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UniProtKB/Swiss-Prot O15146: Variant p.Ala727Val

Muscle, skeletal receptor tyrosine-protein kinase
Gene: MUSK
Variant information

Variant position:  727
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 Alanine (A) to Valine (V) at position 727 (A727V, p.Ala727Val).
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 small size and hydrophobic (A) to medium size and hydrophobic (V)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  0
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 CMS9; affects interaction with DOK7 and impairs MUSK phosphorylation; altered AChR clustering.
Any additional useful information about the variant.

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



Sequence information

Variant position:  727
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  869
The length of the canonical sequence.

Location on the sequence:   RQVAAGMAYLSERKFVHRDL  A TRNCLVGENMVVKIADFGLS
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                         RQVAAGMAYLSERKFVHRDLATRNCLVGENMVVKIADFGLS

Mouse                         RQVAAGMAYLSERKFVHRDLATRNCLVGETMVVKIADFGLS

Rat                           RQVAAGMAYLSERKFVHRDLATRNCLVGENMVVKIADFGLS

Chicken                       KQVAAGMAYLSERKFVHRDLATRNCLVGENMVVKIADFGLS

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 24 – 869 Muscle, skeletal receptor tyrosine-protein kinase
Topological domain 517 – 869 Cytoplasmic
Domain 575 – 856 Protein kinase
Active site 725 – 725 Proton acceptor
Mutagenesis 743 – 743 D -> N. Severe loss of kinase activity.


Literature citations

Mutations in MUSK causing congenital myasthenic syndrome impair MuSK-Dok-7 interaction.
Maselli R.A.; Arredondo J.; Cagney O.; Ng J.J.; Anderson J.A.; Williams C.; Gerke B.J.; Soliven B.; Wollmann R.L.;
Hum. Mol. Genet. 19:2370-2379(2010)
Cited for: VARIANTS CMS9 ILE-605 AND VAL-727; CHARACTERIZATION OF VARIANTS CMS9 ILE-605 AND VAL-727;

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.