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UniProtKB/Swiss-Prot Q8IWU9: Variant p.Arg303Trp

Tryptophan 5-hydroxylase 2
Gene: TPH2
Variant information

Variant position:  303
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 Arginine (R) to Tryptophan (W) at position 303 (R303W, p.Arg303Trp).
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 large size and aromatic (W)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -3
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 ADHD7; has severely reduced solubility; is completely inactive; loss of function may lead to a reduced serotonin synthesis.
Any additional useful information about the variant.

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



Sequence information

Variant position:  303
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  490
The length of the canonical sequence.

Location on the sequence:   SPRDFLAGLAYRVFHCTQYI  R HGSDPLYTPEPDTCHELLGH
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                         SPRDFLAGLAYRVFHCTQYIRHGSDPLYTPEPDTCHELLGH

Rhesus macaque                SPRDFLAGLAYRVFHCTQYIRHGSDPLYTPEPDTCHELLGH

Mouse                         SPRDFLAGLAYRVFHCTQYVRHGSDPLYTPEPDTCHELLGH

Rat                           SPRDFLAGLAYRVFHCTQYVRHGSDPLYTPEPDTCHELLGH

Horse                         SPRDFLAGLAYRVFHCTQYVRHSSDPLYTPEPDTCHELLGH

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 – 490 Tryptophan 5-hydroxylase 2
Metal binding 318 – 318 Iron
Metal binding 323 – 323 Iron


Literature citations

A loss-of-function mutation in tryptophan hydroxylase 2 segregating with attention-deficit/hyperactivity disorder.
McKinney J.; Johansson S.; Halmoy A.; Dramsdahl M.; Winge I.; Knappskog P.M.; Haavik J.;
Mol. Psychiatry 13:365-367(2008)
Cited for: VARIANT ADHD7 TRP-303;

Functional properties of missense variants of human tryptophan hydroxylase 2.
McKinney J.A.; Turel B.; Winge I.; Knappskog P.M.; Haavik J.;
Hum. Mutat. 30:787-794(2009)
Cited for: CHARACTERIZATION OF VARIANTS VAL-36; PRO-36; TYR-41; CYS-55; SER-206; TRP-303; VAL-328; HIS-441 AND GLU-479;

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.