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UniProtKB/Swiss-Prot Q9H015: Variant p.Ile306Thr

Solute carrier family 22 member 4
Gene: SLC22A4
Variant information

Variant position:  306
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  LB/B
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:  From Isoleucine (I) to Threonine (T) at position 306 (I306T, p.Ile306Thr).
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 medium size and hydrophobic (I) to medium size and polar (T)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -1
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

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



Sequence information

Variant position:  306
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  551
The length of the canonical sequence.

Location on the sequence:   SQRRFREAEDIIQKAAKMNN  I AVPAVIFDSVEELNPLKQQK
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                         SQRRFREAEDIIQKAAKMNNIAVPAVIFDSVE--ELNPLKQQK

Mouse                         SQRRFAEAEQIIQKAAKMNSIVAPAGIFDPLELQELNSLKQ

Rat                           SQRRFEEAEQIIQKAAKMNGIMAPAVIFDPLELQELNSLKQ

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 – 551 Solute carrier family 22 member 4
Topological domain 279 – 337 Cytoplasmic


Literature citations

Cloning and characterization of a novel human pH-dependent organic cation transporter, OCTN1.
Tamai I.; Yabuuchi H.; Nezu J.; Sai Y.; Oku A.; Shimane M.; Tsuji A.;
FEBS Lett. 419:107-111(1997)
Cited for: NUCLEOTIDE SEQUENCE [MRNA]; TISSUE SPECIFICITY; BIOPHYSICOCHEMICAL PROPERTIES; VARIANTS THR-306 AND PHE-503;

Catalog of 238 variations among six human genes encoding solute carriers (hSLCs) in the Japanese population.
Saito S.; Iida A.; Sekine A.; Ogawa C.; Kawauchi S.; Higuchi S.; Nakamura Y.;
J. Hum. Genet. 47:576-584(2002)
Cited for: VARIANTS THR-306 AND GLU-462;

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.