UniProtKB/Swiss-Prot Q16585: Variant p.Met100Lys

Beta-sarcoglycan
Gene: SGCB
Chromosomal location: 4q12
Variant information

Variant position:  100
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 Methionine (M) to Lysine (K) at position 100 (M100K, p.Met100Lys).
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 hydrophobic (M) to large size and basic (K)
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 LGMD2E.
Any additional useful information about the variant.

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



Sequence information

Variant position:  100
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  318
The length of the canonical sequence.

Location on the sequence:   LIITLVIWAVIRIGPNGCDS  M EFHESGLLRFKQVSDMGVIH
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                         LIITLVIWAVIRIGPNGCDSMEFHESGLLRFKQVSDMGVIH

Mouse                         LLITLVIWAVIRIGPNGCDSMEFHESGLLRFKQVSDMGVIH

Bovine                        LIITLVIWAVIRIGPNGCDSMEFHESGLLRFKQVSDMGVIH

Rabbit                        LIITLVIWAVIRIGPNGCDSMEFHESGLLRFKQVSDMGVIH

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 – 318 Beta-sarcoglycan
Topological domain 87 – 318 Extracellular
Compositional bias 97 – 314 Cys-rich


Literature citations

Genomic screening for beta-sarcoglycan gene mutations: missense mutations may cause severe limb-girdle muscular dystrophy type 2E (LGMD 2E).
Bonnemann C.G.; Passos-Bueno M.R.; McNally E.M.; Vainzof M.; de Sa Moreira E.; Marie S.K.; Pavanello R.C.; Noguchi S.; Ozawa E.; Zatz M.; Kunkel L.M.;
Hum. Mol. Genet. 5:1953-1961(1996)
Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA / MRNA] (ISOFORM 1); VARIANTS LGMD2E PRO-91; LYS-100 AND ARG-108;

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.