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UniProtKB/Swiss-Prot Q16620: Variant p.Tyr706Cys

BDNF/NT-3 growth factors receptor
Gene: NTRK2
Chromosomal location: 9q22.1
Variant information

Variant position:  706
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 Tyrosine (Y) to Cysteine (C) at position 706 (Y706C, p.Tyr706Cys).
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 aromatic (Y) to medium size and polar (C)
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:  Obesity, hyperphagia, and developmental delay (OBHD) [MIM:613886]: A disorder characterized by early-onset obesity, hyperphagia, and severe developmental delay in motor function, speech, and language. {ECO:0000269|PubMed:15494731, ECO:0000269|PubMed:27884935, ECO:0000269|PubMed:29100083}. 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 OBHD; expressed normally on the cell surface; results in markedly impaired ligand-induced phosphorylation as well as impaired downstream MAPK1 phosphorylation.
Any additional useful information about the variant.

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



Sequence information

Variant position:  706
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  822
The length of the canonical sequence.

Location on the sequence:   ENLLVKIGDFGMSRDVYSTD  Y YRVGGHTMLPIRWMPPESIM
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                         ENLLVKIGDFGMSRDVYSTDYYRVGGHTMLPIRWMPPESIM

Mouse                         ENLLVKIGDFGMSRDVYSTDYYRVGGHTMLPIRWMPPESIM

Rat                           ENLLVKIGDFGMSRDVYSTDYYRVGGHTMLPIRWMPPESIM

Chicken                       ENLLVKIGDFGMSRDVYSTDYYRVGGHTMLPIRWMPPESIM

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 32 – 822 BDNF/NT-3 growth factors receptor
Topological domain 455 – 822 Cytoplasmic
Domain 538 – 807 Protein kinase
Site 706 – 706 Interaction with SH2D1A
Modified residue 702 – 702 Phosphotyrosine; by autocatalysis
Modified residue 706 – 706 Phosphotyrosine; by autocatalysis
Modified residue 707 – 707 Phosphotyrosine; by autocatalysis
Alternative sequence 478 – 822 Missing. In isoform TrkB-T1 and isoform TrkB-N-T1.
Alternative sequence 538 – 822 Missing. In isoform TrkB-T-Shc and isoform 5.


Literature citations

A de novo mutation affecting human TrkB associated with severe obesity and developmental delay.
Yeo G.S.; Connie Hung C.C.; Rochford J.; Keogh J.; Gray J.; Sivaramakrishnan S.; O'Rahilly S.; Farooqi I.S.;
Nat. Neurosci. 7:1187-1189(2004)
Cited for: VARIANT OBHD CYS-706; CHARACTERIZATION OF VARIANT OBHD CYS-706; FUNCTION AS A BDNF-ACTIVATED RECEPTOR; PHOSPHORYLATION; SUBCELLULAR LOCATION;

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.