CDH-cyt is the cytochrome domain, at the N-terminus, of cellobiose dehydrogenase. CDH-cyt folds as a beta sandwich with the topology of the antibody Fab V(H) domain and binds iron. The haem iron is ligated by Met83 and His181 in UniProtKB:Q01738 [1].

1: A new scaffold for binding haem in the cytochrome domain of the extracellular flavocytochrome cellobiose dehydrogenase. Hallberg BM, Bergfors T, Backbro K, Pettersson G, Henriksson G, Divne C; Structure. 2000;8:79-88. PMID:10673428

2: Ancestral gene fusion in cellobiose dehydrogenases reflects a specific evolution of GMC oxidoreductases in fungi. Zamocky M, Hallberg M, Ludwig R, Divne C, Haltrich D; Gene. 2004;338:1-14. PMID:15302401

3: Cellobiose dehydrogenase--a flavocytochrome from wood-degrading, phytopathogenic and saprotropic fungi. Zamocky M, Ludwig R, Peterbauer C, Hallberg BM, Divne C, Nicholls P, Haltrich D; Curr Protein Pept Sci. 2006;7:255-280. PMID:16787264