The name of this superfamily has been modified since the most recent official CATH+ release (v4_3_0). At the point of the last release, this superfamily was named:

"
Immunoglobulins
".

Functional Families

Overview of the Structural Clusters (SC) and Functional Families within this CATH Superfamily. Clusters with a representative structure are represented by a filled circle.
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FunFam 280: HLA class II histocompatibility antigen, DR alpha ...

Please note: GO annotations are assigned to the full protein sequence rather than individual protein domains. Since a given protein can contain multiple domains, it is possible that some of the annotations below come from additional domains that occur in the same protein, but have been classified elsewhere in CATH.

There are 10 GO terms relating to "molecular function"

The search results have been sorted with the annotations that are found most frequently at the top of the list. The results can be filtered by typing text into the search box at the top of the table.
GO Term Annotations Evidence
Protein binding GO:0005515
Interacting selectively and non-covalently with any protein or protein complex (a complex of two or more proteins that may include other nonprotein molecules).
47 P01903 (/IPI) P01903 (/IPI) P01909 (/IPI) P01909 (/IPI) P01909 (/IPI) P01910 (/IPI) P04227 (/IPI) P04228 (/IPI) P06340 (/IPI) P06340 (/IPI)
(37 more)
MHC class II receptor activity GO:0032395
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.
34 P01909 (/TAS) P01909 (/TAS) P01909 (/TAS) P06340 (/TAS) P06340 (/TAS) P06340 (/TAS) P06340 (/TAS) P06340 (/TAS) P06340 (/TAS) P06340 (/TAS)
(24 more)
MHC class II protein complex binding GO:0023026
Interacting selectively and non-covalently with the class II major histocompatibility complex.
31 P06340 (/IDA) P06340 (/IDA) P06340 (/IDA) P06340 (/IDA) P06340 (/IDA) P06340 (/IDA) P06340 (/IDA) P06340 (/IDA) P06340 (/IDA) P06340 (/IDA)
(21 more)
Peptide antigen binding GO:0042605
Interacting selectively and non-covalently with an antigen peptide.
15 P01903 (/IDA) P01903 (/IDA) P01910 (/IDA) P04227 (/IDA) P04228 (/IDA) P14434 (/IDA) P14434 (/IDA) P14435 (/IDA) P14436 (/IDA) P14437 (/IDA)
(5 more)
Protein heterodimerization activity GO:0046982
Interacting selectively and non-covalently with a nonidentical protein to form a heterodimer.
11 P01910 (/ISO) P04227 (/ISO) P04228 (/ISO) P14434 (/ISO) P14434 (/ISO) P14435 (/ISO) P14436 (/ISO) P14437 (/ISO) P14437 (/ISO) P14438 (/ISO)
(1 more)
MHC class II receptor activity GO:0032395
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.
9 P01903 (/NAS) P01903 (/NAS) P01906 (/NAS) P01906 (/NAS) P01909 (/NAS) P01909 (/NAS) P01909 (/NAS) P20036 (/NAS) P20036 (/NAS)
MHC class II protein complex binding GO:0023026
Interacting selectively and non-covalently with the class II major histocompatibility complex.
3 B2RST7 (/ISO) Q31150 (/ISO) Q9QWV1 (/ISO)
Peptide antigen binding GO:0042605
Interacting selectively and non-covalently with an antigen peptide.
3 P01909 (/ISS) P01909 (/ISS) P01909 (/ISS)
MHC class II protein complex binding GO:0023026
Interacting selectively and non-covalently with the class II major histocompatibility complex.
2 P01903 (/HDA) P01903 (/HDA)
Protein heterodimerization activity GO:0046982
Interacting selectively and non-covalently with a nonidentical protein to form a heterodimer.
1 P20037 (/IDA)

There are 25 GO terms relating to "biological process"

The search results have been sorted with the annotations that are found most frequently at the top of the list. The results can be filtered by typing text into the search box at the top of the table.
GO Term Annotations Evidence
Antigen processing and presentation of exogenous peptide antigen via MHC class II GO:0019886
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.
40 P01903 (/TAS) P01903 (/TAS) P01906 (/TAS) P01906 (/TAS) P01909 (/TAS) P01909 (/TAS) P01909 (/TAS) P06340 (/TAS) P06340 (/TAS) P06340 (/TAS)
(30 more)
Negative regulation of antigen processing and presentation of peptide antigen via MHC class II GO:0002587
Any process that stops, prevents, or reduces the frequency, rate, or extent of antigen processing and presentation of peptide antigen via MHC class II.
31 P06340 (/IDA) P06340 (/IDA) P06340 (/IDA) P06340 (/IDA) P06340 (/IDA) P06340 (/IDA) P06340 (/IDA) P06340 (/IDA) P06340 (/IDA) P06340 (/IDA)
(21 more)
Antigen processing and presentation GO:0019882
The process in which an antigen-presenting cell expresses antigen (peptide or lipid) on its cell surface in association with an MHC protein complex.
11 P01910 (/IDA) P04227 (/IDA) P04228 (/IDA) P14434 (/IDA) P14434 (/IDA) P14435 (/IDA) P14436 (/IDA) P14437 (/IDA) P14437 (/IDA) P14438 (/IDA)
(1 more)
Antigen processing and presentation of exogenous peptide antigen via MHC class II GO:0019886
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.
11 P01910 (/IDA) P04227 (/IDA) P04228 (/IDA) P14434 (/IDA) P14434 (/IDA) P14435 (/IDA) P14436 (/IDA) P14437 (/IDA) P14437 (/IDA) P14438 (/IDA)
(1 more)
Negative regulation of T cell proliferation GO:0042130
Any process that stops, prevents or reduces the rate or extent of T cell proliferation.
11 P01910 (/ISO) P04227 (/ISO) P04228 (/ISO) P14434 (/ISO) P14434 (/ISO) P14435 (/ISO) P14436 (/ISO) P14437 (/ISO) P14437 (/ISO) P14438 (/ISO)
(1 more)
Positive regulation of T cell differentiation GO:0045582
Any process that activates or increases the frequency, rate or extent of T cell differentiation.
11 P01910 (/IDA) P04227 (/IDA) P04228 (/IDA) P14434 (/IDA) P14434 (/IDA) P14435 (/IDA) P14436 (/IDA) P14437 (/IDA) P14437 (/IDA) P14438 (/IDA)
(1 more)
Antigen processing and presentation of peptide antigen GO:0048002
The process in which an antigen-presenting cell expresses peptide antigen in association with an MHC protein complex on its cell surface, including proteolysis and transport steps for the peptide antigen both prior to and following assembly with the MHC protein complex. The peptide antigen is typically, but not always, processed from an endogenous or exogenous protein.
11 P01910 (/IDA) P04227 (/IDA) P04228 (/IDA) P14434 (/IDA) P14434 (/IDA) P14435 (/IDA) P14436 (/IDA) P14437 (/IDA) P14437 (/IDA) P14438 (/IDA)
(1 more)
Immune response GO:0006955
Any immune system process that functions in the calibrated response of an organism to a potential internal or invasive threat.
9 P01903 (/NAS) P01903 (/NAS) P01906 (/NAS) P01906 (/NAS) P01909 (/NAS) P01909 (/NAS) P01909 (/NAS) P20036 (/NAS) P20036 (/NAS)
T cell receptor signaling pathway GO:0050852
A series of molecular signals initiated by the cross-linking of an antigen receptor on a T cell.
9 P01903 (/TAS) P01903 (/TAS) P01906 (/TAS) P01906 (/TAS) P01909 (/TAS) P01909 (/TAS) P01909 (/TAS) P20036 (/TAS) P20036 (/TAS)
Interferon-gamma-mediated signaling pathway GO:0060333
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.
9 P01903 (/TAS) P01903 (/TAS) P01906 (/TAS) P01906 (/TAS) P01909 (/TAS) P01909 (/TAS) P01909 (/TAS) P20036 (/TAS) P20036 (/TAS)
Antigen processing and presentation of exogenous peptide antigen via MHC class II GO:0019886
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.
5 B2RST7 (/IMP) P20036 (/IMP) P20036 (/IMP) Q31150 (/IMP) Q9QWV1 (/IMP)
Negative regulation of antigen processing and presentation of peptide antigen via MHC class II GO:0002587
Any process that stops, prevents, or reduces the frequency, rate, or extent of antigen processing and presentation of peptide antigen via MHC class II.
3 B2RST7 (/ISO) Q31150 (/ISO) Q9QWV1 (/ISO)
Antigen processing and presentation GO:0019882
The process in which an antigen-presenting cell expresses antigen (peptide or lipid) on its cell surface in association with an MHC protein complex.
3 B2RST7 (/IMP) Q31150 (/IMP) Q9QWV1 (/IMP)
Regulation of T cell differentiation GO:0045580
Any process that modulates the frequency, rate or extent of T cell differentiation.
3 B2RST7 (/IMP) Q31150 (/IMP) Q9QWV1 (/IMP)
Peptide antigen assembly with MHC class II protein complex GO:0002503
The binding of a peptide to the antigen binding groove of an MHC class II protein complex.
2 P01903 (/IDA) P01903 (/IDA)
Antigen processing and presentation of peptide or polysaccharide antigen via MHC class II GO:0002504
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.
2 P01903 (/IDA) P01903 (/IDA)
Polysaccharide assembly with MHC class II protein complex GO:0002506
The binding of a polysaccharide to the antigen binding groove of an MHC class II protein complex.
2 P01903 (/IDA) P01903 (/IDA)
Positive regulation of interferon-gamma production GO:0032729
Any process that activates or increases the frequency, rate, or extent of interferon-gamma production. Interferon-gamma is also known as type II interferon.
2 P20036 (/IMP) P20036 (/IMP)
Response to interferon-gamma GO:0034341
Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of an interferon-gamma stimulus. Interferon-gamma is also known as type II interferon.
2 P14434 (/IDA) P14434 (/IDA)
Positive regulation of T cell proliferation GO:0042102
Any process that activates or increases the rate or extent of T cell proliferation.
2 P20036 (/IMP) P20036 (/IMP)
Positive regulation of T cell activation GO:0050870
Any process that activates or increases the frequency, rate or extent of T cell activation.
2 P20036 (/IMP) P20036 (/IMP)
Cognition GO:0050890
The operation of the mind by which an organism becomes aware of objects of thought or perception; it includes the mental activities associated with thinking, learning, and memory.
2 P01903 (/IMP) P01903 (/IMP)
Cellular response to interferon-gamma GO:0071346
Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of an interferon-gamma stimulus. Interferon gamma is the only member of the type II interferon found so far.
2 P20036 (/IDA) P20036 (/IDA)
Negative regulation of T cell proliferation GO:0042130
Any process that stops, prevents or reduces the rate or extent of T cell proliferation.
1 P20037 (/IDA)
Cellular response to glucocorticoid stimulus GO:0071385
Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a glucocorticoid stimulus. Glucocorticoids are hormonal C21 corticosteroids synthesized from cholesterol with the ability to bind with the cortisol receptor and trigger similar effects. Glucocorticoids act primarily on carbohydrate and protein metabolism, and have anti-inflammatory effects.
1 P20037 (/IEP)

There are 24 GO terms relating to "cellular component"

The search results have been sorted with the annotations that are found most frequently at the top of the list. The results can be filtered by typing text into the search box at the top of the table.
GO Term Annotations Evidence
MHC class II protein complex GO:0042613
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.
46 P01903 (/IDA) P01903 (/IDA) P01910 (/IDA) P04227 (/IDA) P04228 (/IDA) P06340 (/IDA) P06340 (/IDA) P06340 (/IDA) P06340 (/IDA) P06340 (/IDA)
(36 more)
Lysosomal membrane GO:0005765
The lipid bilayer surrounding the lysosome and separating its contents from the cell cytoplasm.
40 P01903 (/TAS) P01903 (/TAS) P01906 (/TAS) P01906 (/TAS) P01909 (/TAS) P01909 (/TAS) P01909 (/TAS) P06340 (/TAS) P06340 (/TAS) P06340 (/TAS)
(30 more)
Plasma membrane GO:0005886
The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.
40 P01903 (/TAS) P01903 (/TAS) P01906 (/TAS) P01906 (/TAS) P01909 (/TAS) P01909 (/TAS) P01909 (/TAS) P06340 (/TAS) P06340 (/TAS) P06340 (/TAS)
(30 more)
Lysosome GO:0005764
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.
13 P01903 (/IDA) P01903 (/IDA) P01910 (/IDA) P04227 (/IDA) P04228 (/IDA) P14434 (/IDA) P14434 (/IDA) P14435 (/IDA) P14436 (/IDA) P14437 (/IDA)
(3 more)
Plasma membrane GO:0005886
The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.
13 P01903 (/IDA) P01903 (/IDA) P01910 (/IDA) P04227 (/IDA) P04228 (/IDA) P14434 (/IDA) P14434 (/IDA) P14435 (/IDA) P14436 (/IDA) P14437 (/IDA)
(3 more)
Intracellular membrane-bounded organelle GO:0043231
Organized structure of distinctive morphology and function, bounded by a single or double lipid bilayer membrane and occurring within the cell. Includes the nucleus, mitochondria, plastids, vacuoles, and vesicles. Excludes the plasma membrane.
12 J3KQ99 (/IDA) J3KQ99 (/IDA) J3KQ99 (/IDA) J3KQ99 (/IDA) J3KQ99 (/IDA) J3KQ99 (/IDA) J3KQ99 (/IDA) J3KQ99 (/IDA) P20036 (/IDA) P20036 (/IDA)
(2 more)
External side of plasma membrane GO:0009897
The leaflet of the plasma membrane that faces away from the cytoplasm and any proteins embedded or anchored in it or attached to its surface.
11 P01910 (/IDA) P04227 (/IDA) P04228 (/IDA) P14434 (/IDA) P14434 (/IDA) P14435 (/IDA) P14436 (/IDA) P14437 (/IDA) P14437 (/IDA) P14438 (/IDA)
(1 more)
Golgi membrane GO:0000139
The lipid bilayer surrounding any of the compartments of the Golgi apparatus.
9 P01903 (/TAS) P01903 (/TAS) P01906 (/TAS) P01906 (/TAS) P01909 (/TAS) P01909 (/TAS) P01909 (/TAS) P20036 (/TAS) P20036 (/TAS)
Integral component of plasma membrane GO:0005887
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.
9 P01903 (/NAS) P01903 (/NAS) P01906 (/NAS) P01906 (/NAS) P01909 (/NAS) P01909 (/NAS) P01909 (/NAS) P20036 (/NAS) P20036 (/NAS)
ER to Golgi transport vesicle membrane GO:0012507
The lipid bilayer surrounding a vesicle transporting substances from the endoplasmic reticulum to the Golgi.
9 P01903 (/TAS) P01903 (/TAS) P01906 (/TAS) P01906 (/TAS) P01909 (/TAS) P01909 (/TAS) P01909 (/TAS) P20036 (/TAS) P20036 (/TAS)
Transport vesicle membrane GO:0030658
The lipid bilayer surrounding a transport vesicle.
9 P01903 (/TAS) P01903 (/TAS) P01906 (/TAS) P01906 (/TAS) P01909 (/TAS) P01909 (/TAS) P01909 (/TAS) P20036 (/TAS) P20036 (/TAS)
Endocytic vesicle membrane GO:0030666
The lipid bilayer surrounding an endocytic vesicle.
9 P01903 (/TAS) P01903 (/TAS) P01906 (/TAS) P01906 (/TAS) P01909 (/TAS) P01909 (/TAS) P01909 (/TAS) P20036 (/TAS) P20036 (/TAS)
Clathrin-coated endocytic vesicle membrane GO:0030669
The lipid bilayer surrounding a clathrin-coated endocytic vesicle.
9 P01903 (/TAS) P01903 (/TAS) P01906 (/TAS) P01906 (/TAS) P01909 (/TAS) P01909 (/TAS) P01909 (/TAS) P20036 (/TAS) P20036 (/TAS)
Trans-Golgi network membrane GO:0032588
The lipid bilayer surrounding any of the compartments that make up the trans-Golgi network.
9 P01903 (/TAS) P01903 (/TAS) P01906 (/TAS) P01906 (/TAS) P01909 (/TAS) P01909 (/TAS) P01909 (/TAS) P20036 (/TAS) P20036 (/TAS)
Integral component of lumenal side of endoplasmic reticulum membrane GO:0071556
The component of the endoplasmic reticulum membrane consisting of the gene products that penetrate only the lumenal side of the membrane.
9 P01903 (/TAS) P01903 (/TAS) P01906 (/TAS) P01906 (/TAS) P01909 (/TAS) P01909 (/TAS) P01909 (/TAS) P20036 (/TAS) P20036 (/TAS)
Membrane GO:0016020
A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
3 P01909 (/HDA) P01909 (/HDA) P01909 (/HDA)
MHC class II protein complex GO:0042613
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.
3 B2RST7 (/ISO) Q31150 (/ISO) Q9QWV1 (/ISO)
MHC class II protein complex GO:0042613
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.
3 P01909 (/ISS) P01909 (/ISS) P01909 (/ISS)
Lysosomal membrane GO:0005765
The lipid bilayer surrounding the lysosome and separating its contents from the cell cytoplasm.
2 P01903 (/IDA) P01903 (/IDA)
Cell surface GO:0009986
The external part of the cell wall and/or plasma membrane.
2 P01903 (/IDA) P01903 (/IDA)
Cell surface GO:0009986
The external part of the cell wall and/or plasma membrane.
2 P20036 (/IMP) P20036 (/IMP)
Late endosome membrane GO:0031902
The lipid bilayer surrounding a late endosome.
2 P01903 (/IDA) P01903 (/IDA)
MHC class II protein complex GO:0042613
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.
2 P01903 (/IMP) P01903 (/IMP)
Extracellular exosome GO:0070062
A vesicle that is released into the extracellular region by fusion of the limiting endosomal membrane of a multivesicular body with the plasma membrane. Extracellular exosomes, also simply called exosomes, have a diameter of about 40-100 nm.
2 P01903 (/HDA) P01903 (/HDA)