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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P35575: Variant p.Trp156Leu

Glucose-6-phosphatase catalytic subunit 1
Gene: G6PC1
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Variant information Variant position: help 156 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help 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: help From Tryptophan (W) to Leucine (L) at position 156 (W156L, p.Trp156Leu). 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 large size and aromatic (W) to medium size and hydrophobic (L) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -2 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 In GSD1A. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 156 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 357 The length of the canonical sequence.
Location on the sequence: help SIFQGKIKPTYRFRCLNVIL W LGFWAVQLNVCLSRIYLAAH 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: help The multiple alignment of the region surrounding the variant against various orthologous sequences. 
Human                         SIFQGKIKPTYRFRCLNVILWLGFWAVQLNVCLSRIYLAAH

Mouse                         AIFRGKKKPTYGFRCLNVILWLGFWAVQLNVCLSRIYLAAH

Rat                           AIFRGKKKSTYGFRCLNVVLWLGYWAVQLNVCLSRIYLAAH

Bovine                        SIFRGKKKPTYRFRCLNVMLWLGFWVVQLNVCLSRIYLAAH

Cat                           SMFRGKKKPTYRFRCLNVILWLGFWAVQLNVCLSRIYLAAH
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 – 357 Glucose-6-phosphatase catalytic subunit 1
Transmembrane 148 – 168 Helical
Active site 176 – 176 Nucleophile
Binding site 170 – 170
Alternative sequence 115 – 175 SPSGHAMGTAGVYYVMVTSTLSIFQGKIKPTYRFRCLNVILWLGFWAVQLNVCLSRIYLAA -> KDKADLQISVLECHFVVGILGCAAECLSVTNLPCCSFSSSSCCWSPVRHCCCRNFQPHPQH. In isoform 2.
Mutagenesis 176 – 176 H -> AIKMNSR. Loss of glucose-6-phosphatase activity.



Literature citations
Molecular genetic analysis of 40 patients with glycogen storage disease type Ia: 100% mutation detection rate and 5 novel mutations.
Seydewitz H.H.; Matern D.;
Hum. Mutat. 15:115-116(2000)
Cited for: VARIANTS GSD1A ARG-20; ARG-81; LEU-156 AND ASP-188; Glycogen storage disease type I: diagnosis and phenotype/genotype correlation.
Matern D.; Seydewitz H.H.; Bali D.; Lang C.; Chen Y.-T.;
Eur. J. Pediatr. 161:S10-S19(2002)
Cited for: VARIANTS GSD1A ARG-20; VAL-38; PRO-65; ARG-68; ARG-77; ARG-81; CYS-83; HIS-83; LYS-110; LEU-113; LEU-156; GLN-170; CYS-177; SER-178; ARG-188; SER-188; ARG-236; PRO-265; VAL-270; PHE-327 DEL AND ARG-345;
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.