Required for the assembly of mitochondrial cytochrome c oxidase. Cryptococcus neoformans var. neoformans serotype D (strain JEC21 / ATCC MYA-565) (taxid: 214684)
>sp|P0CM87|COX19_CRYNB Cytochrome c oxidase assembly protein COX19 OS=Cryptococcus neoformans var. neoformans serotype D (strain B-3501A) GN=COX19 PE=3 SV=1
>gi|255549886|ref|XP_002515994.1| Cytochrome c oxidase assembly protein COX19, putative [Ricinus communis] gi|223544899|gb|EEF46414.1| Cytochrome c oxidase assembly protein COX19, putative [Ricinus communis]
>gi|195637134|gb|ACG38035.1| cytochrome c oxidase assembly protein COX19 [Zea mays] gi|195652211|gb|ACG45573.1| cytochrome c oxidase assembly protein COX19 [Zea mays]
we have identified a conserved motif in the LOC118487 protein that we have called the CHCH motif. Alignment of this protein with related members showed the presence of three subgroups of proteins, which are called the S (Small), N (N-terminal extended) and C (C-terminal extended) subgroups. All three sub-groups of proteins have in common that they contain a predicted conserved [coiled coil 1]-[helix 1]-[coiled coil 2]-[helix 2] domain (CHCH domain). Within each helix of the CHCH domain, there are two cysteines present in a C-X9-C motif. The N-group contains an additional double helix domain, and each helix contains the C-X9-C motif. This family contains a number of characterized proteins: Cox19 protein - a nuclear gene of Saccharomyces cerevisiae, codes for an 11-kDa protein (Cox19p) required for expression of cytochrome oxidase. Because cox19 mutants are able to synthesise the mitochondrial and nuclear gene products of cytochrome oxidase, Cox19p probably functions post-translationally during assembly of the enzyme. Cox19p is present in the cytoplasm and mitochondria, where it exists as a soluble intermembrane protein. This dual location is similar to what was previously reported for Cox17p, a low molecular weight copper protein thought to be required for maturation of the CuA centre of subunit 2 of cytochrome oxidase. Cox19p have four conserved potential metal ligands, these are three cysteines and one histidine. Mrp10 - belongs to the class of yeast mitochondrial ribosomal proteins that are essential for translation. Eukaryotic NADH-ubiquinone oxidoreductase 19 kDa (NDUFA8) subunit. The CHCH domain was previously called DUF657. Length = 35
Alignment of this protein with related members showed the presence of three subgroups of proteins, which are called the S (Small), N (N-terminal extended) and C (C-terminal extended) subgroups. All three sub-groups of proteins have in common that they contain a predicted conserved [coiled coil 1]-[helix 1]-[coiled coil 2]-[helix 2] domain (CHCH domain). Within each helix of the CHCH domain, there are two cysteines present in a C-X9-C motif. The N-group contains an additional double helix domain, and each helix contains the C-X9-C motif. This family contains a number of characterised proteins: Cox19 protein - a nuclear gene of Saccharomyces cerevisiae, codes for an 11 kDa protein (Cox19p) required for expression of cytochrome oxidase. Because cox19 mutants are able to synthesise the mitochondrial and nuclear gene products of cytochrome oxidase, Cox19p probably functions post-translationally during assembly of the enzyme. Cox19p is present in the cytoplasm and mitochondria, where it exists as a soluble intermembrane protein. This dual location is similar to what was previously reported for Cox17p, a low molecular weight copper protein thought to be required for maturation of the CuA centre of subunit 2 of cytochrome oxidase. Cox19p have four conserved potential metal ligands, these are three cysteines and one histidine. Mrp10 - belongs to the class of yeast mitochondrial ribosomal proteins that are essential for translation []. Eukaryotic NADH-ubiquinone oxidoreductase 19 kDa (NDUFA8) subunit []. The CHCH domain was previously called DUF657 []. ; PDB: 2ZXT_A 3A3C_A 2L0Y_A 2K3J_A.
>KOG4695 consensus Uncharacterized conserved protein [Function unknown]
>PF08991 DUF1903: Domain of unknown function (DUF1903); InterPro: IPR009069 The mature-T-cell-proliferation (MTCP1) putative oncogene was identified for its involvement in t(X:14)(q28;q11)-associated T-cell leukaemia []
MTCP1 is alternatively spliced to produce two completely distinct proteins: the small mitochondrial protein, p8MTCP1, and the protein p13MTCP1, which shows strong homology to another oncogene product, p14TCL1. While p13MTCP1 expression appears to be restricted to mature T-cell proliferation with t(X,14) translocations, the mitochondrial p8MTCP1 is expressed at low levels in most human tissues, and is over-expressed in the proliferating T-cells. The biological function of p8MTCP1 is still unknown, but it appears to play a role in oncogenesis. The structure of p8MTCP1 reveals a disulphide-rich, irregular array of three helices [].; PDB: 2HP8_A 1EI0_A 1HP8_A.
>cd00926 Cyt_c_Oxidase_VIb Cytochrome c oxidase subunit VIb
Cytochrome c oxidase (CcO), the terminal oxidase in the respiratory chains of eukaryotes and most bacteria, is a multi-chain transmembrane protein located in the inner membrane of mitochondria and the cell membrane of prokaryotes. It catalyzes the reduction of O2 and simultaneously pumps protons across the membrane. The number of subunits varies from three to five in bacteria and up to 13 in mammalian mitochondria. Subunits I, II, and III of mammalian CcO are encoded within the mitochondrial genome and the remaining 10 subunits are encoded within the nuclear genome. Found only in eukaryotes, subunit VIb is one of three mammalian subunits that lacks a transmembrane region. It is located on the cytosolic side of the membrane and helps form the dimer interface with the corresponding subunit on the other monomer complex.
>KOG4618 consensus Uncharacterized conserved protein [Function unknown]
6.5.3 from EC) is a respiratory-chain enzyme that catalyses the transfer of two electrons from NADH to ubiquinone in a reaction that is associated with proton translocation across the membrane (NADH + ubiquinone = NAD+ + ubiquinol) []. Complex I is a major source of reactive oxygen species (ROS) that are predominantly formed by electron transfer from FMNH(2). Complex I is found in bacteria, cyanobacteria (as a NADH-plastoquinone oxidoreductase), archaea [], mitochondira, and in the hydrogenosome, a mitochondria-derived organelle. In general, the bacterial complex consists of 14 different subunits, while the mitochondrial complex contains homologues to these subunits in addition to approximately 31 additional proteins []. Mitochondrial complex I, which is located in the inner mitochondrial membrane, is the largest multimeric respiratory enzyme in the mitochondria, consisting of more than 40 subunits, one FMN co-factor and eight FeS clusters []. The assembly of mitochondrial complex I is an intricate process that requires the cooperation of the nuclear and mitochondrial genomes [, ]. Mitochondrial complex I can cycle between active and deactive forms that can be distinguished by the reactivity towards divalent cations and thiol-reactive agents. All redox prosthetic groups reside in the peripheral arm of the L-shaped structure. The NADH oxidation domain harbouring the FMN cofactor is connected via a chain of iron-sulphur clusters to the ubiquinone reduction site that is located in a large pocket formed by the PSST and 49kDa subunits of complex I []. This family consists of several NADH-ubiquinone oxidoreductase B18 subunit proteins from different eukaryotic organisms. Oxidative phosphorylation is the well-characterised process in which ATP, the principal carrier of chemical energy of individual cells, is produced due to a mitochondrial proton gradient formed by the transfer of electrons from NADH and FADH2 to molecular oxygen. The oxidative phosphorylation (OXPHOS) system is located in the mitochondrial inner membrane and consists of five multi-subunit enzyme complexes and two small electron carriers: coenzyme Q10 and cytochrome C. At least 70 structural proteins involved in the formation of the whole OXPHOS system are encoded by nuclear genes, whereas 13 structural proteins are encoded by the mitochondrial genome. Deficiency of NADH ubiquinone oxidoreductase, the first enzyme complex of the mitochondrial respiratory chain, is one of the most frequent causes of Homo sapiens mitochondrial encephalomyopathies [].; GO: 0003954 NADH dehydrogenase activity, 0008137 NADH dehydrogenase (ubiquinone) activity, 0005739 mitochondrion
>PF02297 COX6B: Cytochrome oxidase c subunit VIb; InterPro: IPR003213 Cytochrome c oxidase (1
9.3.1 from EC) is an oligomeric enzymatic complex that is a component of the respiratory chain complex and is involved in the transfer of electrons from cytochrome c to oxygen []. In eukaryotes this enzyme complex is located in the mitochondrial inner membrane; in aerobic prokaryotes it is found in the plasma membrane. In eukaryotes, in addition to the three large subunits, I, II and III, that form the catalytic centre of the enzyme complex, there are a variable number of small polypeptide subunits. One of these subunits is the potentially haem-binding subunit, VIb, which is encoded in the nucleus []. ; GO: 0004129 cytochrome-c oxidase activity, 0005739 mitochondrion; PDB: 1OCC_U 1OCR_U 2DYS_H 3ASO_H 3AG3_U 2EIL_H 2EIJ_U 3AG2_U 3ABM_U 2EIN_U ....
>PF10203 Pet191_N: Cytochrome c oxidase assembly protein PET191; InterPro: IPR018793 This entry represents a family of conserved proteins found from nematodes to humans
Cytochrome c oxidase assembly protein Pet191 carries six highly conserved cysteine residues. Pet191 is required for the assembly of active cytochrome c oxidase but does not form part of the final assembled complex [].
