UniProtKB/SwissProt variant VAR

Variant information

Variant position:

77

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 Methionine (M) to Valine (V) at position 77 (M77V, p.Met77Val).

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:

Similar physico-chemical property. Both residues are medium size and hydrophobic.

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

Involvement in disease:

Neurofibromatosis 2 (NF2) [MIM:101000]: Genetic disorder characterized by bilateral vestibular schwannomas (formerly called acoustic neuromas), schwannomas of other cranial and peripheral nerves, meningiomas, and ependymomas. It is inherited in an autosomal dominant fashion with full penetrance. Affected individuals generally develop symptoms of eighth-nerve dysfunction in early adulthood, including deafness and balance disorder. Although the tumors of NF2 are histologically benign, their anatomic location makes management difficult, and patients suffer great morbidity and mortality. {ECO:0000269|PubMed:10090912, ECO:0000269|PubMed:10669747, ECO:0000269|PubMed:10790209, ECO:0000269|PubMed:12709270, ECO:0000269|PubMed:20178741, ECO:0000269|PubMed:20445339, ECO:0000269|PubMed:7666400, ECO:0000269|PubMed:7759081, ECO:0000269|PubMed:7913580, ECO:0000269|PubMed:8081368, ECO:0000269|PubMed:8230593, ECO:0000269|PubMed:8566958, ECO:0000269|PubMed:8698340, ECO:0000269|PubMed:9643284}. 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 NF2.

Any additional useful information about the variant.

Sequence information

Variant position:

77

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

Protein sequence length:

595

The length of the canonical sequence.

Location on the sequence:

RETWFFGLQYTIKDTVAWLK M DKKVLDHDVSKEEPVTFHFL

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                         RETWFFGLQYTIKDTVAWLKMDKKVLDHDVSKEEPVTFHFL

Mouse                         RETWFFGLQYTIKDTVAWLKMDKKVLDHDVSKEEPVTFHFL

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.

Type	Positions	Description
Chain	1 – 595	Merlin
Domain	22 – 311	FERM
Alternative sequence	39 – 121	Missing. In isoform 4 and isoform 10.
Alternative sequence	39 – 80	Missing. In isoform 6.
Mutagenesis	64 – 64	L -> P. Abolishes binding to AGAP2 and interaction with the CUL4A-RBX1-DDB1-VprBP/DCAF1 E3 ubiquitin-protein ligase complex.
Beta strand	77 – 80

Literature citations

Genotype/phenotype correlations in type 2 neurofibromatosis (NF2): evidence for more severe disease associated with truncating mutations.
Evans D.G.R.; Trueman L.; Wallace A.; Collins S.; Strachan T.;
J. Med. Genet. 35:450-455(1998)
Cited for: VARIANTS NF2 SER-62; VAL-77; GLY-106; MET-352; GLU-413 AND PRO-535;

UniProtKB/Swiss-Prot P35240: Variant p.Met77Val