Heme-binding cytochrome domain of fungal cellobiose dehydrogenases. Cellobiose dehydrogenase (CellobioseDH or CDH) is an extracellular fungal oxidoreductase that degrades both lignin and cellulose. Specifically, CDHs oxidize cellobiose, cellodextrins, and lactose to corresponding lactones, utilizing a variety of electron acceptors. Class-II CDHs are monomeric hemoflavoenzymes that are comprised of a b-type cytochrome domain linked to a large flavodehydrogenase domain. The cytochrome domain of CDH and related enzymes, which this model describes, folds as a beta sandwich and complexes a heme molecule. It is found at the N-terminus of this family of enzymes, and belongs to the DOMON domain superfamily, a ligand-interacting motif found in all three kingdoms of life.
Cytochrome domain of cellobiose dehydrogenase. 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.
Eukaryotic cytochrome b(561), including the FRRS1 gene product. Cytochrome b(561), as found in eukaryotes, similar to and including the human FRRS1 gene product (ferric-chelate reductase 1), also called SDR-2 (stromal cell-derived receptor 2). This family comprises a variety of domain architectures, many of which contain dopamine beta-monooxygenase (DOMON) domains. The protein might act as a ferric-chelate reductase, catalyzing the reduction of Fe(3+) to Fe(2+), such as associated with the transport of iron from the endosome to the cytoplasm. It is assumed that this protein uses ascorbate as the electron donor. Belongs to the cytochrome b(561) family, which are secretory vesicle-specific electron transport proteins. Cytochromes b(561) are integral membrane proteins that bind two heme groups non-covalently, and may have six alpha-helical trans-membrane segments.
Eukaryotic cytochrome b(561). Cytochrome b(561) is a family of endosomal or secretory vesicle-specific electron transport proteins. They are integral membrane proteins that bind two heme groups non-covalently, and may have six alpha-helical trans-membrane segments. This is an exclusively eukaryotic family. Members of the prokaryotic cytochrome b561 family are not deemed homologous.
Possible catecholamine-binding domain present in a variety of eukaryotic proteins. A predominantly beta-sheet domain present as a regulatory N-terminal domain in dopamine beta-hydroxylase, mono-oxygenase X and SDR2. Its function remains unknown at present (Ponting, Human Molecular Genetics, in press).
