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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P29033: Variant p.Asn54Lys

Gap junction beta-2 protein
Gene: GJB2
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Variant information Variant position: help 54 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help LP/P [Disclaimer] The variants are classified into three categories: LP/P, LB/B and US.
  • LP/P: likely pathogenic or pathogenic.
  • LB/B: likely benign or benign.
  • US: uncertain significance
Residue change: help From Asparagine (N) to Lysine (K) at position 54 (N54K, p.Asn54Lys). 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: help Change from medium size and polar (N) to large size and basic (K) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help 0 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
Variant description: help In BAPS. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 54 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 226 The length of the canonical sequence.
Location on the sequence: help MILVVAAKEVWGDEQADFVC N TLQPGCKNVCYDHYFPISHI 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: help The multiple alignment of the region surrounding the variant against various orthologous sequences. 
Human                         MILVVAAKEVWGDEQADFVCNTLQPGCKNVCYDHYFPISHI

Gorilla                       MILVVAAKEVWGDEQADFVCNTLQPGCKNVCYDHYFPISHI

Rhesus macaque                MILVVAAKEVWGDEQADFVCNTLQPGCKNVCYDHYFPISHI

Mouse                         MILVVAAKEVWGDEQADFVCNTLQPGCKNVCYDHHFPISHI

Rat                           MILVVAAKEVWGDEQADFVCNTLQPGCKNVCYDHYFPISHI

Bovine                        MILVVAAKEVWGDEQADFVCNTLQPGCKNVCYDHYFPISHI

Sheep                         MILVVAAKEVWGDEQADFVCNTLQPGCKNVCYDHYFPISHI
Sequence annotation in neighborhood: help 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 – 226 Gap junction beta-2 protein
Topological domain 41 – 73 Extracellular
Binding site 42 – 42 in other chain
Binding site 45 – 45
Binding site 47 – 47
Disulfide bond 53 – 180
Mutagenesis 34 – 34 M -> A. Loss of gap junction ion conductance, probably due to very low open probability of the channels. Can form functional channels with wild-type, but with strongly reduced channel conductance. No visible effect on channel assembly and membrane insertion.
Beta strand 52 – 54



Literature citations
Expanding the phenotypic spectrum of Cx26 disorders: Bart-Pumphrey syndrome is caused by a novel missense mutation in GJB2.
Richard G.; Brown N.; Ishida-Yamamoto A.; Krol A.;
J. Invest. Dermatol. 123:856-863(2004)
Cited for: VARIANT BAPS LYS-54;
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.