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: waiting to be named.

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 21: Galectin

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 13 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).
8 P05162 (/IPI) P09382 (/IPI) P09382 (/IPI) P09382 (/IPI) P09382 (/IPI) P11762 (/IPI) P16045 (/IPI) Q9D1U0 (/IPI)
RNA binding GO:0003723
Interacting selectively and non-covalently with an RNA molecule or a portion thereof.
4 P09382 (/HDA) P09382 (/HDA) P09382 (/HDA) P09382 (/HDA)
Galactoside binding GO:0016936
Interacting selectively and non-covalently with any glycoside in which the sugar group is galactose.
3 Q6IQI2 (/IDA) Q6TGN5 (/IDA) Q9Z144 (/IDA)
Carbohydrate binding GO:0030246
Interacting selectively and non-covalently with any carbohydrate, which includes monosaccharides, oligosaccharides and polysaccharides as well as substances derived from monosaccharides by reduction of the carbonyl group (alditols), by oxidation of one or more hydroxy groups to afford the corresponding aldehydes, ketones, or carboxylic acids, or by replacement of one or more hydroxy group(s) by a hydrogen atom. Cyclitols are generally not regarded as carbohydrates.
3 P16045 (/IDA) Q801X7 (/IDA) Q801X7 (/IDA)
Carbohydrate binding GO:0030246
Interacting selectively and non-covalently with any carbohydrate, which includes monosaccharides, oligosaccharides and polysaccharides as well as substances derived from monosaccharides by reduction of the carbonyl group (alditols), by oxidation of one or more hydroxy groups to afford the corresponding aldehydes, ketones, or carboxylic acids, or by replacement of one or more hydroxy group(s) by a hydrogen atom. Cyclitols are generally not regarded as carbohydrates.
3 P47929 (/TAS) P47929 (/TAS) P47929 (/TAS)
Laminin binding GO:0043236
Interacting selectively and non-covalently with laminins, glycoproteins that are major constituents of the basement membrane of cells.
3 P11762 (/IDA) Q6IQI2 (/IDA) Q6TGN5 (/IDA)
Lactose binding GO:0030395
Interacting selectively and non-covalently with lactose, a disaccharide of glucose and galactose, the carbohydrate of milk.
2 P11762 (/IDA) Q6DGJ1 (/IDA)
Galactose binding GO:0005534
Interacting selectively and non-covalently with the aldohexose galactose (galacto-hexose), a common constituent of many oligo- and polysaccharides.
1 P16045 (/NAS)
Galactoside binding GO:0016936
Interacting selectively and non-covalently with any glycoside in which the sugar group is galactose.
1 Q9CQW5 (/ISO)
Lactose binding GO:0030395
Interacting selectively and non-covalently with lactose, a disaccharide of glucose and galactose, the carbohydrate of milk.
1 P16045 (/ISO)
Protein homodimerization activity GO:0042803
Interacting selectively and non-covalently with an identical protein to form a homodimer.
1 P11762 (/IDA)
Protein homodimerization activity GO:0042803
Interacting selectively and non-covalently with an identical protein to form a homodimer.
1 P16045 (/ISO)
Laminin binding GO:0043236
Interacting selectively and non-covalently with laminins, glycoproteins that are major constituents of the basement membrane of cells.
1 P16045 (/ISO)

There are 30 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
Vasculature development GO:0001944
The process whose specific outcome is the progression of the vasculature over time, from its formation to the mature structure. The vasculature is an interconnected tubular multi-tissue structure that contains fluid that is actively transported around the organism.
7 A0A2R8QE25 (/IMP) F8W2I6 (/IMP) F8W2U6 (/IMP) I3ISQ0 (/IMP) Q6IQI2 (/IMP) Q6TGN5 (/IMP) Q7SXJ0 (/IMP)
Sprouting angiogenesis GO:0002040
The extension of new blood vessels from existing vessels into avascular tissues, this process includes the specialization of endothelial cells into leading tip and stalk cells, proliferation and migration of the endothelial cells and cell adhesion resulting in angiogenic sprout fusion or lumen formation.
7 A0A2R8QE25 (/IGI) F8W2I6 (/IGI) F8W2U6 (/IGI) I3ISQ0 (/IGI) Q6IQI2 (/IGI) Q6TGN5 (/IGI) Q7SXJ0 (/IGI)
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.
4 P09382 (/TAS) P09382 (/TAS) P09382 (/TAS) P09382 (/TAS)
Regulation of apoptotic process GO:0042981
Any process that modulates the occurrence or rate of cell death by apoptotic process.
4 P09382 (/TAS) P09382 (/TAS) P09382 (/TAS) P09382 (/TAS)
Positive regulation of I-kappaB kinase/NF-kappaB signaling GO:0043123
Any process that activates or increases the frequency, rate or extent of I-kappaB kinase/NF-kappaB signaling.
4 P09382 (/HMP) P09382 (/HMP) P09382 (/HMP) P09382 (/HMP)
Post-translational protein modification GO:0043687
The process of covalently altering one or more amino acids in a protein after the protein has been completely translated and released from the ribosome.
4 P09382 (/TAS) P09382 (/TAS) P09382 (/TAS) P09382 (/TAS)
Cellular protein metabolic process GO:0044267
The chemical reactions and pathways involving a specific protein, rather than of proteins in general, occurring at the level of an individual cell. Includes cellular protein modification.
4 P09382 (/TAS) P09382 (/TAS) P09382 (/TAS) P09382 (/TAS)
Positive regulation of viral entry into host cell GO:0046598
Any process that activates or increases the frequency, rate or extent of the introduction of viral entry into the host cell.
4 P09382 (/IDA) P09382 (/IDA) P09382 (/IDA) P09382 (/IDA)
Heterophilic cell-cell adhesion via plasma membrane cell adhesion molecules GO:0007157
The attachment of an adhesion molecule in one cell to a nonidentical adhesion molecule in an adjacent cell.
3 P47929 (/TAS) P47929 (/TAS) P47929 (/TAS)
Induction of bacterial agglutination GO:0043152
Any process in which infecting bacteria are clumped together by a host organism.
2 Q801X7 (/IDA) Q801X7 (/IDA)
Skeletal muscle fiber development GO:0048741
The process whose specific outcome is the progression of the skeletal muscle fiber over time, from its formation to the mature structure. Muscle fibers are formed by the maturation of myotubes. They can be classed as slow, intermediate/fast or fast.
2 Q6IQI2 (/IMP) Q6TGN5 (/IMP)
Positive regulation of neurogenesis GO:0050769
Any process that activates or increases the frequency, rate or extent of neurogenesis, the generation of cells within the nervous system.
2 Q6IQI2 (/IMP) Q6TGN5 (/IMP)
Defense response to Gram-positive bacterium GO:0050830
Reactions triggered in response to the presence of a Gram-positive bacterium that act to protect the cell or organism.
2 Q801X7 (/IDA) Q801X7 (/IDA)
Positive regulation of wound healing GO:0090303
Any process that increases the rate, frequency, or extent of the series of events that restore integrity to a damaged tissue, following an injury.
2 Q6IQI2 (/IMP) Q6TGN5 (/IMP)
Plasma cell differentiation GO:0002317
The process in which a B cell acquires the specialized features of a plasma cell. A plasma cell is a lymphocyte which develops from a B cell and produces high amounts of antibody.
1 P16045 (/IDA)
Heterophilic cell-cell adhesion via plasma membrane cell adhesion molecules GO:0007157
The attachment of an adhesion molecule in one cell to a nonidentical adhesion molecule in an adjacent cell.
1 P16045 (/NAS)
Negative regulation of cell-substrate adhesion GO:0010812
Any process that decreases the frequency, rate or extent of cell-substrate adhesion. Cell-substrate adhesion is the attachment of a cell to the underlying substrate via adhesion molecules.
1 P11762 (/IDA)
Negative regulation of cell-substrate adhesion GO:0010812
Any process that decreases the frequency, rate or extent of cell-substrate adhesion. Cell-substrate adhesion is the attachment of a cell to the underlying substrate via adhesion molecules.
1 P16045 (/ISO)
Negative regulation of neuron projection development GO:0010977
Any process that decreases the rate, frequency or extent of neuron projection development. Neuron projection development is the process whose specific outcome is the progression of a neuron projection over time, from its formation to the mature structure. A neuron projection is any process extending from a neural cell, such as axons or dendrites (collectively called neurites).
1 P11762 (/IMP)
Negative regulation of neuron projection development GO:0010977
Any process that decreases the rate, frequency or extent of neuron projection development. Neuron projection development is the process whose specific outcome is the progression of a neuron projection over time, from its formation to the mature structure. A neuron projection is any process extending from a neural cell, such as axons or dendrites (collectively called neurites).
1 P16045 (/ISO)
T cell costimulation GO:0031295
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.
1 P16045 (/IDA)
Positive regulation of erythrocyte aggregation GO:0034120
Any process that activates or increases the frequency, rate, or extent of erythrocyte aggregation.
1 P11762 (/IDA)
Positive regulation of erythrocyte aggregation GO:0034120
Any process that activates or increases the frequency, rate, or extent of erythrocyte aggregation.
1 P16045 (/ISO)
Response to isolation stress GO:0035900
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 a lack of contact with other members of the same species.
1 P11762 (/IEP)
Response to drug GO:0042493
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 a drug stimulus. A drug is a substance used in the diagnosis, treatment or prevention of a disease.
1 P11762 (/IEP)
Myoblast differentiation GO:0045445
The process in which a relatively unspecialized cell acquires specialized features of a myoblast. A myoblast is a mononucleate cell type that, by fusion with other myoblasts, gives rise to the myotubes that eventually develop into striated muscle fibers.
1 P16045 (/IDA)
Positive regulation of viral entry into host cell GO:0046598
Any process that activates or increases the frequency, rate or extent of the introduction of viral entry into the host cell.
1 P16045 (/ISO)
Response to axon injury GO:0048678
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 axon injury stimulus.
1 P11762 (/IEP)
Cellular response to glucose stimulus GO:0071333
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 glucose stimulus.
1 P11762 (/IEP)
Cellular response to organic cyclic compound GO:0071407
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 organic cyclic compound stimulus.
1 P11762 (/IEP)

There are 20 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
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.
7 P09382 (/HDA) P09382 (/HDA) P09382 (/HDA) P09382 (/HDA) P47929 (/HDA) P47929 (/HDA) P47929 (/HDA)
Extracellular space GO:0005615
That part of a multicellular organism outside the cells proper, usually taken to be outside the plasma membranes, and occupied by fluid.
5 P09382 (/HDA) P09382 (/HDA) P09382 (/HDA) P09382 (/HDA) P16045 (/HDA)
Collagen-containing extracellular matrix GO:0062023
An extracellular matrix consisting mainly of proteins (especially collagen) and glycosaminoglycans (mostly as proteoglycans) that provides not only essential physical scaffolding for the cellular constituents but can also initiate crucial biochemical and biomechanical cues required for tissue morphogenesis, differentiation and homeostasis. The components are secreted by cells in the vicinity and form a sheet underlying or overlying cells such as endothelial and epithelial cells.
5 P09382 (/HDA) P09382 (/HDA) P09382 (/HDA) P09382 (/HDA) P16045 (/HDA)
Extracellular region GO:0005576
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.
4 P09382 (/HDA) P09382 (/HDA) P09382 (/HDA) P09382 (/HDA)
Intracellular GO:0005622
The living contents of a cell; the matter contained within (but not including) the plasma membrane, usually taken to exclude large vacuoles and masses of secretory or ingested material. In eukaryotes it includes the nucleus and cytoplasm.
4 P09382 (/IDA) P09382 (/IDA) P09382 (/IDA) P09382 (/IDA)
Cytoplasm GO:0005737
All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
4 P09382 (/TAS) P09382 (/TAS) P09382 (/TAS) P09382 (/TAS)
Endoplasmic reticulum lumen GO:0005788
The volume enclosed by the membranes of the endoplasmic reticulum.
4 P09382 (/TAS) P09382 (/TAS) P09382 (/TAS) P09382 (/TAS)
Extracellular space GO:0005615
That part of a multicellular organism outside the cells proper, usually taken to be outside the plasma membranes, and occupied by fluid.
3 P47929 (/TAS) P47929 (/TAS) P47929 (/TAS)
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.
3 B5X805 (/IDA) B9ELC5 (/IDA) B9EM33 (/IDA)
Extracellular region GO:0005576
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.
2 Q801X7 (/IDA) Q801X7 (/IDA)
Extracellular region GO:0005576
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.
1 P16045 (/TAS)
Extracellular space GO:0005615
That part of a multicellular organism outside the cells proper, usually taken to be outside the plasma membranes, and occupied by fluid.
1 P16045 (/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.
1 P11762 (/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.
1 P16045 (/ISO)
Cytoplasm GO:0005737
All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
1 P11762 (/IDA)
Cytoplasm GO:0005737
All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
1 P16045 (/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 P11762 (/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.
1 P16045 (/ISO)
Cell surface GO:0009986
The external part of the cell wall and/or plasma membrane.
1 P11762 (/IDA)
Cell surface GO:0009986
The external part of the cell wall and/or plasma membrane.
1 P16045 (/ISO)
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