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P-domain of calnexin/calreticulin superfamily

SCOP classification
Root:   SCOP hierarchy in SUPERFAMILY [ 0] (11)
Class:   All beta proteins [ 48724] (174)
Fold:   P-domain of calnexin/calreticulin [ 63886]
Superfamily:   P-domain of calnexin/calreticulin [ 63887]
Families:   P-domain of calnexin/calreticulin [ 63888] (2)


Superfamily statistics
Genomes (465) Uniprot 2017_06 genome PDB chains (SCOP 1.75)
Domains 1,427 3,326 4
Proteins 1,416 3,303 4


Functional annotation
General category Processes_IC
Detailed category Ion metabolism and transport

Document:
Function annotation of SCOP domain superfamilies

Gene Ontology (high-coverage)

(show details)
GO term FDR (all) SDFO level Annotation (direct or inherited)
Biological Process (BP) biological regulation 0.8082 Least Informative Inherited
Biological Process (BP) single-organism metabolic process 0.6525 Least Informative Inherited
Biological Process (BP) organonitrogen compound metabolic process 0.9097 Least Informative Inherited
Biological Process (BP) single-organism cellular process 1 Least Informative Inherited
Biological Process (BP) macromolecule metabolic process 0.9933 Least Informative Inherited
Biological Process (BP) primary metabolic process 1 Least Informative Inherited
Biological Process (BP) biosynthetic process 0.5817 Least Informative Inherited
Biological Process (BP) multicellular organismal process 0.7452 Least Informative Inherited
Biological Process (BP) regulation of biological quality 0.0001333 Moderately Informative Direct
Biological Process (BP) regulation of localization 0.009315 Moderately Informative Inherited
Biological Process (BP) pigment metabolic process 0.0000000004351 Informative Direct
Biological Process (BP) regulation of ion transport 0.000583 Informative Direct
Biological Process (BP) vesicle-mediated transport 0.0009961 Informative Direct
Biological Process (BP) regulation of cellular localization 0.001474 Informative Inherited
Biological Process (BP) protein folding 0.0000000000009337 Highly Informative Direct
Biological Process (BP) regulation of ion homeostasis 0.000000001679 Highly Informative Direct
Biological Process (BP) regulation of calcium ion transport 0.000000002038 Highly Informative Direct
Biological Process (BP) pigmentation 0.000000003694 Highly Informative Direct
Biological Process (BP) regulation of protein stability 0.000000004621 Highly Informative Direct
Biological Process (BP) multicellular organismal homeostasis 0.00000008887 Highly Informative Direct
Biological Process (BP) anatomical structure homeostasis 0.0005361 Highly Informative Direct
Molecular Function (MF) binding 0.563 Least Informative Inherited
Molecular Function (MF) metal ion binding 0.00000000000004304 Moderately Informative Direct
Molecular Function (MF) calcium ion binding 0 Highly Informative Direct
Cellular Component (CC) intracellular organelle part 0 Least Informative Direct
Cellular Component (CC) cytoplasmic part 0 Least Informative Direct
Cellular Component (CC) intracellular membrane-bounded organelle 0 Least Informative Direct
Cellular Component (CC) membrane 0 Least Informative Direct
Cellular Component (CC) endomembrane system 0 Moderately Informative Direct
Cellular Component (CC) intrinsic component of membrane 1 Moderately Informative Inherited
Cellular Component (CC) intracellular organelle lumen 1 Moderately Informative Inherited
Cellular Component (CC) endoplasmic reticulum membrane 0 Informative Direct
Cellular Component (CC) integral component of endoplasmic reticulum membrane 0.00000001333 Highly Informative Direct
Cellular Component (CC) perinuclear region of cytoplasm 0.0008918 Highly Informative Direct

Document: GO annotation of SCOP domains

UniProtKB KeyWords (KW)

(show details)
KW termFDR (all)SDKW levelAnnotation (direct or inherited)
Cellular componentEndoplasmic reticulum0Moderately InformativeDirect
Cellular componentSarcoplasmic reticulum0Highly InformativeDirect
DomainRepeat0Least InformativeDirect
DomainSignal0Least InformativeDirect
DomainTransmembrane0.2443Least InformativeInherited
Molecular functionZinc0.000000000001388Least InformativeDirect
Molecular functionMetal-binding0.00000000006369Least InformativeDirect
Molecular functionCalcium0Moderately InformativeDirect
Molecular functionLectin0InformativeDirect
Post-translational modificationChaperone0InformativeDirect
Post-translational modificationDisulfide bond0Least InformativeDirect
Post-translational modificationGlycoprotein0.00009974Least InformativeDirect
Post-translational modificationPalmitate0.000009298Moderately InformativeDirect

Document: KW annotation of SCOP domains

InterPro annotation
Cross references IPR009033 SSF63887 Protein matches
Abstract

The type-I integral membrane protein calnexin (CNX) and its soluble paralog calreticulin (CRT) are members of a family of molecular chaperones that function in the endoplasmic reticulum (ER) of eukaryotic cells. These calcium-binding proteins are lectins that bind newly synthesised N-linked glycoproteins to help promote efficient folding and oligomeric assembly. The chaperones act to retain the glycoproteins in the ER while they are still incompletely folded, ensuring that the ER quality control machinery can dispose of misfolded glycoproteins. The family of molecular chaperones are conserved among plants, fungi, and animals.

The P domain contains a high-affinity calcium-binding site and is thought to be involved in either substrate binding or protein-protein interactions. The P domain forms part of the lumenal region in CNX. In both CRT and CNX the P domain forms a protrusion, or arm, extending from the core protein. The amino acid sequence of the P domain is highly conserved and is characteristic for this family of lectins. The structure of the P domain consists of a non-globular proline-rich hairpin fold. The P domain is composed of multiple copies of two types of proline-rich repeat sequences, a 17 amino acid type 1 motif and a 14 amino acid type 2 motif, with the arrangement 111222 in CRT and 11112222 in CNX [PubMed11248044, PubMed11583625].


InterPro database


PDBeMotif information about ligands, sequence and structure motifs
Cross references PDB entries
Ligand binding statistics
Nucleic-acid binding statistics
Occurrence of secondary structure elements
Occurrence of small 3D structural motifs

PDBeMotif resource

Jump to [ Top of page · SCOP classification · InterPro annotation · PDBeMotif links · Functional annotation · Gene Ontology (high-coverage) · UniProtKB KeyWords (KW) ]

Internal database links

Browse genome assignments for this superfamily. The SUPERFAMILY hidden Markov model library has been used to carry out SCOP domain assignments to all genomes at the superfamily level.


Alignments of sequences to 2 models in this superfamily are available by clicking on the 'Alignments' icon above. PDB sequences less than 40% identical are shown by default, but any other sequence(s) may be aligned. Select PDB sequences, genome sequences, or paste in or upload your own sequences.


Browse and view proteins in genomes which have different domain combinations including a P-domain of calnexin/calreticulin domain.


Examine the distribution of domain superfamilies, or families, across the major taxonomic kingdoms or genomes within a kingdom. This gives an immediate impression of how superfamilies, or families, are restricted to certain kingdoms of life.


Explore domain occurrence network where nodes represent genomes and edges are domain architectures (shared between genomes) containing the superfamily of interest.

There are 2 hidden Markov models representing the P-domain of calnexin/calreticulin superfamily. Information on how the models are built, and plots showing hydrophobicity, match emmission probabilities and insertion/deletion probabilities can be inspected.


Jump to [ Top of page · SCOP classification · InterPro annotation · PDBeMotif links · Functional annotation · Gene Ontology (high-coverage) · UniProtKB KeyWords (KW) · Internal database links ]