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:

"
EF-hand
".

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 99: calpain-2 catalytic subunit

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
Calcium-dependent cysteine-type endopeptidase activity GO:0004198
Catalysis of the hydrolysis of nonterminal peptide bonds in a polypeptide chain by a mechanism using a cysteine residue at the enzyme active center, and requiring the presence of calcium.
8 P06814 (/ISS) P17655 (/ISS) Q27971 (/ISS) Q92178 (/ISS) Q9GLG1 (/ISS) Q9GLG1 (/ISS) Q9GLG1 (/ISS) Q9GLG1 (/ISS)
Calcium-dependent cysteine-type endopeptidase activity GO:0004198
Catalysis of the hydrolysis of nonterminal peptide bonds in a polypeptide chain by a mechanism using a cysteine residue at the enzyme active center, and requiring the presence of calcium.
4 O08529 (/IDA) P17655 (/IDA) Q07009 (/IDA) Q91VA3 (/IDA)
Protein tyrosine kinase binding GO:1990782
Interacting selectively and non-covalently with protein tyrosine kinase.
3 B6V3H8 (/IPI) E1BR22 (/IPI) Q92178 (/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).
2 P17655 (/IPI) Q07009 (/IPI)
Calcium-dependent cysteine-type endopeptidase activity GO:0004198
Catalysis of the hydrolysis of nonterminal peptide bonds in a polypeptide chain by a mechanism using a cysteine residue at the enzyme active center, and requiring the presence of calcium.
1 Q91VA3 (/IMP)
Calcium-dependent cysteine-type endopeptidase activity GO:0004198
Catalysis of the hydrolysis of nonterminal peptide bonds in a polypeptide chain by a mechanism using a cysteine residue at the enzyme active center, and requiring the presence of calcium.
1 O08529 (/ISO)
Calcium-dependent cysteine-type endopeptidase activity GO:0004198
Catalysis of the hydrolysis of nonterminal peptide bonds in a polypeptide chain by a mechanism using a cysteine residue at the enzyme active center, and requiring the presence of calcium.
1 O08529 (/TAS)
Calcium ion binding GO:0005509
Interacting selectively and non-covalently with calcium ions (Ca2+).
1 Q07009 (/IDA)
Calcium ion binding GO:0005509
Interacting selectively and non-covalently with calcium ions (Ca2+).
1 O08529 (/ISO)
Cytoskeletal protein binding GO:0008092
Interacting selectively and non-covalently with any protein component of any cytoskeleton (actin, microtubule, or intermediate filament cytoskeleton).
1 Q07009 (/IDA)
Cytoskeletal protein binding GO:0008092
Interacting selectively and non-covalently with any protein component of any cytoskeleton (actin, microtubule, or intermediate filament cytoskeleton).
1 O08529 (/ISO)
Cytoskeletal protein binding GO:0008092
Interacting selectively and non-covalently with any protein component of any cytoskeleton (actin, microtubule, or intermediate filament cytoskeleton).
1 P17655 (/NAS)
Peptidase activity GO:0008233
Catalysis of the hydrolysis of a peptide bond. A peptide bond is a covalent bond formed when the carbon atom from the carboxyl group of one amino acid shares electrons with the nitrogen atom from the amino group of a second amino acid.
1 O08529 (/IDA)
Cysteine-type peptidase activity GO:0008234
Catalysis of the hydrolysis of peptide bonds in a polypeptide chain by a mechanism in which the sulfhydryl group of a cysteine residue at the active center acts as a nucleophile.
1 P17655 (/TAS)
Enzyme binding GO:0019899
Interacting selectively and non-covalently with any enzyme.
1 Q07009 (/IPI)
Enzyme binding GO:0019899
Interacting selectively and non-covalently with any enzyme.
1 O08529 (/ISO)
Protein heterodimerization activity GO:0046982
Interacting selectively and non-covalently with a nonidentical protein to form a heterodimer.
1 Q07009 (/IPI)
Protein heterodimerization activity GO:0046982
Interacting selectively and non-covalently with a nonidentical protein to form a heterodimer.
1 O08529 (/ISO)

There are 35 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
Proteolysis GO:0006508
The hydrolysis of proteins into smaller polypeptides and/or amino acids by cleavage of their peptide bonds.
8 P06814 (/ISS) P17655 (/ISS) Q27971 (/ISS) Q92178 (/ISS) Q9GLG1 (/ISS) Q9GLG1 (/ISS) Q9GLG1 (/ISS) Q9GLG1 (/ISS)
Cellular response to amino acid stimulus GO:0071230
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 amino acid stimulus. An amino acid is a carboxylic acids containing one or more amino groups.
8 P06814 (/ISS) P17655 (/ISS) Q27971 (/ISS) Q92178 (/ISS) Q9GLG1 (/ISS) Q9GLG1 (/ISS) Q9GLG1 (/ISS) Q9GLG1 (/ISS)
Proteolysis GO:0006508
The hydrolysis of proteins into smaller polypeptides and/or amino acids by cleavage of their peptide bonds.
2 O08529 (/IDA) Q07009 (/IDA)
Cellular response to amino acid stimulus GO:0071230
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 amino acid stimulus. An amino acid is a carboxylic acids containing one or more amino groups.
2 O08529 (/IDA) Q07009 (/IDA)
Response to hypoxia GO:0001666
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 indicating lowered oxygen tension. Hypoxia, defined as a decline in O2 levels below normoxic levels of 20.8 - 20.95%, results in metabolic adaptation at both the cellular and organismal level.
1 Q07009 (/IEP)
Blastocyst development GO:0001824
The process whose specific outcome is the progression of the blastocyst over time, from its formation to the mature structure. The mammalian blastocyst is a hollow ball of cells containing two cell types, the inner cell mass and the trophectoderm.
1 O08529 (/IMP)
Proteolysis GO:0006508
The hydrolysis of proteins into smaller polypeptides and/or amino acids by cleavage of their peptide bonds.
1 O08529 (/ISO)
Proteolysis GO:0006508
The hydrolysis of proteins into smaller polypeptides and/or amino acids by cleavage of their peptide bonds.
1 Q07009 (/TAS)
Myoblast fusion GO:0007520
A process in which non-proliferating myoblasts fuse to existing fibers or to myotubes to form new fibers. A myoblast is a mononucleate cell type that, by fusion with other myoblasts, gives rise to the myotubes that eventually develop into skeletal muscle fibers.
1 O08529 (/IMP)
Female pregnancy GO:0007565
The set of physiological processes that allow an embryo or foetus to develop within the body of a female animal. It covers the time from fertilization of a female ovum by a male spermatozoon until birth.
1 Q07009 (/IEP)
Positive regulation of cardiac muscle cell apoptotic process GO:0010666
Any process that increases the rate or extent of cardiac cell apoptotic process, a form of programmed cell death induced by external or internal signals that trigger the activity of proteolytic caspases whose actions dismantle a cardiac muscle cell and result in its death.
1 Q07009 (/IMP)
Positive regulation of cardiac muscle cell apoptotic process GO:0010666
Any process that increases the rate or extent of cardiac cell apoptotic process, a form of programmed cell death induced by external or internal signals that trigger the activity of proteolytic caspases whose actions dismantle a cardiac muscle cell and result in its death.
1 O08529 (/ISO)
Protein autoprocessing GO:0016540
Processing which a protein carries out itself. This involves actions such as the autolytic removal of residues to generate the mature form of the protein.
1 Q07009 (/IC)
Protein autoprocessing GO:0016540
Processing which a protein carries out itself. This involves actions such as the autolytic removal of residues to generate the mature form of the protein.
1 Q07009 (/IDA)
Protein autoprocessing GO:0016540
Processing which a protein carries out itself. This involves actions such as the autolytic removal of residues to generate the mature form of the protein.
1 O08529 (/ISO)
Extracellular matrix disassembly GO:0022617
A process that results in the breakdown of the extracellular matrix.
1 P17655 (/TAS)
Regulation of interleukin-6 production GO:0032675
Any process that modulates the frequency, rate, or extent of interleukin-6 production.
1 Q07009 (/IMP)
Regulation of interleukin-6 production GO:0032675
Any process that modulates the frequency, rate, or extent of interleukin-6 production.
1 O08529 (/ISO)
Cellular response to interferon-beta GO:0035458
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 interferon-beta stimulus. Interferon-beta is a type I interferon.
1 Q07009 (/IEP)
Response to hydrogen peroxide GO:0042542
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 hydrogen peroxide (H2O2) stimulus.
1 Q07009 (/IEP)
Behavioral response to pain GO:0048266
Any process that results in a change in the behavior of an organism as a result of a pain stimulus. Pain stimuli cause activation of nociceptors, peripheral receptors for pain, include receptors which are sensitive to painful mechanical stimuli, extreme heat or cold, and chemical stimuli.
1 Q07009 (/IDA)
Behavioral response to pain GO:0048266
Any process that results in a change in the behavior of an organism as a result of a pain stimulus. Pain stimuli cause activation of nociceptors, peripheral receptors for pain, include receptors which are sensitive to painful mechanical stimuli, extreme heat or cold, and chemical stimuli.
1 O08529 (/ISO)
Protein homooligomerization GO:0051260
The process of creating protein oligomers, compounds composed of a small number, usually between three and ten, of identical component monomers. Oligomers may be formed by the polymerization of a number of monomers or the depolymerization of a large protein polymer.
1 Q91VA3 (/IPI)
Regulation of cytoskeleton organization GO:0051493
Any process that modulates the frequency, rate or extent of the formation, arrangement of constituent parts, or disassembly of cytoskeletal structures.
1 P17655 (/TAS)
Proteolysis involved in cellular protein catabolic process GO:0051603
The hydrolysis of a peptide bond or bonds within a protein as part of the chemical reactions and pathways resulting in the breakdown of a protein by individual cells.
1 P17655 (/IDA)
Proteolysis involved in cellular protein catabolic process GO:0051603
The hydrolysis of a peptide bond or bonds within a protein as part of the chemical reactions and pathways resulting in the breakdown of a protein by individual cells.
1 O08529 (/ISO)
Cellular response to lipopolysaccharide GO:0071222
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 lipopolysaccharide stimulus; lipopolysaccharide is a major component of the cell wall of gram-negative bacteria.
1 Q07009 (/IEP)
Cellular response to amino acid stimulus GO:0071230
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 amino acid stimulus. An amino acid is a carboxylic acids containing one or more amino groups.
1 O08529 (/ISO)
Positive regulation of neuron death GO:1901216
Any process that activates or increases the frequency, rate or extent of neuron death.
1 Q07009 (/IMP)
Positive regulation of neuron death GO:1901216
Any process that activates or increases the frequency, rate or extent of neuron death.
1 O08529 (/ISO)
Positive regulation of myoblast fusion GO:1901741
Any process that activates or increases the frequency, rate or extent of myoblast fusion.
1 Q07009 (/IMP)
Positive regulation of myoblast fusion GO:1901741
Any process that activates or increases the frequency, rate or extent of myoblast fusion.
1 O08529 (/ISO)
Calcium-dependent self proteolysis GO:1990092
The calcium-dependent hydrolysis of proteins into smaller polypeptides and/or amino acids by cleavage of their own peptide bonds.
1 Q91VA3 (/IDA)
Positive regulation of phosphatidylcholine biosynthetic process GO:2001247
Any process that activates or increases the frequency, rate or extent of phosphatidylcholine biosynthetic process.
1 Q07009 (/IMP)
Positive regulation of phosphatidylcholine biosynthetic process GO:2001247
Any process that activates or increases the frequency, rate or extent of phosphatidylcholine biosynthetic process.
1 O08529 (/ISO)

There are 42 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
Cytoplasm GO:0005737
All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
8 P06814 (/ISS) P17655 (/ISS) Q27971 (/ISS) Q92178 (/ISS) Q9GLG1 (/ISS) Q9GLG1 (/ISS) Q9GLG1 (/ISS) Q9GLG1 (/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.
8 P06814 (/ISS) P17655 (/ISS) Q27971 (/ISS) Q92178 (/ISS) Q9GLG1 (/ISS) Q9GLG1 (/ISS) Q9GLG1 (/ISS) Q9GLG1 (/ISS)
Cytosol GO:0005829
The part of the cytoplasm that does not contain organelles but which does contain other particulate matter, such as protein complexes.
3 O08529 (/IDA) P17655 (/IDA) Q07009 (/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 O08529 (/IDA) Q07009 (/IDA)
Cytoplasm GO:0005737
All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
2 O08529 (/IDA) Q07009 (/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 O08529 (/ISS) Q07009 (/ISS)
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.
2 O08529 (/ISS) Q07009 (/ISS)
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.
2 O08529 (/TAS) P17655 (/TAS)
Chromatin GO:0000785
The ordered and organized complex of DNA, protein, and sometimes RNA, that forms the chromosome.
1 O08529 (/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 O08529 (/ISO)
Cytoplasm GO:0005737
All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
1 O08529 (/ISO)
Cytoplasm GO:0005737
All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
1 Q07009 (/TAS)
Lysosome GO:0005764
A small lytic vacuole that has cell cycle-independent morphology and is found in most animal cells and that contains a variety of hydrolases, most of which have their maximal activities in the pH range 5-6. The contained enzymes display latency if properly isolated. About 40 different lysosomal hydrolases are known and lysosomes have a great variety of morphologies and functions.
1 O08529 (/IDA)
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).
1 P17655 (/IDA)
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).
1 O08529 (/ISO)
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.
1 P17655 (/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.
1 O08529 (/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 O08529 (/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 P17655 (/TAS)
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.
1 P17655 (/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.
1 O08529 (/ISO)
Focal adhesion GO:0005925
Small region on the surface of a cell that anchors the cell to the extracellular matrix and that forms a point of termination of actin filaments.
1 P17655 (/HDA)
Focal adhesion GO:0005925
Small region on the surface of a cell that anchors the cell to the extracellular matrix and that forms a point of termination of actin filaments.
1 Q07009 (/IDA)
Focal adhesion GO:0005925
Small region on the surface of a cell that anchors the cell to the extracellular matrix and that forms a point of termination of actin filaments.
1 O08529 (/ISO)
External side of plasma membrane GO:0009897
The leaflet of the plasma membrane that faces away from the cytoplasm and any proteins embedded or anchored in it or attached to its surface.
1 Q07009 (/IDA)
External side of plasma membrane GO:0009897
The leaflet of the plasma membrane that faces away from the cytoplasm and any proteins embedded or anchored in it or attached to its surface.
1 O08529 (/ISO)
Membrane GO:0016020
A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
1 Q07009 (/IDA)
Membrane GO:0016020
A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
1 O08529 (/ISO)
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 Q07009 (/IDA)
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 O08529 (/ISO)
Cortical actin cytoskeleton GO:0030864
The portion of the actin cytoskeleton, comprising filamentous actin and associated proteins, that lies just beneath the plasma membrane.
1 P17655 (/TAS)
Pseudopodium GO:0031143
A temporary protrusion or retractile process of a cell, associated with flowing movements of the protoplasm, and serving for locomotion and feeding.
1 P17655 (/IDA)
Pseudopodium GO:0031143
A temporary protrusion or retractile process of a cell, associated with flowing movements of the protoplasm, and serving for locomotion and feeding.
1 O08529 (/ISO)
Cell projection GO:0042995
A prolongation or process extending from a cell, e.g. a flagellum or axon.
1 Q07009 (/IDA)
Cell projection GO:0042995
A prolongation or process extending from a cell, e.g. a flagellum or axon.
1 O08529 (/ISO)
Neuronal cell body GO:0043025
The portion of a neuron that includes the nucleus, but excludes cell projections such as axons and dendrites.
1 Q07009 (/IDA)
Neuronal cell body GO:0043025
The portion of a neuron that includes the nucleus, but excludes cell projections such as axons and dendrites.
1 O08529 (/ISO)
Membrane raft GO:0045121
Any of the small (10-200 nm), heterogeneous, highly dynamic, sterol- and sphingolipid-enriched membrane domains that compartmentalize cellular processes. Small rafts can sometimes be stabilized to form larger platforms through protein-protein and protein-lipid interactions.
1 P17655 (/IDA)
Membrane raft GO:0045121
Any of the small (10-200 nm), heterogeneous, highly dynamic, sterol- and sphingolipid-enriched membrane domains that compartmentalize cellular processes. Small rafts can sometimes be stabilized to form larger platforms through protein-protein and protein-lipid interactions.
1 O08529 (/ISO)
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.
1 P17655 (/HDA)
Perinuclear endoplasmic reticulum GO:0097038
The portion of endoplasmic reticulum, the intracellular network of tubules and cisternae, that occurs near the nucleus. The lumen of the perinuclear endoplasmic reticulum is contiguous with the nuclear envelope lumen (also called perinuclear space), the region between the inner and outer nuclear membranes.
1 P17655 (/IDA)
Perinuclear endoplasmic reticulum GO:0097038
The portion of endoplasmic reticulum, the intracellular network of tubules and cisternae, that occurs near the nucleus. The lumen of the perinuclear endoplasmic reticulum is contiguous with the nuclear envelope lumen (also called perinuclear space), the region between the inner and outer nuclear membranes.
1 O08529 (/ISO)