UniProtKB/Swiss-Prot O43826: Variant p.Trp118Arg

Glucose-6-phosphate translocase
Gene: SLC37A4
Chromosomal location: 11q23.3
Variant information

Variant position:  118
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 have been found in patients and disease-association is reported in literature. However, this classification is not a definitive assessment of variant pathogenicity.
  • Polymorphism: No disease-association has been reported.
  • Unclassified: Variants have been found in patients but disease-association remains unclear.

Residue change:  From Tryptophan (W) to Arginine (R) at position 118 (W118R, p.Trp118Arg).
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 aromatic (W) to large size and basic (R)
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:  In GSD1B.
Any additional useful information about the variant.

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



Sequence information

Variant position:  118
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  429
The length of the canonical sequence.

Location on the sequence:   STVPVFAALWFLNGLAQGLG  W PPCGKVLRKWFEPSQFGTWW
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.

TypePositionsDescription
Chain 1 – 429 Glucose-6-phosphate translocase
Transmembrane 105 – 125 Helical


Literature citations

Genomic structure of the human glucose 6-phosphate translocase gene and novel mutations in the gene of a Japanese patient with glycogen storage disease type Ib.
Ihara K.; Kuromaru R.; Hara T.;
Hum. Genet. 103:493-496(1998)
Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA] (ISOFORM 1); VARIANT GSD1B ARG-118;

Molecular analysis of glycogen storage disease type Ib: identification of a prevalent mutation among Japanese patients and assignment of a putative glucose-6-phosphate translocase gene to chromosome 11.
Kure S.; Suzuki Y.; Matsubara Y.; Sakamoto O.; Shintaku H.; Isshiki G.; Hoshida C.; Izumi I.; Sakura N.; Narisawa K.;
Biochem. Biophys. Res. Commun. 248:426-431(1998)
Cited for: VARIANT GSD1B ARG-118;

Glycogen storage disease type Ib: structural and mutational analysis of the microsomal glucose-6-phosphate transporter gene.
Hou D.-C.; Kure S.; Suzuki Y.; Hasegawa Y.; Hara Y.; Inoue T.; Kida Y.; Matsubara Y.; Narisawa K.;
Am. J. Med. Genet. 86:253-257(1999)
Cited for: VARIANTS GSD1B ARG-118 AND VAL-235 DEL;

Genetic testing of glycogen storage disease type Ib in Japan: five novel G6PT1 mutations and a rapid detection method for a prevalent mutation W118R.
Kojima K.; Kure S.; Kamada F.; Hao K.; Ichinohe A.; Sato K.; Aoki Y.; Yoichi S.; Kubota M.; Horikawa R.; Utsumi A.; Miura M.; Ogawa S.; Kanazawa M.; Kohno Y.; Inokuchi M.; Hasegawa T.; Narisawa K.; Matsubara Y.;
Mol. Genet. Metab. 81:343-346(2004)
Cited for: VARIANT GSD1B ARG-118;

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.