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UniProtKB/Swiss-Prot P69905: Variant p.Ala64Asp

Hemoglobin subunit alpha
Gene: HBA2
Variant information

Variant position:  64
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  LB/B
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:  From Alanine (A) to Aspartate (D) at position 64 (A64D, p.Ala64Asp).
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 Pontoise; unstable.
Any additional useful information about the variant.

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



Sequence information

Variant position:  64
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:   FPHFDLSHGSAQVKGHGKKV  A DALTNAVAHVDDMPNALSAL
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                         FPHF-DLSHGSAQVKGHGKKVADALTNAVAHVDDMPNALSAL

Gorilla                       FPHF-DLSHGSAQVKGHGKKVADALTNAVAHVDDMPNALSA

                              FPHF-DLSPGSAQVKAHGKKVADALTTAVAHLDDLPGALSA

Rhesus macaque                FPHF-DLSHGSAQVKGHGKKVADALTLAVGHVDDMPNALSA

Chimpanzee                    FPHF-DLSHGSAQVKGHGKKVADALTNAVAHVDDMPNALSA

Mouse                         FPHF-DVSHGSAQVKGHGKKVADALASAAGHLDDLPGALSA

Rat                           FSHI-DVSPGSAQVKAHGKKVADALAKAADHVEDLPGALST

Pig                           FPHF-NLSHGSDQVKAHGQKVADALTKAVGHLDDLPGALSA

Bovine                        FPHF-DLSHGSAQVKGHGAKVAAALTKAVEHLDDLPGALSE

Rabbit                        FPHF-DFTHGSEQIKAHGKKVSEALTKAVGHLDDLPGALST

Sheep                         FPHF-DLSHGSAQVKGHGEKVAAALTKAVGHLDDLPGTLSD

Cat                           FPHF-DLSHGSAQVKAHGQKVADALTQAVAHMDDLPTAMSA

Horse                         FPHF-DLSHGSAQVKAHGKKVGDALTLAVGHLDDLPGALSN

Chicken                       FPHF-DLSHGSAQIKGHGKKVVAALIEAANHIDDIAGTLSK

Xenopus tropicalis            FPDF-DFSEHSKHILAHGKKVSDALNEACNHLDNIAGCLSK

Zebrafish                     FSHWADLSPGSGPVKKHGKTIMGAVGEAISKIDDLVGGLAA

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
Metal binding 59 – 59 Iron (heme b distal ligand)
Site 57 – 57 Not glycated
Site 61 – 61 Not glycated
Modified residue 50 – 50 Phosphoserine
Glycosylation 62 – 62 N-linked (Glc) (glycation) lysine
Helix 54 – 72


Literature citations

Hemoglobin Pontoise alpha63 Ala replaced by Asp(E12). A new fast moving variant.
Thillet J.; Blouquit Y.; Perrone F.; Rosa J.;
Biochim. Biophys. Acta 491:16-22(1977)
Cited for: VARIANT PONTOISE ASP-64;

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.