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UniProtKB/Swiss-Prot O75712: Variant p.Arg42Pro

Gap junction beta-3 protein
Gene: GJB3
Chromosomal location: 1p34
Variant information

Variant position:  42
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  Disease [Disclaimer]
The variants are classified into three categories: Disease, Polymorphism and Unclassified.
  • Disease: Variants implicated in disease according to literature reports.
  • Polymorphism: Variants not reported to be implicated in disease.
  • Unclassified: Variants with uncertain implication in disease according to literature reports. Evidence against or in favor of a pathogenic role is limited and/or conflicting.

Residue change:  From Arginine (R) to Proline (P) at position 42 (R42P, p.Arg42Pro).
Indicates the amino acid change of the variant. The one-letter and three-letter codes for amino acids used in UniProtKB/Swiss-Prot are those adopted by the commission on Biochemical Nomenclature of the IUPAC-IUB.

Physico-chemical properties:  Change from large size and basic (R) to medium size and hydrophobic (P)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -2
The score within a Blosum matrix for the corresponding wild-type to variant amino acid change. The log-odds score measures the logarithm for the ratio of the likelihood of two amino acids appearing by chance. The Blosum62 substitution matrix is used. This substitution matrix contains scores for all possible exchanges of one amino acid with another:
  • Lowest score: -4 (low probability of substitution).
  • Highest score: 11 (high probability of substitution).
More information can be found on the following page

Involvement in disease:  Erythrokeratodermia variabilis et progressiva 1 (EKVP1) [MIM:133200]: A form of erythrokeratodermia variabilis et progressiva, a genodermatosis characterized by the coexistence of two independent skin lesions: transient erythema and hyperkeratosis that is usually localized but occasionally occurs in its generalized form. Clinical presentation varies significantly within a family and from one family to another. Palmoplantar keratoderma is present in around 50% of cases. {ECO:0000269|PubMed:10594760, ECO:0000269|PubMed:10798362, ECO:0000269|PubMed:9843209}. Note=The disease is caused by mutations affecting the gene represented in this entry.
The name and a short description of the disease associated with the variant. For more information about the disease, the user can refer to OMIM, following the link provided after the disease acronym.

Variant description:  In EKVP1.
Any additional useful information about the variant.

Other resources:  
Links to websites of interest for the variant.



Sequence information

Variant position:  42
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  270
The length of the canonical sequence.

Location on the sequence:   RIWLSVVFVFRVLVYVVAAE  R VWGDEQKDFDCNTKQPGCTN
The residue change on the sequence. Unless the variant is located at the beginning or at the end of the protein sequence, both residues upstream (20) and downstream (20) of the variant will be shown.

Residue conservation: 
The multiple alignment of the region surrounding the variant against various orthologous sequences.

Human                         RIWLSVVFVFRVLVYVVAAERVWGDEQKDFDCNTKQPGCTN

Mouse                         RIWLSVVFVFRVLVYVVAAERVWGDEQKDFDCNTRQPGCTN

Rat                           RIWLSVVFVFRVLVYVVAAERVWGDEQKDFDCNTRQPGCTN

Bovine                        RIWLSVVFVFRVLVYVVAAERVWGDEQKDFDCNTKQPGCTN

Sequence annotation in neighborhood:  
The regions or sites of interest surrounding the variant. In general the features listed are posttranslational modifications, binding sites, enzyme active sites, local secondary structure or other characteristics reported in the cited references. The "Sequence annotation in neighborhood" lines have a fixed format:
  • Type: the type of sequence feature.
  • Positions: endpoints of the sequence feature.
  • Description: contains additional information about the feature.

TypePositionsDescription
Chain 1 – 270 Gap junction beta-3 protein
Topological domain 41 – 75 Extracellular


Literature citations

Identification of a novel mutation R42P in the gap junction protein beta-3 associated with autosomal dominant erythrokeratoderma variabilis.
Wilgoss A.; Leigh I.M.; Barnes M.R.; Dopping-Hepenstal P.; Eady R.A.J.; Walter J.M.; Kennedy C.T.; Kelsell D.P.;
J. Invest. Dermatol. 113:1119-1122(1999)
Cited for: VARIANT EKVP1 PRO-42;

The spectrum of mutations in erythrokeratodermias -- novel and de novo mutations in GJB3.
Richard G.; Brown N.; Smith L.E.; Terrinoni A.; Melino G.; Mackie R.M.; Bale S.J.; Uitto J.;
Hum. Genet. 106:321-329(2000)
Cited for: VARIANTS EKVP1 PRO-42 AND LEU-137;

Disclaimer: Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. They are not in any way intended to be used as a substitute for professional medical advice, diagnostic, treatment or care.