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UniProtKB/Swiss-Prot P69905: Variant p.Asp7Ala

Hemoglobin subunit alpha
Gene: HBA2
Variant information

Variant position:  7
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 Aspartate (D) to Alanine (A) at position 7 (D7A, p.Asp7Ala).
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 acidic (D) to small size and hydrophobic (A)
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 Sawara; O(2) affinity up.
Any additional useful information about the variant.

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



Sequence information

Variant position:  7
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:   MVLSPA  D KTNVKAAWGKVGAHAGEYGA
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                         MVLSPADKTNVKAAWGKVGAHAGEYGA

Gorilla                       -VLSPADKTNVKAAWGKVGAHAGDYGA

                              -VLSPADKTNIKSTWDKIGGHAGDYGG

Rhesus macaque                MVLSPADKSNVKAAWGKVGGHAGEYGA

Chimpanzee                    MVLSPADKTNVKAAWGKVGAHAGEYGA

Mouse                         MVLSGEDKSNIKAAWGKIGGHGAEYGA

Rat                           MVLSADDKTNIKNCWGKIGGHGGEYGE

Pig                           -VLSAADKANVKAAWGKVGGQAGAHGA

Bovine                        MVLSAADKGNVKAAWGKVGGHAAEYGA

Rabbit                        MVLSPADKTNIKTAWEKIGSHGGEYGA

Sheep                         MVLSAADKSNVKAAWGKVGGNAGAYGA

Cat                           -VLSAADKSNVKACWGKIGSHAGEYGA

Horse                         MVLSAADKTNVKAAWSKVGGHAGEYGA

Chicken                       MVLSAADKNNVKGIFTKIAGHAEEYGA

Xenopus tropicalis            MHLTADDKKHIKAIWPSVAAHGDKYGG

Zebrafish                     MSLSDTDKAVVKAIWAKISPKADEIGA

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
Initiator methionine 1 – 1 Removed
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
Glycosylation 8 – 8 N-linked (Glc) (glycation) lysine; alternate
Glycosylation 17 – 17 N-linked (Glc) (glycation) lysine; alternate
Helix 5 – 18


Literature citations

Hemoglobin Sawara: alpha 6(A4) aspartic acid leads to alanine.
Sumida I.; Ohta Y.; Imamura T.; Yanase T.;
Biochim. Biophys. Acta 322:23-26(1973)
Cited for: VARIANT SAWARA ALA-7;

Increased oxygen affinity for hemoglobin Sawara: alphaA4(6) aspartic acid replaced by alanine.
Sasaki J.; Imamura T.; Sumida I.; Yanase T.; Ohya M.;
Biochim. Biophys. Acta 495:183-186(1977)
Cited for: CHARACTERIZATION OF VARIANT SAWARA ALA-7;

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.