UniProtKB/Swiss-Prot P02511: Variant p.Arg120Gly

Alpha-crystallin B chain
Chromosomal location: 11q22.3-q23.1
Variant information

Variant position:  120
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 Arginine (R) to Glycine (G) at position 120 (R120G, p.Arg120Gly).
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 basic (R) to glycine (G)
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:  Myopathy, myofibrillar, 2 (MFM2) [MIM:608810]: A neuromuscular disorder that results in weakness of the proximal and distal limb muscles, weakness of the neck, velopharynx and trunk muscles, hypertrophic cardiomyopathy, and cataract in a subset of patients. {ECO:0000269|PubMed:14681890, ECO:0000269|PubMed:21920752, ECO:0000269|PubMed:9731540}. 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 MFM2; decreased interactions with wild-type CRYAA and CRYAB but increased interactions with wild-type CRYBB2 and CRYGC.
Any additional useful information about the variant.

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

Sequence information

Variant position:  120
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  175
The length of the canonical sequence.

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.









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.

Chain 1 – 175 Alpha-crystallin B chain
Metal binding 104 – 104 Zinc 2
Metal binding 106 – 106 Zinc 2
Metal binding 111 – 111 Zinc 1
Metal binding 119 – 119 Zinc 1
Beta strand 112 – 123

Literature citations

A missense mutation in the alphaB-crystallin chaperone gene causes a desmin-related myopathy.
Vicart P.; Caron A.; Guicheney P.; Li Z.; Prevost M.-C.; Faure A.; Chateau D.; Chapon F.; Tome F.; Dupret J.-M.; Paulin D.; Fardeau M.;
Nat. Genet. 20:92-95(1998)
Cited for: VARIANT MFM2 GLY-120;

Alteration of protein-protein interactions of congenital cataract crystallin mutants.
Fu L.; Liang J.J.-N.;
Invest. Ophthalmol. Vis. Sci. 44:1155-1159(2003)

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.