Asymmetric/Biological Unit(hide GO term definitions)
Chain A ( DQA1_HUMAN | P01909)
molecular function |
| GO:0032395 | | MHC class II receptor activity | | Combining with an MHC class II protein complex and transmitting the signal from one side of the membrane to the other to initiate a change in cell activity. |
| GO:0042605 | | peptide antigen binding | | Interacting selectively and non-covalently with an antigen peptide. |
biological process |
| GO:0031295 | | T cell costimulation | | The process of providing, via surface-bound receptor-ligand pairs, a second, antigen-independent, signal in addition to that provided by the T cell receptor to augment T cell activation. |
| GO:0050852 | | T cell receptor signaling pathway | | A series of molecular signals initiated by the cross-linking of an antigen receptor on a T cell. |
| GO:0019882 | | antigen processing and presentation | | The process in which an antigen-presenting cell expresses antigen (peptide or lipid) on its cell surface in association with an MHC protein complex. |
| GO:0019886 | | antigen processing and presentation of exogenous peptide antigen via MHC class II | | The process in which an antigen-presenting cell expresses a peptide antigen of exogenous origin on its cell surface in association with an MHC class II protein complex. The peptide antigen is typically, but not always, processed from a whole protein. |
| GO:0002504 | | antigen processing and presentation of peptide or polysaccharide antigen via MHC class II | | The process in which an antigen-presenting cell expresses antigen (peptide or polysaccharide) on its cell surface in association with an MHC class II protein complex. |
| GO:0006955 | | immune response | | Any immune system process that functions in the calibrated response of an organism to a potential internal or invasive threat. |
| GO:0002376 | | immune system process | | Any process involved in the development or functioning of the immune system, an organismal system for calibrated responses to potential internal or invasive threats. |
| GO:0060333 | | interferon-gamma-mediated signaling pathway | | A series of molecular signals initiated by the binding of interferon-gamma to a receptor on the surface of a cell, and ending with regulation of a downstream cellular process, e.g. transcription. Interferon gamma is the only member of the type II interferon found so far. |
cellular component |
| GO:0012507 | | ER to Golgi transport vesicle membrane | | The lipid bilayer surrounding a vesicle transporting substances from the endoplasmic reticulum to the Golgi. |
| GO:0005794 | | Golgi apparatus | | A compound membranous cytoplasmic organelle of eukaryotic cells, consisting of flattened, ribosome-free vesicles arranged in a more or less regular stack. The Golgi apparatus differs from the endoplasmic reticulum in often having slightly thicker membranes, appearing in sections as a characteristic shallow semicircle so that the convex side (cis or entry face) abuts the endoplasmic reticulum, secretory vesicles emerging from the concave side (trans or exit face). In vertebrate cells there is usually one such organelle, while in invertebrates and plants, where they are known usually as dictyosomes, there may be several scattered in the cytoplasm. The Golgi apparatus processes proteins produced on the ribosomes of the rough endoplasmic reticulum; such processing includes modification of the core oligosaccharides of glycoproteins, and the sorting and packaging of proteins for transport to a variety of cellular locations. Three different regions of the Golgi are now recognized both in terms of structure and function: cis, in the vicinity of the cis face, trans, in the vicinity of the trans face, and medial, lying between the cis and trans regions. |
| GO:0000139 | | Golgi membrane | | The lipid bilayer surrounding any of the compartments of the Golgi apparatus. |
| GO:0042613 | | MHC class II protein complex | | A transmembrane protein complex composed of an MHC class II alpha and MHC class II beta chain, and with or without a bound peptide or polysaccharide antigen. |
| GO:0030669 | | clathrin-coated endocytic vesicle membrane | | The lipid bilayer surrounding a clathrin-coated endocytic vesicle. |
| GO:0030666 | | endocytic vesicle membrane | | The lipid bilayer surrounding an endocytic vesicle. |
| GO:0005783 | | endoplasmic reticulum | | The irregular network of unit membranes, visible only by electron microscopy, that occurs in the cytoplasm of many eukaryotic cells. The membranes form a complex meshwork of tubular channels, which are often expanded into slitlike cavities called cisternae. The ER takes two forms, rough (or granular), with ribosomes adhering to the outer surface, and smooth (with no ribosomes attached). |
| GO:0005789 | | endoplasmic reticulum membrane | | The lipid bilayer surrounding the endoplasmic reticulum. |
| GO:0005768 | | endosome | | A vacuole to which materials ingested by endocytosis are delivered. |
| GO:0010008 | | endosome membrane | | The lipid bilayer surrounding an endosome. |
| GO:0071556 | | integral component of lumenal side of endoplasmic reticulum membrane | | The component of the endoplasmic reticulum membrane consisting of the gene products that penetrate only the lumenal side of the membrane. |
| GO:0016021 | | integral component of membrane | | The component of a membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane. |
| GO:0005887 | | integral component of plasma membrane | | The component of the plasma membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane. |
| GO:0005765 | | lysosomal membrane | | The lipid bilayer surrounding the lysosome and separating its contents from the cell cytoplasm. |
| GO:0005764 | | lysosome | | A small lytic vacuole that has cell cycle-independent morphology and is found in most animal cells and that contains a variety of hydrolases, most of which have their maximal activities in the pH range 5-6. The contained enzymes display latency if properly isolated. About 40 different lysosomal hydrolases are known and lysosomes have a great variety of morphologies and functions. |
| GO:0016020 | | membrane | | A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it. |
| GO:0005886 | | plasma membrane | | The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins. |
| GO:0032588 | | trans-Golgi network membrane | | The lipid bilayer surrounding any of the compartments that make up the trans-Golgi network. |
| GO:0030658 | | transport vesicle membrane | | The lipid bilayer surrounding a transport vesicle. |
Chain B ( DQB1_HUMAN | P01920)
molecular function |
| GO:0032395 | | MHC class II receptor activity | | Combining with an MHC class II protein complex and transmitting the signal from one side of the membrane to the other to initiate a change in cell activity. |
| GO:0042605 | | peptide antigen binding | | Interacting selectively and non-covalently with an antigen peptide. |
biological process |
| GO:0031295 | | T cell costimulation | | The process of providing, via surface-bound receptor-ligand pairs, a second, antigen-independent, signal in addition to that provided by the T cell receptor to augment T cell activation. |
| GO:0050852 | | T cell receptor signaling pathway | | A series of molecular signals initiated by the cross-linking of an antigen receptor on a T cell. |
| GO:0019882 | | antigen processing and presentation | | The process in which an antigen-presenting cell expresses antigen (peptide or lipid) on its cell surface in association with an MHC protein complex. |
| GO:0019886 | | antigen processing and presentation of exogenous peptide antigen via MHC class II | | The process in which an antigen-presenting cell expresses a peptide antigen of exogenous origin on its cell surface in association with an MHC class II protein complex. The peptide antigen is typically, but not always, processed from a whole protein. |
| GO:0002504 | | antigen processing and presentation of peptide or polysaccharide antigen via MHC class II | | The process in which an antigen-presenting cell expresses antigen (peptide or polysaccharide) on its cell surface in association with an MHC class II protein complex. |
| GO:0002455 | | humoral immune response mediated by circulating immunoglobulin | | An immune response dependent upon secreted immunoglobulin. An example of this process is found in Mus musculus. |
| GO:0006955 | | immune response | | Any immune system process that functions in the calibrated response of an organism to a potential internal or invasive threat. |
| GO:0002376 | | immune system process | | Any process involved in the development or functioning of the immune system, an organismal system for calibrated responses to potential internal or invasive threats. |
| GO:0002381 | | immunoglobulin production involved in immunoglobulin mediated immune response | | The appearance of immunoglobulin due to biosynthesis or secretion following a cellular stimulus during an immune response, resulting in an increase in its intracellular or extracellular levels. |
| GO:0060333 | | interferon-gamma-mediated signaling pathway | | A series of molecular signals initiated by the binding of interferon-gamma to a receptor on the surface of a cell, and ending with regulation of a downstream cellular process, e.g. transcription. Interferon gamma is the only member of the type II interferon found so far. |
cellular component |
| GO:0012507 | | ER to Golgi transport vesicle membrane | | The lipid bilayer surrounding a vesicle transporting substances from the endoplasmic reticulum to the Golgi. |
| GO:0005794 | | Golgi apparatus | | A compound membranous cytoplasmic organelle of eukaryotic cells, consisting of flattened, ribosome-free vesicles arranged in a more or less regular stack. The Golgi apparatus differs from the endoplasmic reticulum in often having slightly thicker membranes, appearing in sections as a characteristic shallow semicircle so that the convex side (cis or entry face) abuts the endoplasmic reticulum, secretory vesicles emerging from the concave side (trans or exit face). In vertebrate cells there is usually one such organelle, while in invertebrates and plants, where they are known usually as dictyosomes, there may be several scattered in the cytoplasm. The Golgi apparatus processes proteins produced on the ribosomes of the rough endoplasmic reticulum; such processing includes modification of the core oligosaccharides of glycoproteins, and the sorting and packaging of proteins for transport to a variety of cellular locations. Three different regions of the Golgi are now recognized both in terms of structure and function: cis, in the vicinity of the cis face, trans, in the vicinity of the trans face, and medial, lying between the cis and trans regions. |
| GO:0000139 | | Golgi membrane | | The lipid bilayer surrounding any of the compartments of the Golgi apparatus. |
| GO:0042613 | | MHC class II protein complex | | A transmembrane protein complex composed of an MHC class II alpha and MHC class II beta chain, and with or without a bound peptide or polysaccharide antigen. |
| GO:0030669 | | clathrin-coated endocytic vesicle membrane | | The lipid bilayer surrounding a clathrin-coated endocytic vesicle. |
| GO:0030666 | | endocytic vesicle membrane | | The lipid bilayer surrounding an endocytic vesicle. |
| GO:0005783 | | endoplasmic reticulum | | The irregular network of unit membranes, visible only by electron microscopy, that occurs in the cytoplasm of many eukaryotic cells. The membranes form a complex meshwork of tubular channels, which are often expanded into slitlike cavities called cisternae. The ER takes two forms, rough (or granular), with ribosomes adhering to the outer surface, and smooth (with no ribosomes attached). |
| GO:0005789 | | endoplasmic reticulum membrane | | The lipid bilayer surrounding the endoplasmic reticulum. |
| GO:0005768 | | endosome | | A vacuole to which materials ingested by endocytosis are delivered. |
| GO:0010008 | | endosome membrane | | The lipid bilayer surrounding an endosome. |
| GO:0071556 | | integral component of lumenal side of endoplasmic reticulum membrane | | The component of the endoplasmic reticulum membrane consisting of the gene products that penetrate only the lumenal side of the membrane. |
| GO:0016021 | | integral component of membrane | | The component of a membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane. |
| GO:0005765 | | lysosomal membrane | | The lipid bilayer surrounding the lysosome and separating its contents from the cell cytoplasm. |
| GO:0005764 | | lysosome | | A small lytic vacuole that has cell cycle-independent morphology and is found in most animal cells and that contains a variety of hydrolases, most of which have their maximal activities in the pH range 5-6. The contained enzymes display latency if properly isolated. About 40 different lysosomal hydrolases are known and lysosomes have a great variety of morphologies and functions. |
| GO:0016020 | | membrane | | A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it. |
| GO:0005886 | | plasma membrane | | The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins. |
| GO:0032588 | | trans-Golgi network membrane | | The lipid bilayer surrounding any of the compartments that make up the trans-Golgi network. |
| GO:0030658 | | transport vesicle membrane | | The lipid bilayer surrounding a transport vesicle. |
Chain C ( OREX_HUMAN | O43612)
molecular function |
| GO:0005184 | | neuropeptide hormone activity | | The action characteristic of a neuropeptide hormone, any peptide hormone that acts in the central nervous system. A neuropeptide is any of several types of molecules found in brain tissue, composed of short chains of amino acids; they include endorphins, enkephalins, vasopressin, and others. They are often localized in axon terminals at synapses and are classified as putative neurotransmitters, although some are also hormones. |
| GO:0031771 | | type 1 hypocretin receptor binding | | Interacting selectively and non-covalently with a type 1 hypocretin receptor. |
| GO:0031772 | | type 2 hypocretin receptor binding | | Interacting selectively and non-covalently with a type 2 hypocretin receptor. |
biological process |
| GO:0007268 | | chemical synaptic transmission | | The vesicular release of classical neurotransmitter molecules from a presynapse, across a chemical synapse, the subsequent activation of neurotransmitter receptors at the postsynapse of a target cell (neuron, muscle, or secretory cell) and the effects of this activation on the postsynaptic membrane potential and ionic composition of the postsynaptic cytosol. This process encompasses both spontaneous and evoked release of neurotransmitter and all parts of synaptic vesicle exocytosis. Evoked transmission starts with the arrival of an action potential at the presynapse. |
| GO:0042755 | | eating behavior | | The specific behavior of an organism relating to the intake of food, any substance (usually solid) that can be metabolized by an organism to give energy and build tissue. |
| GO:0060079 | | excitatory postsynaptic potential | | A process that leads to a temporary increase in postsynaptic potential due to the flow of positively charged ions into the postsynaptic cell. The flow of ions that causes an EPSP is an excitatory postsynaptic current (EPSC) and makes it easier for the neuron to fire an action potential. |
| GO:0007631 | | feeding behavior | | Behavior associated with the intake of food. |
| GO:0008156 | | negative regulation of DNA replication | | Any process that stops, prevents, or reduces the frequency, rate or extent of DNA replication. |
| GO:0043267 | | negative regulation of potassium ion transport | | Any process that stops, prevents, or reduces the frequency, rate or extent of the directed movement of potassium ions (K+) into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore. |
| GO:0051970 | | negative regulation of transmission of nerve impulse | | Any process that stops, prevents, or reduces the frequency, rate or extent of transmission of a nerve impulse, the sequential electrochemical polarization and depolarization that travels across the membrane of a neuron in response to stimulation. |
| GO:0007218 | | neuropeptide signaling pathway | | The series of molecular signals generated as a consequence of a peptide neurotransmitter binding to a cell surface receptor. |
| GO:0007200 | | phospholipase C-activating G-protein coupled receptor signaling pathway | | The series of molecular signals generated as a consequence of a G-protein coupled receptor binding to its physiological ligand, where the pathway proceeds with activation of phospholipase C (PLC) and a subsequent increase in the concentration of inositol trisphosphate (IP3) and diacylglycerol (DAG). |
| GO:0051928 | | positive regulation of calcium ion transport | | Any process that activates or increases the frequency, rate or extent of the directed movement of calcium ions into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore. |
| GO:0007204 | | positive regulation of cytosolic calcium ion concentration | | Any process that increases the concentration of calcium ions in the cytosol. |
| GO:0051971 | | positive regulation of transmission of nerve impulse | | Any process that activates, maintains or increases the frequency, rate or extent of transmission of a nerve impulse, the sequential electrochemical polarization and depolarization that travels across the membrane of a neuron in response to stimulation. |
| GO:0007205 | | protein kinase C-activating G-protein coupled receptor signaling pathway | | The series of molecular signals generated as a consequence of a G-protein coupled receptor binding to its physiological ligand, where the pathway proceeds with activation of protein kinase C (PKC). PKC is activated by second messengers including diacylglycerol (DAG). |
| GO:0046928 | | regulation of neurotransmitter secretion | | Any process that modulates the frequency, rate or extent of the regulated release of a neurotransmitter from a cell. |
cellular component |
| GO:0030054 | | cell junction | | A cellular component that forms a specialized region of connection between two or more cells or between a cell and the extracellular matrix. At a cell junction, anchoring proteins extend through the plasma membrane to link cytoskeletal proteins in one cell to cytoskeletal proteins in neighboring cells or to proteins in the extracellular matrix. |
| GO:0005737 | | cytoplasm | | All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures. |
| GO:0031410 | | cytoplasmic vesicle | | A vesicle found in the cytoplasm of a cell. |
| GO:0005829 | | cytosol | | The part of the cytoplasm that does not contain organelles but which does contain other particulate matter, such as protein complexes. |
| GO:0005783 | | endoplasmic reticulum | | The irregular network of unit membranes, visible only by electron microscopy, that occurs in the cytoplasm of many eukaryotic cells. The membranes form a complex meshwork of tubular channels, which are often expanded into slitlike cavities called cisternae. The ER takes two forms, rough (or granular), with ribosomes adhering to the outer surface, and smooth (with no ribosomes attached). |
| GO:0005576 | | extracellular region | | The space external to the outermost structure of a cell. For cells without external protective or external encapsulating structures this refers to space outside of the plasma membrane. This term covers the host cell environment outside an intracellular parasite. |
| GO:0048471 | | perinuclear region of cytoplasm | | Cytoplasm situated near, or occurring around, the nucleus. |
| GO:0098794 | | postsynapse | | The part of a synapse that is part of the post-synaptic cell. |
| GO:0005791 | | rough endoplasmic reticulum | | The rough (or granular) endoplasmic reticulum (ER) has ribosomes adhering to the outer surface; the ribosomes are the site of translation of the mRNA for those proteins which are either to be retained within the cisternae (ER-resident proteins), the proteins of the lysosomes, or the proteins destined for export from the cell. Glycoproteins undergo their initial glycosylation within the cisternae. |
| GO:0030141 | | secretory granule | | A small subcellular vesicle, surrounded by a membrane, that is formed from the Golgi apparatus and contains a highly concentrated protein destined for secretion. Secretory granules move towards the periphery of the cell and upon stimulation, their membranes fuse with the cell membrane, and their protein load is exteriorized. Processing of the contained protein may take place in secretory granules. |
| GO:0045202 | | synapse | | The junction between a nerve fiber of one neuron and another neuron, muscle fiber or glial cell. As the nerve fiber approaches the synapse it enlarges into a specialized structure, the presynaptic nerve ending, which contains mitochondria and synaptic vesicles. At the tip of the nerve ending is the presynaptic membrane; facing it, and separated from it by a minute cleft (the synaptic cleft) is a specialized area of membrane on the receiving cell, known as the postsynaptic membrane. In response to the arrival of nerve impulses, the presynaptic nerve ending secretes molecules of neurotransmitters into the synaptic cleft. These diffuse across the cleft and transmit the signal to the postsynaptic membrane. |
| GO:0008021 | | synaptic vesicle | | A secretory organelle, typically 50 nm in diameter, of presynaptic nerve terminals; accumulates in high concentrations of neurotransmitters and secretes these into the synaptic cleft by fusion with the 'active zone' of the presynaptic plasma membrane. |
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