The name of this superfamily has been modified since the most recent official CATH+ release (v4_4_0). At the point of the last release, this superfamily was named:

"
Histone, subunit A
".

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 19: Negative cofactor 2 beta

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 18 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).
80 P49592 (/IPI) P49592 (/IPI) P49592 (/IPI) Q01658 (/IPI) Q01658 (/IPI) Q01658 (/IPI) Q01658 (/IPI) Q01658 (/IPI) Q01658 (/IPI) Q01658 (/IPI)
(70 more)
DNA-binding transcription factor activity, RNA polymerase II-specific GO:0000981
A protein or a member of a complex that interacts selectively and non-covalently with a specific DNA sequence (sometimes referred to as a motif) within the regulatory region of a RNA polymerase II-transcribed gene to modulate transcription. Regulatory regions include promoters (proximal and distal) and enhancers. Genes are transcriptional units.
32 Q01658 (/ISM) Q01658 (/ISM) Q01658 (/ISM) Q01658 (/ISM) Q01658 (/ISM) Q01658 (/ISM) Q01658 (/ISM) Q01658 (/ISM) Q01658 (/ISM) Q01658 (/ISM)
(22 more)
DNA binding GO:0003677
Any molecular function by which a gene product interacts selectively and non-covalently with DNA (deoxyribonucleic acid).
32 Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS)
(22 more)
Transcription corepressor activity GO:0003714
A protein or a member of a complex that interacts specifically and non-covalently with a DNA-bound DNA-binding transcription factor to repress the transcription of specific genes. Corepressors often act by altering chromatin structure and modifications. For example, one class of transcription coregulators modifies chromatin structure through covalent modification of histones. A second ATP-dependent class modifies the conformation of chromatin. A third class occludes DNA-binding transcription factor protein-protein interaction domains. A fourth class of corepressors prevents interactions of DNA bound DNA-binding transcription factor with coactivators.
32 Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS)
(22 more)
Transcription factor binding GO:0008134
Interacting selectively and non-covalently with a transcription factor, a protein required to initiate or regulate transcription.
32 Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS)
(22 more)
TBP-class protein binding GO:0017025
Interacting selectively and non-covalently with a member of the class of TATA-binding proteins (TBP), including any of the TBP-related factors (TRFs).
32 Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA)
(22 more)
Core promoter binding GO:0001047
Interacting selectively and non-covalently with the regulatory region composed of the transcription start site and binding sites for the basal transcription machinery. Binding may occur as a sequence specific interaction or as an interaction observed only once a factor has been recruited to the DNA by other factors.
10 Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q9VJQ5 (/IDA) Q9VJQ5 (/IDA) Q9VJQ5 (/IDA)
Transcription corepressor activity GO:0003714
A protein or a member of a complex that interacts specifically and non-covalently with a DNA-bound DNA-binding transcription factor to repress the transcription of specific genes. Corepressors often act by altering chromatin structure and modifications. For example, one class of transcription coregulators modifies chromatin structure through covalent modification of histones. A second ATP-dependent class modifies the conformation of chromatin. A third class occludes DNA-binding transcription factor protein-protein interaction domains. A fourth class of corepressors prevents interactions of DNA bound DNA-binding transcription factor with coactivators.
8 Q5A0I6 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA)
Chromatin binding GO:0003682
Interacting selectively and non-covalently with chromatin, the network of fibers of DNA, protein, and sometimes RNA, that make up the chromosomes of the eukaryotic nucleus during interphase.
7 Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA)
Transcription corepressor activity GO:0003714
A protein or a member of a complex that interacts specifically and non-covalently with a DNA-bound DNA-binding transcription factor to repress the transcription of specific genes. Corepressors often act by altering chromatin structure and modifications. For example, one class of transcription coregulators modifies chromatin structure through covalent modification of histones. A second ATP-dependent class modifies the conformation of chromatin. A third class occludes DNA-binding transcription factor protein-protein interaction domains. A fourth class of corepressors prevents interactions of DNA bound DNA-binding transcription factor with coactivators.
7 Q92317 (/IGI) Q92317 (/IGI) Q92317 (/IGI) Q92317 (/IGI) Q92317 (/IGI) Q92317 (/IGI) Q92317 (/IGI)
Transcription corepressor activity GO:0003714
A protein or a member of a complex that interacts specifically and non-covalently with a DNA-bound DNA-binding transcription factor to repress the transcription of specific genes. Corepressors often act by altering chromatin structure and modifications. For example, one class of transcription coregulators modifies chromatin structure through covalent modification of histones. A second ATP-dependent class modifies the conformation of chromatin. A third class occludes DNA-binding transcription factor protein-protein interaction domains. A fourth class of corepressors prevents interactions of DNA bound DNA-binding transcription factor with coactivators.
7 Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP)
DNA-binding transcription factor activity GO:0003700
A protein or a member of a complex that interacts selectively and non-covalently with a specific DNA sequence (sometimes referred to as a motif) within the regulatory region of a gene to modulate transcription. Regulatory regions include promoters (proximal and distal) and enhancers. Genes are transcriptional units, and include bacterial operons.
5 P49592 (/ISS) P49592 (/ISS) P49592 (/ISS) Q944I5 (/ISS) Q944I5 (/ISS)
Transcription factor binding GO:0008134
Interacting selectively and non-covalently with a transcription factor, a protein required to initiate or regulate transcription.
3 Q9VJQ5 (/IPI) Q9VJQ5 (/IPI) Q9VJQ5 (/IPI)
Transcription coactivator activity GO:0003713
A protein or a member of a complex that interacts specifically and non-covalently with a DNA-bound DNA-binding transcription factor to activate the transcription of specific genes. Coactivators often act by altering chromatin structure and modifications. For example, one class of transcription coregulators modifies chromatin structure through covalent modification of histones. A second ATP-dependent class modifies the conformation of chromatin. Another type of coregulator activity is the bridging of a DNA-binding transcription factor to the basal transcription machinery. The Mediator complex, which bridges transcription factors and RNA polymerase, is also a transcription coactivator.
1 Q5A0I6 (/IDA)
Transcription coactivator activity GO:0003713
A protein or a member of a complex that interacts specifically and non-covalently with a DNA-bound DNA-binding transcription factor to activate the transcription of specific genes. Coactivators often act by altering chromatin structure and modifications. For example, one class of transcription coregulators modifies chromatin structure through covalent modification of histones. A second ATP-dependent class modifies the conformation of chromatin. Another type of coregulator activity is the bridging of a DNA-binding transcription factor to the basal transcription machinery. The Mediator complex, which bridges transcription factors and RNA polymerase, is also a transcription coactivator.
1 Q5A0I6 (/IMP)
Transcription corepressor activity GO:0003714
A protein or a member of a complex that interacts specifically and non-covalently with a DNA-bound DNA-binding transcription factor to repress the transcription of specific genes. Corepressors often act by altering chromatin structure and modifications. For example, one class of transcription coregulators modifies chromatin structure through covalent modification of histones. A second ATP-dependent class modifies the conformation of chromatin. A third class occludes DNA-binding transcription factor protein-protein interaction domains. A fourth class of corepressors prevents interactions of DNA bound DNA-binding transcription factor with coactivators.
1 O14348 (/ISO)
TBP-class protein binding GO:0017025
Interacting selectively and non-covalently with a member of the class of TATA-binding proteins (TBP), including any of the TBP-related factors (TRFs).
1 Q91WV0 (/ISO)
Sequence-specific DNA binding GO:0043565
Interacting selectively and non-covalently with DNA of a specific nucleotide composition, e.g. GC-rich DNA binding, or with a specific sequence motif or type of DNA e.g. promotor binding or rDNA binding.
1 Q5A0I6 (/IDA)

There are 23 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
Negative regulation of transcription by RNA polymerase II GO:0000122
Any process that stops, prevents, or reduces the frequency, rate or extent of transcription mediated by RNA polymerase II.
32 Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS) Q01658 (/TAS)
(22 more)
Histone H3 acetylation GO:0043966
The modification of histone H3 by the addition of an acetyl group.
32 Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA)
(22 more)
Negative regulation of transcription by RNA polymerase II GO:0000122
Any process that stops, prevents, or reduces the frequency, rate or extent of transcription mediated by RNA polymerase II.
10 Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q9VJQ5 (/IDA) Q9VJQ5 (/IDA) Q9VJQ5 (/IDA)
Positive regulation of transcription by RNA polymerase II GO:0045944
Any process that activates or increases the frequency, rate or extent of transcription from an RNA polymerase II promoter.
10 Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q9VJQ5 (/IDA) Q9VJQ5 (/IDA) Q9VJQ5 (/IDA)
Negative regulation of transcription by RNA polymerase II GO:0000122
Any process that stops, prevents, or reduces the frequency, rate or extent of transcription mediated by RNA polymerase II.
7 Q92317 (/IGI) Q92317 (/IGI) Q92317 (/IGI) Q92317 (/IGI) Q92317 (/IGI) Q92317 (/IGI) Q92317 (/IGI)
Negative regulation of transcription by RNA polymerase II GO:0000122
Any process that stops, prevents, or reduces the frequency, rate or extent of transcription mediated by RNA polymerase II.
7 Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP)
Negative regulation of transcription by RNA polymerase III GO:0016480
Any process that stops, prevents, or reduces the frequency, rate or extent of transcription mediated by RNA polymerase III.
7 Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP)
Regulation of RNA polymerase II transcriptional preinitiation complex assembly GO:0045898
Any process that modulates the frequency, rate or extent of RNA polymerase II transcriptional preinitiation complex assembly.
7 Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP)
RNA polymerase II preinitiation complex assembly GO:0051123
The aggregation, arrangement and bonding together of proteins on an RNA polymerase II promoter DNA to form the transcriptional preinitiation complex (PIC), the formation of which is a prerequisite for transcription by RNA polymerase.
7 Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP)
Positive regulation of transcription from RNA polymerase II promoter in response to heat stress GO:0061408
Any process that increases the frequency, rate or extent of transcription from an RNA polymerase II promoter as a result of a heat stimulus, a temperature stimulus above the optimal temperature for that organism.
7 Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP) Q92317 (/IMP)
Regulation of transcription, DNA-templated GO:0006355
Any process that modulates the frequency, rate or extent of cellular DNA-templated transcription.
5 P49592 (/TAS) P49592 (/TAS) P49592 (/TAS) Q944I5 (/TAS) Q944I5 (/TAS)
Chromatin remodeling GO:0006338
Dynamic structural changes to eukaryotic chromatin occurring throughout the cell division cycle. These changes range from the local changes necessary for transcriptional regulation to global changes necessary for chromosome segregation.
3 Q9VJQ5 (/IDA) Q9VJQ5 (/IDA) Q9VJQ5 (/IDA)
Transcription by RNA polymerase II GO:0006366
The synthesis of RNA from a DNA template by RNA polymerase II (RNAP II), originating at an RNA polymerase II promoter. Includes transcription of messenger RNA (mRNA) and certain small nuclear RNAs (snRNAs).
3 Q9VJQ5 (/IMP) Q9VJQ5 (/IMP) Q9VJQ5 (/IMP)
Histone acetylation GO:0016573
The modification of a histone by the addition of an acetyl group.
3 Q9VJQ5 (/IDA) Q9VJQ5 (/IDA) Q9VJQ5 (/IDA)
Nucleosome mobilization GO:0042766
The movement of nucleosomes along a DNA fragment.
3 Q9VJQ5 (/IDA) Q9VJQ5 (/IDA) Q9VJQ5 (/IDA)
Negative regulation of transcription, DNA-templated GO:0045892
Any process that stops, prevents, or reduces the frequency, rate or extent of cellular DNA-templated transcription.
3 Q9VJQ5 (/IDA) Q9VJQ5 (/IDA) Q9VJQ5 (/IDA)
Positive regulation of transcription, DNA-templated GO:0045893
Any process that activates or increases the frequency, rate or extent of cellular DNA-templated transcription.
3 Q9VJQ5 (/IDA) Q9VJQ5 (/IDA) Q9VJQ5 (/IDA)
Negative regulation of transcription by RNA polymerase II GO:0000122
Any process that stops, prevents, or reduces the frequency, rate or extent of transcription mediated by RNA polymerase II.
1 O14348 (/ISO)
Cellular response to drug GO:0035690
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 drug stimulus. A drug is a substance used in the diagnosis, treatment or prevention of a disease.
1 Q5A0I6 (/IMP)
Regulation of transcription from RNA polymerase II promoter in response to stress GO:0043618
Any process that modulates the frequency, rate or extent of transcription from an RNA polymerase II promoter as a result of a stimulus indicating the organism is under stress. The stress is usually, but not necessarily, exogenous (e.g. temperature, humidity, ionizing radiation).
1 Q5A0I6 (/IDA)
Histone H3 acetylation GO:0043966
The modification of histone H3 by the addition of an acetyl group.
1 Q91WV0 (/ISO)
Regulation of RNA polymerase II transcriptional preinitiation complex assembly GO:0045898
Any process that modulates the frequency, rate or extent of RNA polymerase II transcriptional preinitiation complex assembly.
1 O14348 (/ISO)
Regulation of cellular response to drug GO:2001038
Any process that modulates the frequency, rate or extent of cellular response to drug.
1 Q5A0I6 (/IDA)

There are 9 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
Nucleus GO:0005634
A membrane-bounded organelle of eukaryotic cells in which chromosomes are housed and replicated. In most cells, the nucleus contains all of the cell's chromosomes except the organellar chromosomes, and is the site of RNA synthesis and processing. In some species, or in specialized cell types, RNA metabolism or DNA replication may be absent.
78 P49592 (/IDA) P49592 (/IDA) P49592 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA)
(68 more)
Ada2/Gcn5/Ada3 transcription activator complex GO:0005671
A multiprotein complex that possesses histone acetyltransferase and is involved in regulation of transcription. Contains either GCN5 or PCAF in a mutually exclusive manner. The budding yeast complex includes Gcn5p, two proteins of the Ada family, and two TBP-associate proteins (TAFs); analogous complexes in other species have analogous compositions, and usually contain homologs of the yeast proteins. Both ATAC- or SAGA (see GO:0000124, SAGA complex) are involved in the acetylation of histone H3K9 and K14 residues.
36 Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA) Q01658 (/IDA)
(26 more)
Negative cofactor 2 complex GO:0017054
A heterodimeric protein complex that can stably associate with TATA-binding protein on promoters, thereby preventing the assembly of transcription factors TFIIA and TFIIB and leading to repression of RNA polymerase II transcription. The two subunits, NC2alpha (Drap1) and NC2beta (Dr1), dimerize through histone fold domains of the H2A/H2B type present in the amino termini.
7 Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA) Q92317 (/IDA)
Negative cofactor 2 complex GO:0017054
A heterodimeric protein complex that can stably associate with TATA-binding protein on promoters, thereby preventing the assembly of transcription factors TFIIA and TFIIB and leading to repression of RNA polymerase II transcription. The two subunits, NC2alpha (Drap1) and NC2beta (Dr1), dimerize through histone fold domains of the H2A/H2B type present in the amino termini.
7 Q92317 (/IPI) Q92317 (/IPI) Q92317 (/IPI) Q92317 (/IPI) Q92317 (/IPI) Q92317 (/IPI) Q92317 (/IPI)
Ada2/Gcn5/Ada3 transcription activator complex GO:0005671
A multiprotein complex that possesses histone acetyltransferase and is involved in regulation of transcription. Contains either GCN5 or PCAF in a mutually exclusive manner. The budding yeast complex includes Gcn5p, two proteins of the Ada family, and two TBP-associate proteins (TAFs); analogous complexes in other species have analogous compositions, and usually contain homologs of the yeast proteins. Both ATAC- or SAGA (see GO:0000124, SAGA complex) are involved in the acetylation of histone H3K9 and K14 residues.
3 Q9VJQ5 (/IPI) Q9VJQ5 (/IPI) Q9VJQ5 (/IPI)
Nucleus GO:0005634
A membrane-bounded organelle of eukaryotic cells in which chromosomes are housed and replicated. In most cells, the nucleus contains all of the cell's chromosomes except the organellar chromosomes, and is the site of RNA synthesis and processing. In some species, or in specialized cell types, RNA metabolism or DNA replication may be absent.
1 O14348 (/HDA)
Nucleus GO:0005634
A membrane-bounded organelle of eukaryotic cells in which chromosomes are housed and replicated. In most cells, the nucleus contains all of the cell's chromosomes except the organellar chromosomes, and is the site of RNA synthesis and processing. In some species, or in specialized cell types, RNA metabolism or DNA replication may be absent.
1 Q91WV0 (/ISO)
Ada2/Gcn5/Ada3 transcription activator complex GO:0005671
A multiprotein complex that possesses histone acetyltransferase and is involved in regulation of transcription. Contains either GCN5 or PCAF in a mutually exclusive manner. The budding yeast complex includes Gcn5p, two proteins of the Ada family, and two TBP-associate proteins (TAFs); analogous complexes in other species have analogous compositions, and usually contain homologs of the yeast proteins. Both ATAC- or SAGA (see GO:0000124, SAGA complex) are involved in the acetylation of histone H3K9 and K14 residues.
1 Q91WV0 (/ISO)
Cytosol GO:0005829
The part of the cytoplasm that does not contain organelles but which does contain other particulate matter, such as protein complexes.
1 O14348 (/HDA)
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