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98  structures 1850  species 0  interactions 2714  sequences 11  architectures

Clan: YqbG (CL0643)


YqbG-like superfamily Add an annotation

This superfamily includes diverse phage proteins. It includes the gp6 head-tail connector proteins from phage HK97 [1]. The clan also includes the P22 accessory factor gp4 [2].

This clan contains 4 families and the total number of domains in the clan is 2714. The clan was built by A Bateman.

Literature references

  1. Cardarelli L, Lam R, Tuite A, Baker LA, Sadowski PD, Radford DR, Rubinstein JL, Battaile KP, Chirgadze N, Maxwell KL, Davidson AR;, J Mol Biol. 2010;395:754-768.: The crystal structure of bacteriophage HK97 gp6: defining a large family of head-tail connector proteins. PUBMED:19895817 EPMC:19895817
  2. Olia AS, Al-Bassam J, Winn-Stapley DA, Joss L, Casjens SR, Cingolani G; , J Mol Biol. 2006;363:558-576.: Binding-induced stabilization and assembly of the phage P22 tail accessory factor gp4. PUBMED:16970964 EPMC:16970964


This clan contains the following 4 member families:

DUF3199 P22_Tail-4 Phage_connect_1 Tube

External database links

Domain organisation

Below is a listing of the unique domain organisations or architectures from this clan. More...

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The table below shows the number of occurrences of each domain throughout the sequence database. More...

Pfam family Num. domains Alignment
Phage_connect_1 (PF05135) 2260 (83.3%) View
Tube (PF17212) 359 (13.2%) View
P22_Tail-4 (PF11650) 69 (2.5%) View
DUF3199 (PF11436) 26 (1.0%) View
Total: 4 Total: 2714 Clan alignment

Please note: Clan alignments can be very large and can cause problems for some browsers. Read the note above before viewing.

Family relationships

This diagram shows the relationships between members of this clan. More...

Species distribution

Tree controls


This tree shows the occurrence of the domains in this clan across different species. More...



For those sequences which have a structure in the Protein DataBank, we use the mapping between UniProt, PDB and Pfam coordinate systems from the MSD group, to allow us to map Pfam domains onto UniProt three-dimensional structures. The table below shows the mapping between the Pfam families in this clan, the corresponding UniProt entries, and the region of the three-dimensional structures that are available for that sequence.

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