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:

"
K Homology domain, type 1
".

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 17: Fragile X mental retardation syndrome-related prot...

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 17 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).
11 P51114 (/IPI) P51114 (/IPI) P51114 (/IPI) P51114 (/IPI) P51114 (/IPI) P51114 (/IPI) P51114 (/IPI) P51116 (/IPI) P51116 (/IPI) Q61584 (/IPI)
(1 more)
RNA binding GO:0003723
Interacting selectively and non-covalently with an RNA molecule or a portion thereof.
9 P51114 (/HDA) P51114 (/HDA) P51114 (/HDA) P51114 (/HDA) P51114 (/HDA) P51114 (/HDA) P51114 (/HDA) P51116 (/HDA) P51116 (/HDA)
RNA binding GO:0003723
Interacting selectively and non-covalently with an RNA molecule or a portion thereof.
9 P51114 (/TAS) P51114 (/TAS) P51114 (/TAS) P51114 (/TAS) P51114 (/TAS) P51114 (/TAS) P51114 (/TAS) P51116 (/TAS) P51116 (/TAS)
Protein homodimerization activity GO:0042803
Interacting selectively and non-covalently with an identical protein to form a homodimer.
9 P51114 (/IDA) P51114 (/IDA) P51114 (/IDA) P51114 (/IDA) P51114 (/IDA) P51114 (/IDA) P51114 (/IDA) P51116 (/IDA) P51116 (/IDA)
Protein homodimerization activity GO:0042803
Interacting selectively and non-covalently with an identical protein to form a homodimer.
9 O70523 (/ISS) P51115 (/ISS) Q2TBT7 (/ISS) Q5BJ56 (/ISS) Q5XI81 (/ISS) Q61584 (/ISS) Q7ZTQ5 (/ISS) Q7ZTQ5 (/ISS) Q9WVR4 (/ISS)
Protein heterodimerization activity GO:0046982
Interacting selectively and non-covalently with a nonidentical protein to form a heterodimer.
9 P51114 (/IDA) P51114 (/IDA) P51114 (/IDA) P51114 (/IDA) P51114 (/IDA) P51114 (/IDA) P51114 (/IDA) P51116 (/IDA) P51116 (/IDA)
Protein heterodimerization activity GO:0046982
Interacting selectively and non-covalently with a nonidentical protein to form a heterodimer.
9 O70523 (/ISS) P51115 (/ISS) Q2TBT7 (/ISS) Q5BJ56 (/ISS) Q5XI81 (/ISS) Q61584 (/ISS) Q7ZTQ5 (/ISS) Q7ZTQ5 (/ISS) Q9WVR4 (/ISS)
RNA strand annealing activity GO:0033592
Facilitates the base-pairing of complementary single-stranded RNA.
8 O70523 (/ISS) P51115 (/ISS) Q2TBT7 (/ISS) Q5BJ56 (/ISS) Q5XI81 (/ISS) Q61584 (/ISS) Q7ZTQ5 (/ISS) Q7ZTQ5 (/ISS)
RNA strand annealing activity GO:0033592
Facilitates the base-pairing of complementary single-stranded RNA.
7 P51114 (/IDA) P51114 (/IDA) P51114 (/IDA) P51114 (/IDA) P51114 (/IDA) P51114 (/IDA) P51114 (/IDA)
RNA binding GO:0003723
Interacting selectively and non-covalently with an RNA molecule or a portion thereof.
4 I3LAK5 (/ISS) Q5BJ56 (/ISS) Q7ZTQ5 (/ISS) Q7ZTQ5 (/ISS)
Identical protein binding GO:0042802
Interacting selectively and non-covalently with an identical protein or proteins.
2 P51116 (/IPI) P51116 (/IPI)
Protein homodimerization activity GO:0042803
Interacting selectively and non-covalently with an identical protein to form a homodimer.
2 Q61584 (/ISO) Q9WVR4 (/ISO)
Protein heterodimerization activity GO:0046982
Interacting selectively and non-covalently with a nonidentical protein to form a heterodimer.
2 Q61584 (/ISO) Q9WVR4 (/ISO)
RNA binding GO:0003723
Interacting selectively and non-covalently with an RNA molecule or a portion thereof.
1 P51115 (/IDA)
MRNA 3'-UTR binding GO:0003730
Interacting selectively and non-covalently with the 3' untranslated region of an mRNA molecule.
1 I3LAK5 (/ISS)
RNA strand annealing activity GO:0033592
Facilitates the base-pairing of complementary single-stranded RNA.
1 Q61584 (/ISO)
Identical protein binding GO:0042802
Interacting selectively and non-covalently with an identical protein or proteins.
1 Q9WVR4 (/ISO)

There are 12 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
Positive regulation of gene silencing by miRNA GO:2000637
Any process that activates or increases the frequency, rate or extent of gene silencing by miRNA.
8 O70523 (/ISS) P51115 (/ISS) Q2TBT7 (/ISS) Q5BJ56 (/ISS) Q5XI81 (/ISS) Q61584 (/ISS) Q7ZTQ5 (/ISS) Q7ZTQ5 (/ISS)
Apoptotic process GO:0006915
A programmed cell death process which begins when a cell receives an internal (e.g. DNA damage) or external signal (e.g. an extracellular death ligand), and proceeds through a series of biochemical events (signaling pathway phase) which trigger an execution phase. The execution phase is the last step of an apoptotic process, and is typically characterized by rounding-up of the cell, retraction of pseudopodes, reduction of cellular volume (pyknosis), chromatin condensation, nuclear fragmentation (karyorrhexis), plasma membrane blebbing and fragmentation of the cell into apoptotic bodies. When the execution phase is completed, the cell has died.
7 P51114 (/TAS) P51114 (/TAS) P51114 (/TAS) P51114 (/TAS) P51114 (/TAS) P51114 (/TAS) P51114 (/TAS)
Positive regulation of gene silencing by miRNA GO:2000637
Any process that activates or increases the frequency, rate or extent of gene silencing by miRNA.
7 P51114 (/IDA) P51114 (/IDA) P51114 (/IDA) P51114 (/IDA) P51114 (/IDA) P51114 (/IDA) P51114 (/IDA)
Somitogenesis GO:0001756
The formation of mesodermal clusters that are arranged segmentally along the anterior posterior axis of an embryo.
5 F1QLR3 (/IMP) F8W4G8 (/IMP) Q6NUW6 (/IMP) Q7SXA0 (/IMP) Q9PUN3 (/IMP)
Heart development GO:0007507
The process whose specific outcome is the progression of the heart over time, from its formation to the mature structure. The heart is a hollow, muscular organ, which, by contracting rhythmically, keeps up the circulation of the blood.
5 F1QLR3 (/IMP) F8W4G8 (/IMP) Q6NUW6 (/IMP) Q7SXA0 (/IMP) Q9PUN3 (/IMP)
Skeletal muscle tissue development GO:0007519
The developmental sequence of events leading to the formation of adult skeletal muscle tissue. The main events are: the fusion of myoblasts to form myotubes that increase in size by further fusion to them of myoblasts, the formation of myofibrils within their cytoplasm and the establishment of functional neuromuscular junctions with motor neurons. At this stage they can be regarded as mature muscle fibers.
5 F1QLR3 (/IMP) F8W4G8 (/IMP) Q6NUW6 (/IMP) Q7SXA0 (/IMP) Q9PUN3 (/IMP)
Muscle fiber development GO:0048747
The process whose specific outcome is the progression of the muscle fiber over time, from its formation to the mature structure. In skeletal muscle, fibers are formed by the maturation of myotubes. They can be classed as slow, intermediate/fast or fast.
5 F1QLR3 (/IMP) F8W4G8 (/IMP) Q6NUW6 (/IMP) Q7SXA0 (/IMP) Q9PUN3 (/IMP)
Muscle organ development GO:0007517
The process whose specific outcome is the progression of the muscle over time, from its formation to the mature structure. The muscle is an organ consisting of a tissue made up of various elongated cells that are specialized to contract and thus to produce movement and mechanical work.
4 I3LAK5 (/ISS) Q5BJ56 (/ISS) Q7ZTQ5 (/ISS) Q7ZTQ5 (/ISS)
Muscle organ development GO:0007517
The process whose specific outcome is the progression of the muscle over time, from its formation to the mature structure. The muscle is an organ consisting of a tissue made up of various elongated cells that are specialized to contract and thus to produce movement and mechanical work.
1 P51115 (/IDA)
Muscle organ development GO:0007517
The process whose specific outcome is the progression of the muscle over time, from its formation to the mature structure. The muscle is an organ consisting of a tissue made up of various elongated cells that are specialized to contract and thus to produce movement and mechanical work.
1 Q61584 (/IMP)
Negative regulation of translation GO:0017148
Any process that stops, prevents, or reduces the frequency, rate or extent of the chemical reactions and pathways resulting in the formation of proteins by the translation of mRNA or circRNA.
1 I3LAK5 (/ISS)
Positive regulation of gene silencing by miRNA GO:2000637
Any process that activates or increases the frequency, rate or extent of gene silencing by miRNA.
1 Q61584 (/ISO)

There are 30 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
Cytosol GO:0005829
The part of the cytoplasm that does not contain organelles but which does contain other particulate matter, such as protein complexes.
12 B4DXZ6 (/IDA) B4DXZ6 (/IDA) B4DXZ6 (/IDA) P51114 (/IDA) P51114 (/IDA) P51114 (/IDA) P51114 (/IDA) P51114 (/IDA) P51114 (/IDA) P51114 (/IDA)
(2 more)
Cytoplasm GO:0005737
All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
9 P51114 (/TAS) P51114 (/TAS) P51114 (/TAS) P51114 (/TAS) P51114 (/TAS) P51114 (/TAS) P51114 (/TAS) P51116 (/TAS) P51116 (/TAS)
Membrane GO:0016020
A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
9 P51114 (/HDA) P51114 (/HDA) P51114 (/HDA) P51114 (/HDA) P51114 (/HDA) P51114 (/HDA) P51114 (/HDA) P51116 (/HDA) P51116 (/HDA)
Nucleolus GO:0005730
A small, dense body one or more of which are present in the nucleus of eukaryotic cells. It is rich in RNA and protein, is not bounded by a limiting membrane, and is not seen during mitosis. Its prime function is the transcription of the nucleolar DNA into 45S ribosomal-precursor RNA, the processing of this RNA into 5.8S, 18S, and 28S components of ribosomal RNA, and the association of these components with 5S RNA and proteins synthesized outside the nucleolus. This association results in the formation of ribonucleoprotein precursors; these pass into the cytoplasm and mature into the 40S and 60S subunits of the ribosome.
7 P51114 (/TAS) P51114 (/TAS) P51114 (/TAS) P51114 (/TAS) P51114 (/TAS) P51114 (/TAS) P51114 (/TAS)
Polysome GO:0005844
A multiribosomal structure representing a linear array of ribosomes held together by messenger RNA. They represent the active complexes in cellular protein synthesis and are able to incorporate amino acids into polypeptides both in vivo and in vitro.
7 P51114 (/TAS) P51114 (/TAS) P51114 (/TAS) P51114 (/TAS) P51114 (/TAS) P51114 (/TAS) P51114 (/TAS)
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.
4 I3LAK5 (/ISS) P51115 (/ISS) Q7ZTQ5 (/ISS) Q7ZTQ5 (/ISS)
Cytoplasm GO:0005737
All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
4 I3LAK5 (/ISS) P51115 (/ISS) Q7ZTQ5 (/ISS) Q7ZTQ5 (/ISS)
Cytoplasm GO:0005737
All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
3 P51116 (/IDA) P51116 (/IDA) Q5BJ56 (/IDA)
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.
2 Q5BJ56 (/IDA) Q61584 (/IDA)
Cytosol GO:0005829
The part of the cytoplasm that does not contain organelles but which does contain other particulate matter, such as protein complexes.
2 Q61584 (/ISO) Q9WVR4 (/ISO)
Polysome GO:0005844
A multiribosomal structure representing a linear array of ribosomes held together by messenger RNA. They represent the active complexes in cellular protein synthesis and are able to incorporate amino acids into polypeptides both in vivo and in vitro.
2 Q61584 (/IDA) Q9WVR4 (/IDA)
Cytosolic large ribosomal subunit GO:0022625
The large subunit of a ribosome located in the cytosol.
2 P51116 (/TAS) P51116 (/TAS)
Dendrite GO:0030425
A neuron projection that has a short, tapering, morphology. Dendrites receive and integrate signals from other neurons or from sensory stimuli, and conduct nerve impulses towards the axon or the cell body. In most neurons, the impulse is conveyed from dendrites to axon via the cell body, but in some types of unipolar neuron, the impulse does not travel via the cell body.
2 Q61584 (/IDA) Q9WVR4 (/IDA)
Postsynapse GO:0098794
The part of a synapse that is part of the post-synaptic cell.
2 Q61584 (/IDA) Q9WVR4 (/IDA)
Glutamatergic synapse GO:0098978
A synapse that uses glutamate as a neurotransmitter.
2 Q61584 (/IDA) Q9WVR4 (/IDA)
Cell GO:0005623
The basic structural and functional unit of all organisms. Includes the plasma membrane and any external encapsulating structures such as the cell wall and cell envelope.
1 H0ZJZ2 (/IDA)
Cytoplasm GO:0005737
All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
1 Q9WVR4 (/ISO)
Polysome GO:0005844
A multiribosomal structure representing a linear array of ribosomes held together by messenger RNA. They represent the active complexes in cellular protein synthesis and are able to incorporate amino acids into polypeptides both in vivo and in vitro.
1 I3LAK5 (/ISS)
Membrane GO:0016020
A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
1 I3LAK5 (/ISS)
Axon GO:0030424
The long process of a neuron that conducts nerve impulses, usually away from the cell body to the terminals and varicosities, which are sites of storage and release of neurotransmitter.
1 Q61584 (/IDA)
Axon GO:0030424
The long process of a neuron that conducts nerve impulses, usually away from the cell body to the terminals and varicosities, which are sites of storage and release of neurotransmitter.
1 I3LAK5 (/ISS)
Dendrite GO:0030425
A neuron projection that has a short, tapering, morphology. Dendrites receive and integrate signals from other neurons or from sensory stimuli, and conduct nerve impulses towards the axon or the cell body. In most neurons, the impulse is conveyed from dendrites to axon via the cell body, but in some types of unipolar neuron, the impulse does not travel via the cell body.
1 I3LAK5 (/ISS)
Ribonucleoprotein granule GO:0035770
A non-membranous macromolecular complex containing proteins and translationally silenced mRNAs. RNA granules contain proteins that control the localization, stability, and translation of their RNA cargo. Different types of RNA granules (RGs) exist, depending on the cell type and cellular conditions.
1 Q61584 (/IDA)
Ribonucleoprotein granule GO:0035770
A non-membranous macromolecular complex containing proteins and translationally silenced mRNAs. RNA granules contain proteins that control the localization, stability, and translation of their RNA cargo. Different types of RNA granules (RGs) exist, depending on the cell type and cellular conditions.
1 I3LAK5 (/ISS)
Costamere GO:0043034
Regular periodic sub membranous arrays of vinculin in skeletal and cardiac muscle cells, these arrays link Z-discs to the sarcolemma and are associated with links to extracellular matrix.
1 Q61584 (/IDA)
Costamere GO:0043034
Regular periodic sub membranous arrays of vinculin in skeletal and cardiac muscle cells, these arrays link Z-discs to the sarcolemma and are associated with links to extracellular matrix.
1 I3LAK5 (/ISS)
Dendritic spine GO:0043197
A small, membranous protrusion from a dendrite that forms a postsynaptic compartment - typically receiving input from a single presynapse. They function as partially isolated biochemical and an electrical compartments. Spine morphology is variable including \thin\, \stubby\, \mushroom\, and \branched\, with a continuum of intermediate morphologies. They typically terminate in a bulb shape, linked to the dendritic shaft by a restriction. Spine remodeling is though to be involved in synaptic plasticity.
1 Q61584 (/IDA)
Dendritic spine GO:0043197
A small, membranous protrusion from a dendrite that forms a postsynaptic compartment - typically receiving input from a single presynapse. They function as partially isolated biochemical and an electrical compartments. Spine morphology is variable including \thin\, \stubby\, \mushroom\, and \branched\, with a continuum of intermediate morphologies. They typically terminate in a bulb shape, linked to the dendritic shaft by a restriction. Spine remodeling is though to be involved in synaptic plasticity.
1 I3LAK5 (/ISS)
Perinuclear region of cytoplasm GO:0048471
Cytoplasm situated near, or occurring around, the nucleus.
1 Q61584 (/IDA)
Perinuclear region of cytoplasm GO:0048471
Cytoplasm situated near, or occurring around, the nucleus.
1 I3LAK5 (/ISS)