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UniProtKB/Swiss-Prot P69905: Variant p.Ala22Asp

Hemoglobin subunit alpha
Gene: HBA2
Chromosomal location: 16p13.3
Variant information

Variant position:  22
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  Polymorphism
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 Alanine (A) to Aspartate (D) at position 22 (A22D, p.Ala22Asp).
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 small size and hydrophobic (A) to medium size and acidic (D)
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

Variant description:  In J-Nyanza.
Any additional useful information about the variant.

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



Sequence information

Variant position:  22
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  142
The length of the canonical sequence.

Location on the sequence:   VLSPADKTNVKAAWGKVGAH  A GEYGAEALERMFLSFPTTKT
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                         VLSPADKTNVKAAWGKVGAHAGEYGAEALERMFLSFPTTKT

Gorilla                       VLSPADKTNVKAAWGKVGAHAGDYGAEALERMFLSFPTTKT

                              VLSPADKTNIKSTWDKIGGHAGDYGGEALDRTFQSFPTTKT

Rhesus macaque                VLSPADKSNVKAAWGKVGGHAGEYGAEALERMFLSFPTTKT

Chimpanzee                    VLSPADKTNVKAAWGKVGAHAGEYGAEALERMFLSFPTTKT

Mouse                         VLSGEDKSNIKAAWGKIGGHGAEYGAEALERMFASFPTTKT

Rat                           VLSADDKTNIKNCWGKIGGHGGEYGEEALQRMFAAFPTTKT

Pig                           VLSAADKANVKAAWGKVGGQAGAHGAEALERMFLGFPTTKT

Bovine                        VLSAADKGNVKAAWGKVGGHAAEYGAEALERMFLSFPTTKT

Rabbit                        VLSPADKTNIKTAWEKIGSHGGEYGAEAVERMFLGFPTTKT

Sheep                         VLSAADKSNVKAAWGKVGGNAGAYGAEALERMFLSFPTTKT

Cat                           VLSAADKSNVKACWGKIGSHAGEYGAEALERTFCSFPTTKT

Horse                         VLSAADKTNVKAAWSKVGGHAGEYGAEALERMFLGFPTTKT

Chicken                       VLSAADKNNVKGIFTKIAGHAEEYGAETLERMFTTYPPTKT

Xenopus tropicalis            HLTADDKKHIKAIWPSVAAHGDKYGGEALHRMFMCAPKTKT

Zebrafish                     SLSDTDKAVVKAIWAKISPKADEIGAEALARMLTVYPQTKT

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 2 – 142 Hemoglobin subunit alpha
Site 12 – 12 Not glycated
Modified residue 4 – 4 Phosphoserine
Modified residue 8 – 8 N6-succinyllysine; alternate
Modified residue 9 – 9 Phosphothreonine
Modified residue 12 – 12 N6-succinyllysine
Modified residue 17 – 17 N6-acetyllysine; alternate
Modified residue 17 – 17 N6-succinyllysine; alternate
Modified residue 25 – 25 Phosphotyrosine
Modified residue 36 – 36 Phosphoserine
Modified residue 41 – 41 N6-succinyllysine; alternate
Glycosylation 8 – 8 N-linked (Glc) (glycation) lysine; alternate
Glycosylation 17 – 17 N-linked (Glc) (glycation) lysine; alternate
Glycosylation 41 – 41 N-linked (Glc) (glycation) lysine; alternate
Helix 22 – 36


Literature citations

No reference for the current variant in UniProtKB/Swiss-Prot.

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.