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:

"
Helix-loop-helix DNA-binding domain
".

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 131: Basic helix-loop-helix protein

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 7 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
RNA polymerase II proximal promoter sequence-specific DNA binding GO:0000978
Interacting selectively and non-covalently with a specific upstream regulatory DNA sequence (transcription factor recognition sequence or binding site) located in the proximal promoter of a gene transcribed by RNA polymerase II. The proximal promoter is in cis with and relatively close to the core promoter.
1 P17106 (/IDA)
RNA polymerase II activating transcription factor binding GO:0001102
Interacting selectively and non-covalently with an RNA polymerase II transcription activating factor, a protein involved in positive regulation of transcription.
1 P17106 (/IMP)
RNA polymerase II activating transcription factor binding GO:0001102
Interacting selectively and non-covalently with an RNA polymerase II transcription activating factor, a protein involved in positive regulation of transcription.
1 P17106 (/IPI)
RNA polymerase II repressing transcription factor binding GO:0001103
Interacting selectively and non-covalently with an RNA polymerase II transcription repressing factor, a protein involved in negative regulation of transcription.
1 P17106 (/IDA)
DNA-binding transcription repressor activity, RNA polymerase II-specific GO:0001227
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 repress or decrease transcription. Regulatory regions include promoters (proximal and distal) and enhancers. Genes are transcriptional units.
1 P17106 (/IDA)
DNA-binding transcription activator activity, RNA polymerase II-specific GO:0001228
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 activate or increase transcription. Regulatory regions include promoters (proximal and distal) and enhancers. Genes are transcriptional units.
1 P17106 (/IDA)
Centromeric DNA binding GO:0019237
Interacting selectively and non-covalently with a centromere, a region of chromosome where the spindle fibers attach during mitosis and meiosis.
1 P17106 (/IDA)

There are 10 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.
1 P17106 (/IMP)
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.
1 P17106 (/IDA)
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.
1 P17106 (/IMP)
Chromosome segregation GO:0007059
The process in which genetic material, in the form of chromosomes, is organized into specific structures and then physically separated and apportioned to two or more sets. In eukaryotes, chromosome segregation begins with the condensation of chromosomes, includes chromosome separation, and ends when chromosomes have completed movement to the spindle poles.
1 P17106 (/IGI)
Chromosome segregation GO:0007059
The process in which genetic material, in the form of chromosomes, is organized into specific structures and then physically separated and apportioned to two or more sets. In eukaryotes, chromosome segregation begins with the condensation of chromosomes, includes chromosome separation, and ends when chromosomes have completed movement to the spindle poles.
1 P17106 (/IMP)
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.
1 P17106 (/IMP)
Negative regulation of ceramide biosynthetic process by negative regulation of transcription from RNA Polymerase II promoter GO:0061427
Any process that stops, prevents, or reduces the frequency, rate or extent of transcription from an RNA polymerase II promoter and stops, prevents or reduces the frequency, rate or extent of a ceramide biosynthetic process.
1 P17106 (/IMP)
Regulation of transcription from RNA polymerase II promoter in response to methionine GO:0061432
Any process that modulates the frequency, rate or extent of transcription from an RNA polymerase II promoter as a result of a methionine stimulus.
1 P17106 (/IMP)
Positive regulation of inositol biosynthetic process by positive regulation of transcription from RNA polymerase II promoter GO:1900375
A positive regulation of transcription from RNA polymerase II promoter that results in positive regulation of inositol biosynthetic process.
1 P17106 (/IMP)
Positive regulation of sulfate assimilation by positive regulation of transcription from RNA polymerase II promoter GO:1900478
Any process that activates or increases the frequency, rate or extent of sulfate assimilation by activating or increasing the frequency, rate or extent of transcription from an RNA polymerase II promoter.
1 P17106 (/IMP)

There are 5 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
Chromosome, centromeric region GO:0000775
The region of a chromosome that includes the centromeric DNA and associated proteins. In monocentric chromosomes, this region corresponds to a single area of the chromosome, whereas in holocentric chromosomes, it is evenly distributed along the chromosome.
1 P17106 (/IDA)
Kinetochore GO:0000776
A multisubunit complex that is located at the centromeric region of DNA and provides an attachment point for the spindle microtubules.
1 P17106 (/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 P17106 (/HDA)
Mitochondrion GO:0005739
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.
1 P17106 (/HDA)
Cbf1-Met4-Met28 complex GO:0089713
A heteromeric complex consisting of Cbf1 and basic leucine zipper (bZIP) containing transcriptional activators, Met4 and Met28, that forms over the sequence TCACGTG in the upstream activating sequence (UAS) of genes involved in sulfur amino acid metabolism, resulting in their transcriptional activation.
1 P17106 (/IDA)
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