Fold: Multiheme cytochromes

variable number of helices and little beta structure; not a true fold

Lineage:

1. Root: scop
2. Class: All alpha proteins
3. Fold: Multiheme cytochromes
   variable number of helices and little beta structure; not a true fold

Superfamilies:

1. Multiheme cytochromes (3)
   duplication: contains multiple CxxCH motifs
   1. Cytochrome c3-like (7)
   2. Photosynthetic reaction centre (cytochrome subunit) (2)
      consists of four heme-binding repeats
   3. Di-heme elbow motif (7)
      the main characteristic feature of this motif is the packing of its two hemes
      contains one or more complete motifs flanked by incomplete motifs and/or other domains