SCOP

The full SCOP record for 2POR can be found on the SCOP website. Here is the classification of the protein by SCOP, from the most general (Root) to the most specific (Protein).

• Root: scop
• Class: Membrane and cell surface proteins and peptides
• Does not include proteins in the immune system
• Fold: Transmembrane beta-barrels
  not a true fold, gathers together transmembrane barrels of different (n,S)
• Superfamily: Porins
• Family: Porin
  trimer, one subunit folds into (16,20) barrel
• Protein: Porin
• Species: Rhodobacter capsulatus
• PDB Entry Domains:
  2por -- complexed with ca, ote
  3por -- complexed with ote, trs

SCOP lists several other known porin proteins, including those from Escherichia coli, Rhodopseudomonas blastica, Klebsiella pneumoniae, and Comamonas acidovorans.

At the Superfamily level, there are two types of proteins with structures similar to Porins. They are maltoporin-like proteins and ligand-gated protein channels.

CATH

The full CATH record can be found on the CATH website. Here is the classification of the protein by CATH:

• Class: Mainly Beta
• Architecture: Barrel
• Topology: Porin
• Homologous Superfamily: INTEGRAL MEMBRANE PROTEIN PORIN
• Sequence Family: INTEGRAL MEMBRANE PROTEIN PORIN
• Non-identical Relatives: INTEGRAL MEMBRANE PROTEIN PORIN
• Identical Relatives: INTEGRAL MEMBRANE PROTEIN PORIN

In the CATH classification, there are no near relatives for 2POR in the non-identical relatives or sequence relatives. In the Homologous Superfamilies, though, there are three similar proteins. They are, in order of similarity: 1prn, 1pho, and 1e54. 1prn turns out to be the porin from Rhodopseudomonas blastica, which is also mentioned in the CATH classification. 1pho is the porin from Escherichia coli and 1e54 is the porin from Comamonas acidovorans.

Moving up the tree from the Homologous Superfamily, the CATH classification does not list any other Topologies within the Barrel architecture. At the Barrel classification level, though, there are 25 different topologies within the Barrel architecture (full details).