UniProtKB/SwissProt variant VAR

Variant information

Variant position:

820

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

Type of variant:

Polymorphism

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 Isoleucine (I) at position 820 (R820I, p.Arg820Ile).

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 (I)

The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:

-3

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:

Transport properties comparable to wild-type.

Any additional useful information about the variant.

Other resources:

Links to websites of interest for the variant.

Variant rs11568659 [ dbSNP | Ensembl ]

Sequence information

Variant position:

820

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

Protein sequence length:

1325

The length of the canonical sequence.

Location on the sequence:

KMFESILKAPVLFFDRNPIG R ILNRFSKDIGHLDDLLPLTF

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:

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.

Type	Positions	Description
Chain	1 – 1325	Multidrug resistance-associated protein 4
Domain	714 – 1005	ABC transmembrane type-1 2

Literature citations

6-mercaptopurine and 9-(2-phosphonyl-methoxyethyl) adenine (PMEA) transport altered by two missense mutations in the drug transporter gene ABCC4.
Janke D.; Mehralivand S.; Strand D.; Goedtel-Armbrust U.; Habermeier A.; Gradhand U.; Fischer C.; Toliat M.R.; Fritz P.; Zanger U.M.; Schwab M.; Fromm M.F.; Nuernberg P.; Wojnowski L.; Closs E.I.; Lang T.;
Hum. Mutat. 29:659-669(2008)
Cited for: VARIANTS CYS-556; ILE-776; ILE-820; PHE-854 AND VAL-866; CHARACTERIZATION OF VARIANTS TRP-187; ASN-304; GLU-487; CYS-556; LYS-757; ILE-776; ILE-820; PHE-854; VAL-866 AND MET-1142;

UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot O15439: Variant p.Arg820Ile