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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P22557: Variant p.Asp263Asn

5-aminolevulinate synthase, erythroid-specific, mitochondrial
Gene: ALAS2
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Variant information Variant position: help 263 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help 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: help From Aspartate (D) to Asparagine (N) at position 263 (D263N, p.Asp263Asn). 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: help Change from medium size and acidic (D) to medium size and polar (N) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help 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

Variant description: help In SIDBA1; significantly reduced activity. Any additional useful information about the variant.


Sequence information Variant position: help 263 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 587 The length of the canonical sequence.
Location on the sequence: help LAELHQKDSALLFSSCFVAN D STLFTLAKILPGCEIYSDAG 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: help 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 50 – 587 5-aminolevulinate synthase, erythroid-specific, mitochondrial
Binding site 258 – 258 in other chain
Binding site 259 – 259 in other chain
Binding site 280 – 280
Helix 258 – 272



Literature citations
Sideroblastic anemia: molecular analysis of the ALAS2 gene in a series of 29 probands and functional studies of 10 missense mutations.
Ducamp S.; Kannengiesser C.; Touati M.; Garcon L.; Guerci-Bresler A.; Guichard J.F.; Vermylen C.; Dochir J.; Poirel H.A.; Fouyssac F.; Mansuy L.; Leroux G.; Tertian G.; Girot R.; Heimpel H.; Matthes T.; Talbi N.; Deybach J.C.; Beaumont C.; Puy H.; Grandchamp B.;
Hum. Mutat. 32:590-597(2011)
Cited for: VARIANTS SIDBA1 HIS-170; HIS-218; LYS-242; ASN-263; LEU-339; CYS-375; HIS-411; GLY-452 AND HIS-572; VARIANT LEU-520; CHARACTERIZATION OF VARIANTS SIDBA1 HIS-170; HIS-218; LYS-242; ASN-263; LEU-339; CYS-375; HIS-411; GLY-452 AND HIS-572; FUNCTION; CATALYTIC ACTIVITY;
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.