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The protein complexes that form the mitochondrial electron transport system (the respiratory chain), associated with the inner mitochondrial membrane. The respiratory chain complexes transfer electrons from an electron donor to an electron acceptor and are associated with a proton pump to create a transmembrane electrochemical gradient. Either of the lipid bilayers that surround the mitochondrion and form the mitochondrial envelope. A protein complex located in the mitochondrial inner membrane that forms part of the mitochondrial respiratory chain. It contains about 25 different polypeptide subunits, including NADH dehydrogenase (ubiquinone), flavin mononucleotide and several different iron-sulfur clusters containing non-heme iron. The iron undergoes oxidation-reduction between Fe(II) and Fe(III), and catalyzes proton translocation linked to the oxidation of NADH by ubiquinone. Any constituent part of a mitochondrion, a semiautonomous, self replicating organelle that occurs in varying numbers, shapes, and sizes in the cytoplasm of virtually all eukaryotic cells. It is notably the site of tissue respiration. Any constituent part of a mitochondrial membrane, either of the lipid bilayers that surround the mitochondrion and form the mitochondrial envelope. The protein complexes that form the electron transport system (the respiratory chain), associated with a cell membrane, usually the plasma membrane (in prokaryotes) or the inner mitochondrial membrane (on eukaryotes). The respiratory chain complexes transfer electrons from an electron donor to an electron acceptor and are associated with a proton pump to create a transmembrane electrochemical gradient. The inner, i.e. lumen-facing, lipid bilayer of the mitochondrial envelope. It is highly folded to form cristae. The peripheral segment of respiratory chain complex I located in the mitochondrion. Respiratory chain complex I is an enzyme of the respiratory chain, consisting of at least 34 polypeptide chains. The electrons of NADH enter the chain at this complex. The complete complex is L-shaped, with a horizontal arm lying in the membrane and a vertical arm that projects into the matrix. An integral membrane complex that possesses NADH oxidoreductase activity. The complex is one of the components of the electron transport chain. It catalyzes the transfer of a pair of electrons from NADH to a quinone. Any constituent part of a membrane, a double layer of lipid molecules that encloses all cells, and, in eukaryotes, many organelles; may be a single or double lipid bilayer; also includes associated proteins. The mitochondrial membrane segment of respiratory chain complex I. Respiratory chain complex I is an enzyme of the respiratory chain, consisting of at least 34 polypeptide chains. The electrons of NADH enter the chain at this complex. The complete complex is L-shaped, with a horizontal arm lying in the membrane and a vertical arm that projects into the matrix. Respiratory chain complex I is an enzyme of the respiratory chain. It consists of at least 34 polypeptide chains and is L-shaped, with a horizontal arm lying in the membrane and a vertical arm that projects into the matrix. The electrons of NADH enter the chain at this complex.

View Gene Ontology (GO) Term

GO TERM SUMMARY
Name: mitochondrial respiratory chain complex I
Acc: GO:0005747
Aspect: Cellular Component
Desc: A protein complex located in the mitochondrial inner membrane that forms part of the mitochondrial respiratory chain. It contains about 25 different polypeptide subunits, including NADH dehydrogenase (ubiquinone), flavin mononucleotide and several different iron-sulfur clusters containing non-heme iron. The iron undergoes oxidation-reduction between Fe(II) and Fe(III), and catalyzes proton translocation linked to the oxidation of NADH by ubiquinone.
Synonyms:
  • GO:0005748
Proteins in PDR annotated with:
   This term: 125 [Search]
   Term or descendants: 125 [Search]


[geneontology.org]
INTERACTIVE GO GRAPH

GO:0005747 - mitochondrial respiratory chain complex I (interactive image map)
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