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UniProtKB/Swiss-Prot P04080: Variant p.Gly4Arg

Cystatin-B
Gene: CSTB
Variant information

Variant position:  4
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 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 Glycine (G) to Arginine (R) at position 4 (G4R, p.Gly4Arg).
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 glycine (G) to large size and basic (R)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -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

Involvement in disease:  Epilepsy, progressive myoclonic 1 (EPM1) [MIM:254800]: An autosomal recessive disorder characterized by severe, stimulus-sensitive myoclonus and tonic-clonic seizures. The onset, occurring between 6 and 13 years of age, is characterized by convulsions. Myoclonus begins 1 to 5 years later. The twitchings occur predominantly in the proximal muscles of the extremities and are bilaterally symmetrical, although asynchronous. At first small, they become late in the clinical course so violent that the victim is thrown to the floor. Mental deterioration and eventually dementia develop. {ECO:0000269|PubMed:9012407}. Note=The disease is caused by mutations affecting the gene represented in this entry.
The name and a short description of the disease associated with the variant. For more information about the disease, the user can refer to OMIM, following the link provided after the disease acronym.

Variant description:  In EPM1.
Any additional useful information about the variant.

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



Sequence information

Variant position:  4
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  98
The length of the canonical sequence.

Location on the sequence:   MMC  G APSATQPATAETQHIADQVR
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                         MMCGAPSATQPATAETQHIADQVR

Gorilla                       MMCGAPSATQPATAETQHIADQVR

Chimpanzee                    MMCGAPSATQPATAETQHIADQVR

Mouse                         MMCGAPSATMPATAETQEVADQVK

Rat                           MMCGAPSATMPATTETQEIADKVK

Pig                           MMCGAPSATQPATAEIQAIADKVK

Bovine                        MMCGGTSATQPATAETQAIADKVK

Sheep                         MMCGAPSATQPATAETQAIADKVK

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 – 98 Cystatin-B
Site 4 – 4 Reactive site
Modified residue 1 – 1 N-acetylmethionine


Literature citations

Identification of mutations in cystatin B, the gene responsible for the Unverricht-Lundborg type of progressive myoclonus epilepsy (EPM1).
Lalioti M.D.; Mirotsou M.; Buresi C.; Peitsch M.C.; Rossier C.; Ouazzani R.; Baldy-Moulinier M.; Bottani A.; Malafosse A.; Antonarakis S.E.;
Am. J. Hum. Genet. 60:342-351(1997)
Cited for: VARIANT EPM1 ARG-4;

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.