of pilus outgrowth and/or retraction PMID:1355084.

GO Diversity

Unique GO annotations
6 Unique GO terms

EC Diversity

Unique EC annotations
3 Unique EC terms

Species Diversity

Unique species annotations
2708 Unique species

Sequence/Structure Diversity

Overview of the sequence / structure diversity of this superfamily compared to other superfamilies in CATH. Click on the chart to view the data in more detail.

Superfamily Summary

A general summary of information for this superfamily.
Domains: 20
Domain clusters (>95% seq id): 2
Domain clusters (>35% seq id): 2
Unique PDBs: 2
Structural Clusters (5A): 1
Structural Clusters (9A): 1
FunFam Clusters: 0
Unique EC: 3
Unique GO: 6
Unique Species: 2708