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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P21439: Variant p.Val964Thr

Phosphatidylcholine translocator ABCB4
Gene: ABCB4
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Variant information Variant position: help 964 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help US 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 Valine (V) to Threonine (T) at position 964 (V964T, p.Val964Thr). 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 hydrophobic (V) to medium size and polar (T) 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 Found in patients with cholangitis; uncertain significance; requires 2 nucleotide substitutions. Any additional useful information about the variant.


Sequence information Variant position: help 964 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 1286 The length of the canonical sequence.
Location on the sequence: help SQAFMYFSYAGCFRFGAYLI V NGHMRFRDVILVFSAIVFGA 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.
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 – 1286 Phosphatidylcholine translocator ABCB4
Topological domain 957 – 972 Extracellular
Domain 711 – 999 ABC transmembrane type-1 2
Alternative sequence 929 – 975 Missing. In isoform 3.
Mutagenesis 953 – 953 A -> D. Accumulates predominantly in intracellular compartments with only a small fraction at the plasma membrane and inhibits partially the efflux activity for PC.
Helix 912 – 965



Literature citations
Aspects of liver pathology in adult patients with MDR3/ABCB4 gene mutations.
Wendum D.; Barbu V.; Rosmorduc O.; Arrive L.; Flejou J.F.; Poupon R.;
Virchows Arch. 460:291-298(2012)
Cited for: VARIANTS GBD1 MET-34; GLY-47; VAL-286 AND ASP-528; VARIANTS GLN-47; ALA-175; PHE-320; GLN-406; MET-775 AND THR-964;
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.