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UniProtKB/Swiss-Prot P35475: Variant p.Val620Phe

Alpha-L-iduronidase
Gene: IDUA
Chromosomal location: 4p16.3
Variant information

Variant position:  620
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 Valine (V) to Phenylalanine (F) at position 620 (V620F, p.Val620Phe).
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 (V) to large size and aromatic (F)
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:  Mucopolysaccharidosis 1H (MPS1H) [MIM:607014]: A severe form of mucopolysaccharidosis type 1, a rare lysosomal storage disease characterized by progressive physical deterioration with urinary excretion of dermatan sulfate and heparan sulfate. Patients with MPS1H usually present, within the first year of life, a combination of hepatosplenomegaly, skeletal deformities, corneal clouding and severe mental retardation. Obstructive airways disease, respiratory infection and cardiac complications usually result in death before 10 years of age. {ECO:0000269|PubMed:10466419, ECO:0000269|PubMed:10735634, ECO:0000269|PubMed:12559846, ECO:0000269|PubMed:1301941, ECO:0000269|PubMed:15300847, ECO:0000269|PubMed:19396826, ECO:0000269|PubMed:21394825, ECO:0000269|PubMed:24036510, ECO:0000269|PubMed:7550232, ECO:0000269|PubMed:7550242, ECO:0000269|PubMed:7951228, ECO:0000269|PubMed:8019563, ECO:0000269|PubMed:8328452, ECO:0000269|PubMed:8401515, ECO:0000269|Ref.20}. 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 MPS1H; loss of function; undetectable enzyme activity.
Any additional useful information about the variant.



Sequence information

Variant position:  620
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  653
The length of the canonical sequence.

Location on the sequence:   STFNLFVFSPDTGAVSGSYR  V RALDYWARPGPFSDPVPYLE
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                         STFNLFVFSPDTGAVSGSYRVRALDYWARPGPFSDPVPYLE

                              STFNLFVFSPESAVTSGSYRVRAVDYWARPGPFSTRVHYVE

Mouse                         STFNLFVFSPDTAVVSGSYRVRALDYWARPGPFSDPVTYLD

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 28 – 653 Alpha-L-iduronidase
Beta strand 616 – 624


Literature citations

Mucopolysaccharidosis type I in 21 Czech and Slovak patients: mutation analysis suggests a functional importance of C-terminus of the IDUA protein.
Vazna A.; Beesley C.; Berna L.; Stolnaja L.; Myskova H.; Bouckova M.; Vlaskova H.; Poupetova H.; Zeman J.; Magner M.; Hlavata A.; Winchester B.; Hrebicek M.; Dvorakova L.;
Am. J. Med. Genet. A 149A:965-974(2009)
Cited for: VARIANTS MPS1H TYR-315; PRO-327 AND PHE-620; CHARACTERIZATION OF VARIANTS MPS1H TYR-315 AND PHE-620; VARIANT MPS1S ARG-380; VARIANTS GLN-33; GLN-105; THR-361 AND ILE-454;

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.