| GOID Link to GO |
Functional Category | Description | Protein Count link to protein list |
|---|---|---|---|
| GO:0005743 | mitochondrial inner membrane | The inner, i.e. lumen-facing, lipid bilayer of the mitochondrial envelope. It is highly folded to form cristae. | 500 |
| GO:0005759 | mitochondrial matrix | The gel-like material, with considerable fine structure, that lies in the matrix space, or lumen, of a mitochondrion. It contains the enzymes of the tricarboxylic acid cycle and, in some organisms, the enzymes concerned with fatty acid oxidation. | 388 |
| GO:0005741 | mitochondrial outer membrane | The outer, i.e. cytoplasm-facing, lipid bilayer of the mitochondrial envelope. | 310 |
| GO:0042645 | mitochondrial nucleoid | The region of a mitochondrion to which the DNA is confined. | 281 |
| GO:0005758 | mitochondrial intermembrane space | The region between the inner and outer lipid bilayers of the mitochondrial envelope. | 210 |
| GO:0005740 | mitochondrial envelope | The double lipid bilayer enclosing the mitochondrion and separating its contents from the cell cytoplasm; includes the intermembrane space. | 97 |
| GO:0005747 | mitochondrial respiratory chain complex I | 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. | 93 |
| GO:0031307 | integral to mitochondrial outer membrane | Located such that some or all of the gene product itself penetrates at least one phospholipid bilayer of the mitochondrial outer membrane. May also refer to the state of being buried in the bilayer with no exposure outside the bilayer. | 83 |
| GO:0031966 | mitochondrial membrane | Either of the lipid bilayers that surround the mitochondrion and form the mitochondrial envelope. | 70 |
| GO:0005753 | mitochondrial proton-transporting ATP synthase complex | A proton-transporting ATP synthase complex found in the mitochondrial membrane. | 59 |
| GO:0030061 | mitochondrial crista | Any of the inward folds of the mitochondrial inner membrane. Their number, extent, and shape differ in mitochondria from different tissues and organisms. They appear to be devices for increasing the surface area of the mitochondrial inner membrane, where the enzymes of electron transport and oxidative phosphorylation are found. Their shape can vary with the respiratory state of the mitochondria. | 42 |
| GO:0044429 | mitochondrial part | 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. | 39 |
| GO:0031305 | integral to mitochondrial inner membrane | Located such that some or all of the gene product itself penetrates at least one phospholipid bilayer of the mitochondrial inner membrane. May also refer to the state of being buried in the bilayer with no exposure outside the bilayer. | 37 |
| GO:0001405 | presequence translocase-associated import motor | Protein complex located on the matrix side of the mitochondrial inner membrane and associated with the presequence translocase complex; hydrolyzes ATP to provide the force to drive import of proteins into the mitochondrial matrix. | 33 |
| GO:0005744 | mitochondrial inner membrane presequence translocase complex | The protein transport machinery of the mitochondrial inner membrane that contains three essential Tim proteins: Tim17 and Tim23 are thought to build a preprotein translocation channel while Tim44 interacts transiently with the matrix heat-shock protein Hsp70 to form an ATP-driven import motor. | 30 |
| GO:0005947 | mitochondrial alpha-ketoglutarate dehydrogenase complex | Mitochondrial complex that possesses alpha-ketoglutarate dehydrogenase activity. | 30 |
| GO:0044455 | mitochondrial membrane part | Any constituent part of a mitochondrial membrane, either of the lipid bilayers that surround the mitochondrion and form the mitochondrial envelope. | 30 |
| GO:0031314 | extrinsic to mitochondrial inner membrane | Loosely bound to one surface of the mitochondrial inner membrane, but not integrated into the hydrophobic region. | 28 |
| GO:0005967 | mitochondrial pyruvate dehydrogenase complex | Complex that carries out the oxidative decarboxylation of pyruvate to form acetyl-CoA in eukaryotes; includes subunits possessing three catalytic activities: pyruvate dehydrogenase (E1), dihydrolipoamide S-acetyltransferase (E2), and dihydrolipoamide dehydrogenase (E3). The This Eukaryotic form usually contains more subunits than its bacterial counterpart; for example, one known complex contains 30 E1 dimers, 60 E2 monomers, and 6 E3 dimers as well as a few copies of pyruvate dehydrogenase kinase and pyruvate dehydrogenase phosphatase. | 26 |
| GO:0005750 | mitochondrial respiratory chain complex III | A protein complex located in the mitochondrial inner membrane that forms part of the mitochondrial respiratory chain. Contains about 10 polypeptide subunits including four redox centers: cytochrome b/b6, cytochrome c1 and an 2Fe-2S cluster. Catalyzes the oxidation of ubiquinol by oxidized cytochrome c1. | 25 |
| GO:0016006 | Nebenkern | A product of the fusion of the mitochondria during spermatogenesis. After the completion of meiosis the mitochondria of the spermatid collect along side the nucleus and fuse into two masses; these wrap around each other to produce the spherical Nebenkern. During flagellum elongation the Nebenkern unfolds and the two derivatives (major and minor mitochondrial derivatives) elongate down the axoneme. | 22 |
| GO:0031315 | extrinsic to mitochondrial outer membrane | Loosely bound to one surface of the mitochondrial outer membrane, but not integrated into the hydrophobic region. | 21 |
| GO:0005749 | mitochondrial respiratory chain complex II | A protein complex located in the mitochondrial inner membrane that forms part of the mitochondrial respiratory chain. Contains the four polypeptide subunits of succinate dehydrogenase, flavin-adenine dinucleotide and iron-sulfur. Catalyzes the oxidation of succinate by ubiquinone. Connects the TCA cycle with the respiratory chain. | 18 |
| GO:0005763 | mitochondrial small ribosomal subunit | The smaller of the two subunits of a mitochondrial ribosome. | 17 |
| GO:0036266 | Cdc48p-Npl4p-Vms1p AAA ATPase complex | A multiprotein ATPase complex involved in the release of polyubiquitinated proteins, including those damaged by oxidative stress, from the outer mitochondria membrane into the cytoplasm where they are presented to the proteasome for proteolysis, a process also referred to as mitochondria-associated degradation (MAD). In budding yeast, this complex includes Cdc48p, Npl4p and Vms1p. | 16 |
| GO:0032592 | integral to mitochondrial membrane | Located such that some or all of the gene product itself penetrates at least one phospholipid bilayer of a mitochondrial membrane. May also refer to the state of being buried in the bilayer with no exposure outside the bilayer. | 15 |
| GO:0097002 | mitochondrial inner boundary membrane | The portion of the mitochondrial inner membrane that is not invaginated to form cristae. The inner boundary membrane lies parallel to the outer membrane. | 13 |
| GO:0005745 | m-AAA complex | Protease complex of the mitochondrial inner membrane that is involved in mitochondrial protein turnover and in processing of proteins imported into mitochondria. | 13 |
| GO:0017087 | mitochondrial processing peptidase complex | A protein complex that consists of a catalytic alpha subunit (alpha-MPP) and a regulatory beta subunit (beta-MPP), and catalyzes the release of N-terminal targeting peptides from precursor proteins imported into the mitochondrion. | 11 |
| GO:0031304 | intrinsic to mitochondrial inner membrane | Located in the mitochondrial inner membrane such that some covalently attached portion of the gene product, for example part of a peptide sequence or some other covalently attached group such as a GPI anchor, spans or is embedded in one or both leaflets of the membrane. | 11 |
| GO:0017133 | mitochondrial electron transfer flavoprotein complex | A protein complex located in the mitochondrion. It contains flavin adenine dinucleotide (FAD) that, together with an acyl-CoA dehydrogenase, forms a system that oxidizes an acyl-CoA molecule and reduces ubiquinone and other acceptors in the mitochondrial electron transport system. | 10 |
| GO:0009353 | mitochondrial oxoglutarate dehydrogenase complex | A complex of multiple copies of three enzymatic components: oxoglutarate dehydrogenase (lipoamide) ; EC:1.2.4.2 (E1), dihydrolipoamide S-succinyltransferase ; EC:2.3.1.61 (E2) and dihydrolipoamide dehydrogenase ; EC:1.8.1.4 (E3); catalyzes the overall conversion of 2-oxoglutarate to succinyl-CoA and carbon dioxide (CO2) within the mitochondrial matrix. An example of this complex is found in Mus musculus. | 10 |
| GO:0005742 | mitochondrial outer membrane translocase complex | A large complex of the mitochondrial outer membrane that mediates transport of proteins into all mitochondrial compartments. | 10 |
| GO:0016507 | mitochondrial fatty acid beta-oxidation multienzyme complex | A complex that includes the long-chain 3-hydroxyacyl-CoA dehydrogenase and long-chain enoyl-CoA hydratase activities in two subunits (alpha and beta), catalyzing two steps of the fatty acid beta-oxidation cycle within the mitochondrial matrix. | 8 |
| GO:0017086 | 3-methyl-2-oxobutanoate dehydrogenase (lipoamide) complex | A protein complex that catalyzes the reaction 3-methyl-2-oxobutanoate + lipoamide = S-(2-methylpropanoyl)-dihydrolipoamide + carbon dioxide (CO2). This requires thiamine diphosphate; the enzyme also acts on (S)-3-methyl-2-oxopentanoate and 4-methyl-2-oxo-pentanoate. | 7 |
| GO:0000276 | mitochondrial proton-transporting ATP synthase complex, coupling factor F(o) | All non-F1 subunits of the mitochondrial hydrogen-transporting ATP synthase, including integral and peripheral mitochondrial inner membrane proteins. | 7 |
| GO:0005761 | mitochondrial ribosome | A ribosome found in the mitochondrion of a eukaryotic cell; contains a characteristic set of proteins distinct from those of cytosolic ribosomes. | 7 |
| GO:0042720 | mitochondrial inner membrane peptidase complex | Protease complex of the mitochondrial inner membrane, consisting of at least two subunits, involved in processing of both nuclear- and mitochondrially-encoded proteins targeted to the intermembrane space. | 7 |
| GO:0031942 | i-AAA complex | Protease complex of the mitochondrial inner membrane whose catalytic residues lie on the intermembrane space side of the inner membrane; involved in mitochondrial protein turnover. Contains a subunit belonging to the AAA family of ATP-dependent metalloproteases. | 7 |
| GO:0045244 | succinate-CoA ligase complex (GDP-forming) | A heterodimeric enzyme complex, usually composed of an alpha and beta chain. Functions in the TCA cycle, hydrolyzing succinyl-CoA into succinate and CoA, thereby forming GTP. | 6 |
| GO:0009841 | mitochondrial endopeptidase Clp complex | A Clp endopeptidase complex located in the mitochondrion. | 6 |
| GO:0035632 | mitochondrial prohibitin complex | A complex composed of two proteins, prohibitin 1 and prohibitin 2 (PHB1/PHB-1 and PHB2/PHB-2) that is highly conserved amongst eukaryotes and associated with the inner mitochondrial membrane. The mitochondrial prohibitin complex is a macromolecular supercomplex composed of repeating heterodimeric subunits of PHB1 and PHB2. The mitochondrial prohibitin complex plays a role in a number of biological processes, including mitochondrial biogenesis and function, development, replicative senescence, and cell death. | 5 |
| GO:0005754 | mitochondrial proton-transporting ATP synthase, catalytic core | The hexamer, comprising three alpha and three beta subunits, that possesses the catalytic activity of the mitochondrial hydrogen-transporting ATP synthase. | 5 |
| GO:0005746 | mitochondrial respiratory chain | 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. | 5 |
| GO:0045025 | mitochondrial degradosome | A mitochondrial protein complex with 3' to 5' exoribonuclease activity that participates in intron-independent turnover and processing of mitochondrial transcripts. In humans, the mitochondrial degradosome is a pentameric complex, and in yeast it exists as a heterodimer. | 4 |
| GO:0000275 | mitochondrial proton-transporting ATP synthase complex, catalytic core F(1) | The catalytic sector of the mitochondrial hydrogen-transporting ATP synthase; it comprises the catalytic core and central stalk, and is peripherally associated with the mitochondrial inner membrane when the entire ATP synthase is assembled. | 4 |
| GO:0005962 | mitochondrial isocitrate dehydrogenase complex (NAD+) | Mitochondrial complex that possesses isocitrate dehydrogenase (NAD+) activity. | 4 |
| GO:0042652 | mitochondrial respiratory chain complex I, peripheral segment | 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. | 4 |
| GO:0005762 | mitochondrial large ribosomal subunit | The larger of the two subunits of a mitochondrial ribosome. Two sites on the ribosomal large subunit are involved in translation: the aminoacyl site (A site) and peptidyl site (P site). | 4 |
| GO:0042721 | mitochondrial inner membrane protein insertion complex | A multi-subunit complex embedded in the mitochondrial inner membrane that mediates insertion of carrier proteins into the inner membrane. | 3 |
| GO:0005751 | mitochondrial respiratory chain complex IV | A protein complex located in the mitochondrial inner membrane that forms part of the mitochondrial respiratory chain. Contains the 13 polypeptide subunits of cytochrome c oxidase, including cytochrome a and cytochrome a3. Catalyzes the oxidation of reduced cytochrome c by dioxygen (O2). | 3 |
| GO:0042719 | mitochondrial intermembrane space protein transporter complex | Soluble complex of the mitochondrial intermembrane space composed of various combinations of small Tim proteins; acts as a protein transporter to guide proteins to the Tim22 complex for insertion into the mitochondrial inner membrane. | 3 |
| GO:0032865 | ERMES complex | A protein complex that links the endoplasmic reticulum with mitochondria and may have a role in promoting exchange of calcium and phospholipids between the two organelles. The complex is also associated with actively replicating mitochondrial DNA nucleoids, and may further coordinate mitochondrial genome replication and membrane growth. | 2 |
| GO:0000262 | mitochondrial chromosome | A chromosome found in the mitochondrion of a eukaryotic cell. | 1 |
| GO:0002169 | 3-methylcrotonyl-CoA carboxylase complex, mitochondrial | A heterodimeric complex having 3-methylcrotonyl-CoA carboxylase activity. The alpha subunit has a covalently bound biotin essential for the ATP-dependent carboxylation. The beta subunit possess carboxyltransferase activity which presumably is essential for binding to 3-methylcrotonyl-CoA. | 1 |