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UniProtKB/Swiss-Prot P15289: Variant p.Leu68Pro

Arylsulfatase A
Gene: ARSA
Variant information

Variant position:  68
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 Leucine (L) to Proline (P) at position 68 (L68P, p.Leu68Pro).
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:  -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 MLD; late-infantile form.
Any additional useful information about the variant.

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

Sequence information

Variant position:  68
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  507
The length of the canonical sequence.

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.

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.

Chain 19 – 507 Arylsulfatase A
Chain 19 – 444 Arylsulfatase A component B
Active site 69 – 69 Nucleophile
Metal binding 69 – 69 Calcium; via 3-oxoalanine
Modified residue 69 – 69 3-oxoalanine (Cys)
Alternative sequence 1 – 84 Missing. In isoform 2.
Mutagenesis 69 – 69 C -> A. Abolishes enzyme activity.
Mutagenesis 69 – 69 C -> S. Abolishes formation of 3-oxoalanine (also known as C-formylglycine, FGly). Strongly decreases enzyme activity.
Beta strand 65 – 68

Literature citations

Identification of 12 novel mutations and two new polymorphisms in the arylsulfatase A gene: haplotype and genotype-phenotype correlation studies in Spanish metachromatic leukodystrophy patients.
Gort L.; Coll M.J.; Chabas A.;
Hum. Mutat. 14:240-248(1999)
Cited for: VARIANTS MLD SER-32; PRO-68; TRP-84; ALA-94; VAL-99; SER-136; VAL-212; TYR-227; HIS-255; HIS-288; ASP-308; ILE-327 AND LEU-377; VARIANTS CYS-193; SER-350 AND SER-391;

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.