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UniProtKB/Swiss-Prot P35575: Variant p.Thr255Ile

Glucose-6-phosphatase catalytic subunit 1
Gene: G6PC1
Variant information

Variant position:  255
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  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:  From Threonine (T) to Isoleucine (I) at position 255 (T255I, p.Thr255Ile).
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 polar (T) to medium size and hydrophobic (I)
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

Variant description:  In GSD1A.
Any additional useful information about the variant.



Sequence information

Variant position:  255
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  357
The length of the canonical sequence.

Location on the sequence:   LWTLEKAQRWCEQPEWVHID  T TPFASLLKNLGTLFGLGLAL
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                         LWTLEKAQRWCEQPEWVHIDTTPFASLLKNLGTLFGLGLAL

Mouse                         LWTLEKAKRWCERPEWVHLDTTPFASLFKNLGTLLGLGLAL

Rat                           LWTLEKAKRWCERPEWVHLDTTPFASLFKNLGTLLGLGLAL

Bovine                        LWTLEKAKRRCERPEWVHIDTTPFASLLKNLGTLFGLGLAL

Cat                           LWTLEKARRWCERPEWVHIDTTPFASLLKNVGTLFGLGLAL

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 – 357 Glucose-6-phosphatase catalytic subunit 1
Transmembrane 255 – 275 Helical
Alternative sequence 176 – 356 Missing. In isoform 2.
Mutagenesis 252 – 252 H -> A. Partial loss of glucose-6-phosphatase activity.


Literature citations

Mutation spectrum of the glucose-6-phosphatase gene and its implication in molecular diagnosis of Korean patients with glycogen storage disease type Ia.
Ki C.S.; Han S.H.; Kim H.J.; Lee S.G.; Kim E.J.; Kim J.W.; Choe Y.H.; Seo J.K.; Chang Y.J.; Park J.Y.;
Clin. Genet. 65:487-489(2004)
Cited for: VARIANTS GSD1A ASP-122; ALA-178 AND ILE-255;

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.