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:

"
Antithrombin, subunit I, domain 2
".

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 2: Serpin family B member 6

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 14 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
Serine-type endopeptidase inhibitor activity GO:0004867
Stops, prevents or reduces the activity of serine-type endopeptidases, enzymes that catalyze the hydrolysis of nonterminal peptide bonds in a polypeptide chain; a serine residue (and a histidine residue) are at the active center of the enzyme.
9 P01012 (/IDA) P01012 (/IDA) P35237 (/IDA) P35237 (/IDA) P35237 (/IDA) P50452 (/IDA) P50452 (/IDA) P50453 (/IDA) P50453 (/IDA)
Protease binding GO:0002020
Interacting selectively and non-covalently with any protease or peptidase.
7 P01012 (/IPI) P01012 (/IPI) P35237 (/IPI) P35237 (/IPI) P35237 (/IPI) P50453 (/IPI) P50453 (/IPI)
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).
7 P50452 (/IPI) P50452 (/IPI) P50453 (/IPI) P50453 (/IPI) Q60854 (/IPI) Q60854 (/IPI) Q8VHP7 (/IPI)
Serine-type endopeptidase inhibitor activity GO:0004867
Stops, prevents or reduces the activity of serine-type endopeptidases, enzymes that catalyze the hydrolysis of nonterminal peptide bonds in a polypeptide chain; a serine residue (and a histidine residue) are at the active center of the enzyme.
4 O08800 (/ISO) Q60854 (/ISO) Q60854 (/ISO) Q9D7P9 (/ISO)
Serine-type endopeptidase inhibitor activity GO:0004867
Stops, prevents or reduces the activity of serine-type endopeptidases, enzymes that catalyze the hydrolysis of nonterminal peptide bonds in a polypeptide chain; a serine residue (and a histidine residue) are at the active center of the enzyme.
3 O08804 (/NAS) Q60854 (/NAS) Q60854 (/NAS)
Serine-type endopeptidase inhibitor activity GO:0004867
Stops, prevents or reduces the activity of serine-type endopeptidases, enzymes that catalyze the hydrolysis of nonterminal peptide bonds in a polypeptide chain; a serine residue (and a histidine residue) are at the active center of the enzyme.
3 P35237 (/TAS) P35237 (/TAS) P35237 (/TAS)
Protease binding GO:0002020
Interacting selectively and non-covalently with any protease or peptidase.
2 Q60854 (/ISO) Q60854 (/ISO)
Calcium ion binding GO:0005509
Interacting selectively and non-covalently with calcium ions (Ca2+).
2 P01012 (/IDA) P01012 (/IDA)
Cysteine-type endopeptidase inhibitor activity involved in apoptotic process GO:0043027
Stops, prevents or reduces the activity of a cysteine-type endopeptidase involved in the apoptotic process.
2 P50453 (/IDA) P50453 (/IDA)
Cysteine-type endopeptidase inhibitor activity involved in apoptotic process GO:0043027
Stops, prevents or reduces the activity of a cysteine-type endopeptidase involved in the apoptotic process.
2 P50453 (/IMP) P50453 (/IMP)
Serine-type endopeptidase inhibitor activity GO:0004867
Stops, prevents or reduces the activity of serine-type endopeptidases, enzymes that catalyze the hydrolysis of nonterminal peptide bonds in a polypeptide chain; a serine residue (and a histidine residue) are at the active center of the enzyme.
1 Q96P63 (/IMP)
Serine-type endopeptidase inhibitor activity GO:0004867
Stops, prevents or reduces the activity of serine-type endopeptidases, enzymes that catalyze the hydrolysis of nonterminal peptide bonds in a polypeptide chain; a serine residue (and a histidine residue) are at the active center of the enzyme.
1 Q9D7P9 (/ISS)
Heparin binding GO:0008201
Interacting selectively and non-covalently with heparin, any member of a group of glycosaminoglycans found mainly as an intracellular component of mast cells and which consist predominantly of alternating alpha-(1->4)-linked D-galactose and N-acetyl-D-glucosamine-6-sulfate residues.
1 R9TNA6 (/IDA)
Enzyme binding GO:0019899
Interacting selectively and non-covalently with any enzyme.
1 Q96P63 (/NAS)

There are 34 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 endopeptidase activity GO:0010951
Any process that decreases the frequency, rate or extent of endopeptidase activity, the endohydrolysis of peptide bonds within proteins.
5 P35237 (/IDA) P35237 (/IDA) P35237 (/IDA) P50452 (/IDA) P50452 (/IDA)
Neutrophil degranulation GO:0043312
The regulated exocytosis of secretory granules containing preformed mediators such as proteases, lipases, and inflammatory mediators by a neutrophil.
4 P35237 (/TAS) P35237 (/TAS) P35237 (/TAS) Q96P63 (/TAS)
Sensory perception of sound GO:0007605
The series of events required for an organism to receive an auditory stimulus, convert it to a molecular signal, and recognize and characterize the signal. Sonic stimuli are detected in the form of vibrations and are processed to form a sound.
3 P35237 (/IMP) P35237 (/IMP) P35237 (/IMP)
Gonad development GO:0008406
The process whose specific outcome is the progression of the gonad over time, from its formation to the mature structure. The gonad is an animal organ that produces gametes; in some species it also produces hormones.
3 O08804 (/NAS) Q60854 (/NAS) Q60854 (/NAS)
Negative regulation of endopeptidase activity GO:0010951
Any process that decreases the frequency, rate or extent of endopeptidase activity, the endohydrolysis of peptide bonds within proteins.
3 O08800 (/ISO) Q60854 (/ISO) Q60854 (/ISO)
Negative regulation of endopeptidase activity GO:0010951
Any process that decreases the frequency, rate or extent of endopeptidase activity, the endohydrolysis of peptide bonds within proteins.
3 O08804 (/NAS) Q60854 (/NAS) Q60854 (/NAS)
Cellular response to osmotic stress GO:0071470
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 stimulus indicating an increase or decrease in the concentration of solutes outside the organism or cell.
3 P35237 (/IMP) P35237 (/IMP) P35237 (/IMP)
Mast cell mediated immunity GO:0002448
Any process involved in the carrying out of an immune response by a mast cell.
2 P50453 (/IEP) P50453 (/IEP)
Ion transport GO:0006811
The directed movement of charged atoms or small charged molecules into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.
2 P01012 (/TAS) P01012 (/TAS)
Immune response GO:0006955
Any immune system process that functions in the calibrated response of an organism to a potential internal or invasive threat.
2 P50453 (/IDA) P50453 (/IDA)
Sensory perception of sound GO:0007605
The series of events required for an organism to receive an auditory stimulus, convert it to a molecular signal, and recognize and characterize the signal. Sonic stimuli are detected in the form of vibrations and are processed to form a sound.
2 Q60854 (/ISO) Q60854 (/ISO)
Response to bacterium GO:0009617
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 stimulus from a bacterium.
2 P50453 (/IDA) P50453 (/IDA)
Embryo development ending in birth or egg hatching GO:0009792
The process whose specific outcome is the progression of an embryo over time, from zygote formation until the end of the embryonic life stage. The end of the embryonic life stage is organism-specific and may be somewhat arbitrary; for mammals it is usually considered to be birth, for insects the hatching of the first instar larva from the eggshell.
2 P01012 (/TAS) P01012 (/TAS)
Positive regulation of gene expression GO:0010628
Any process that increases the frequency, rate or extent of gene expression. Gene expression is the process in which a gene's coding sequence is converted into a mature gene product or products (proteins or RNA). This includes the production of an RNA transcript as well as any processing to produce a mature RNA product or an mRNA or circRNA (for protein-coding genes) and the translation of that mRNA or circRNA into protein. Protein maturation is included when required to form an active form of a product from an inactive precursor form.
2 P50453 (/IMP) P50453 (/IMP)
Negative regulation of endopeptidase activity GO:0010951
Any process that decreases the frequency, rate or extent of endopeptidase activity, the endohydrolysis of peptide bonds within proteins.
2 P50453 (/IMP) P50453 (/IMP)
Response to progesterone GO:0032570
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 progesterone stimulus.
2 P01012 (/IDA) P01012 (/IDA)
Negative regulation by symbiont of host apoptotic process GO:0033668
Any process in which an organism stops, prevents, or reduces the frequency, rate or extent of programmed cell death in the host, where programmed cell death proceeds by apoptosis. The host is defined as the larger of the organisms involved in a symbiotic interaction.
2 P50453 (/IMP) P50453 (/IMP)
Protection from natural killer cell mediated cytotoxicity GO:0042270
The process of protecting a cell from natural killer cell mediated cytotoxicity.
2 P50453 (/IMP) P50453 (/IMP)
Negative regulation of apoptotic process GO:0043066
Any process that stops, prevents, or reduces the frequency, rate or extent of cell death by apoptotic process.
2 P50453 (/IMP) P50453 (/IMP)
Response to estrogen GO:0043627
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 stimulus by an estrogen, C18 steroid hormones that can stimulate the development of female sexual characteristics.
2 P01012 (/IDA) P01012 (/IDA)
Response to steroid hormone GO:0048545
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 steroid hormone stimulus.
2 P01012 (/IDA) P01012 (/IDA)
Ion homeostasis GO:0050801
Any process involved in the maintenance of an internal steady state of ions within an organism or cell.
2 P01012 (/TAS) P01012 (/TAS)
Response to corticosterone GO:0051412
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 corticosterone stimulus. Corticosterone is a 21 carbon steroid hormone of the corticosteroid type, produced in the cortex of the adrenal glands. In many species, corticosterone is the principal glucocorticoid, involved in regulation of fuel metabolism, immune reactions, and stress responses.
2 P01012 (/IDA) P01012 (/IDA)
Cellular response to estrogen stimulus GO:0071391
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 stimulus by an estrogen, C18 steroid hormones that can stimulate the development of female sexual characteristics.
2 P50453 (/IEP) P50453 (/IEP)
Cellular response to osmotic stress GO:0071470
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 stimulus indicating an increase or decrease in the concentration of solutes outside the organism or cell.
2 Q60854 (/ISO) Q60854 (/ISO)
Amino acid homeostasis GO:0080144
Any process involved in the maintenance of an internal steady state of amino acid within an organism or cell.
2 P01012 (/TAS) P01012 (/TAS)
Epithelial cell-cell adhesion GO:0090136
The attachment of an epithelial cell to another epithelial cell via adhesion molecules.
2 P50452 (/IMP) P50452 (/IMP)
Hematopoietic progenitor cell differentiation GO:0002244
The process in which precursor cell type acquires the specialized features of a hematopoietic progenitor cell, a class of cell types including myeloid progenitor cells and lymphoid progenitor cells.
1 Q9D7P9 (/IMP)
Regulation of protein catabolic process GO:0042176
Any process that modulates the frequency, rate or extent of the chemical reactions and pathways resulting in the breakdown of a protein by the destruction of the native, active configuration, with or without the hydrolysis of peptide bonds.
1 Q8VHP7 (/IPI)
Negative regulation of protein catabolic process GO:0042177
Any process that stops, prevents, or reduces the frequency, rate or extent of the chemical reactions and pathways resulting in the breakdown of a protein by the destruction of the native, active configuration, with or without the hydrolysis of peptide bonds.
1 Q96P63 (/NAS)
Negative regulation of interleukin-1 beta secretion GO:0050713
Any process that stops, prevents, or reduces the frequency, rate or extent of the regulated release of interleukin-1 beta from a cell.
1 Q8VHP7 (/IMP)
Defense response to Gram-negative bacterium GO:0050829
Reactions triggered in response to the presence of a Gram-negative bacterium that act to protect the cell or organism.
1 R9TNA6 (/IDA)
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.
1 R9TNA6 (/IDA)
Epithelial cell-cell adhesion GO:0090136
The attachment of an epithelial cell to another epithelial cell via adhesion molecules.
1 O08800 (/ISO)

There are 31 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
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.
10 P35237 (/HDA) P35237 (/HDA) P35237 (/HDA) P50452 (/HDA) P50452 (/HDA) P50453 (/HDA) P50453 (/HDA) Q60854 (/HDA) Q60854 (/HDA) Q96P63 (/HDA)
Cytoplasm GO:0005737
All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
8 O08804 (/IDA) P35237 (/IDA) P35237 (/IDA) P35237 (/IDA) P50453 (/IDA) P50453 (/IDA) Q60854 (/IDA) Q60854 (/IDA)
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 P35237 (/HDA) P35237 (/HDA) P35237 (/HDA) P50452 (/HDA) P50452 (/HDA) P50453 (/HDA) P50453 (/HDA)
Cytosol GO:0005829
The part of the cytoplasm that does not contain organelles but which does contain other particulate matter, such as protein complexes.
6 A0A024QZT4 (/IDA) A0A024QZT4 (/IDA) P50452 (/IDA) P50452 (/IDA) P50453 (/IDA) P50453 (/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.
5 P01012 (/TAS) P01012 (/TAS) P35237 (/TAS) P35237 (/TAS) P35237 (/TAS)
Nucleoplasm GO:0005654
That part of the nuclear content other than the chromosomes or the nucleolus.
4 A0A024QZT4 (/IDA) A0A024QZT4 (/IDA) P50453 (/IDA) P50453 (/IDA)
Golgi apparatus GO:0005794
A compound membranous cytoplasmic organelle of eukaryotic cells, consisting of flattened, ribosome-free vesicles arranged in a more or less regular stack. The Golgi apparatus differs from the endoplasmic reticulum in often having slightly thicker membranes, appearing in sections as a characteristic shallow semicircle so that the convex side (cis or entry face) abuts the endoplasmic reticulum, secretory vesicles emerging from the concave side (trans or exit face). In vertebrate cells there is usually one such organelle, while in invertebrates and plants, where they are known usually as dictyosomes, there may be several scattered in the cytoplasm. The Golgi apparatus processes proteins produced on the ribosomes of the rough endoplasmic reticulum; such processing includes modification of the core oligosaccharides of glycoproteins, and the sorting and packaging of proteins for transport to a variety of cellular locations. Three different regions of the Golgi are now recognized both in terms of structure and function: cis, in the vicinity of the cis face, trans, in the vicinity of the trans face, and medial, lying between the cis and trans regions.
4 A0A024QZT4 (/IDA) A0A024QZT4 (/IDA) P50453 (/IDA) P50453 (/IDA)
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.
4 P35237 (/TAS) P35237 (/TAS) P35237 (/TAS) Q96P63 (/TAS)
Ficolin-1-rich granule membrane GO:0101003
The lipid bilayer surrounding a ficolin-1-rich granule.
4 P35237 (/TAS) P35237 (/TAS) P35237 (/TAS) Q96P63 (/TAS)
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.
3 P35237 (/HDA) P35237 (/HDA) P35237 (/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.
3 O08804 (/IDA) P50453 (/IDA) P50453 (/IDA)
Cytoplasm GO:0005737
All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
3 O02739 (/ISS) Q4R3G2 (/ISS) Q5R899 (/ISS)
Secretory granule membrane GO:0030667
The lipid bilayer surrounding a secretory granule.
3 P35237 (/TAS) P35237 (/TAS) P35237 (/TAS)
Tertiary granule membrane GO:0070821
The lipid bilayer surrounding a tertiary granule.
3 P35237 (/TAS) P35237 (/TAS) P35237 (/TAS)
Serine protease inhibitor complex GO:0097180
A heterodimeric protein complex that contains a serine protease inhibitor and a protease; formation of the complex inhibits serine protease activity.
3 P35237 (/IDA) P35237 (/IDA) P35237 (/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 P01014 (/IDA) P01014 (/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 P01012 (/TAS) P01012 (/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.
2 P50453 (/IDA) P50453 (/IDA)
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.
2 P01012 (/NAS) P01012 (/NAS)
Cytoplasm GO:0005737
All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
2 Q60854 (/ISO) Q60854 (/ISO)
Endoplasmic reticulum GO:0005783
The irregular network of unit membranes, visible only by electron microscopy, that occurs in the cytoplasm of many eukaryotic cells. The membranes form a complex meshwork of tubular channels, which are often expanded into slitlike cavities called cisternae. The ER takes two forms, rough (or granular), with ribosomes adhering to the outer surface, and smooth (with no ribosomes attached).
2 P01012 (/IDA) P01012 (/IDA)
Membrane GO:0016020
A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
2 P50453 (/HDA) P50453 (/HDA)
Early endosome lumen GO:0031905
The volume enclosed by the membrane of an early endosome.
2 P01012 (/TAS) P01012 (/TAS)
Vesicle GO:0031982
Any small, fluid-filled, spherical organelle enclosed by membrane.
2 P01012 (/IDA) P01012 (/IDA)
Phagolysosome GO:0032010
A membrane-bounded intracellular vesicle formed by maturation of an early phagosome following the ingestion of particulate material by phagocytosis; during maturation, phagosomes acquire markers of late endosomes and lysosomes.
2 P01012 (/TAS) P01012 (/TAS)
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.
2 P01012 (/IDA) P01012 (/IDA)
Phagocytic vesicle GO:0045335
A membrane-bounded intracellular vesicle that arises from the ingestion of particulate material by phagocytosis.
2 P01012 (/TAS) P01012 (/TAS)
Serine protease inhibitor complex GO:0097180
A heterodimeric protein complex that contains a serine protease inhibitor and a protease; formation of the complex inhibits serine protease activity.
2 Q60854 (/ISO) Q60854 (/ISO)
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 R9TNA6 (/IDA)
Cytoplasm GO:0005737
All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
1 Q96P63 (/NAS)
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 O08800 (/ISO)