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UniProtKB/Swiss-Prot P69905: Variant p.Val63Met

Hemoglobin subunit alpha
Gene: HBA2
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Variant information Variant position: help 63 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help 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: help From Valine (V) to Methionine (M) at position 63 (V63M, p.Val63Met). 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 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: 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 Evans; unstable. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 63 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 142 The length of the canonical sequence.
Location on the sequence: help YFPHFDLSHGSAQVKGHGKK V ADALTNAVAHVDDMPNALSA 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: help The multiple alignment of the region surrounding the variant against various orthologous sequences. 
Human                         YFPHF-DLSHGSAQVKGHGKKVADALTNAVAHVDDMPNALSA

Gorilla                       YFPHF-DLSHGSAQVKGHGKKVADALTNAVAHVDDMPNALS

Rhesus macaque                YFPHF-DLSHGSAQVKGHGKKVADALTLAVGHVDDMPNALS

Chimpanzee                    YFPHF-DLSHGSAQVKGHGKKVADALTNAVAHVDDMPNALS

Mouse                         YFPHF-DVSHGSAQVKGHGKKVADALASAAGHLDDLPGALS

Rat                           YFSHI-DVSPGSAQVKAHGKKVADALAKAADHVEDLPGALS

Pig                           YFPHF-NLSHGSDQVKAHGQKVADALTKAVGHLDDLPGALS

Bovine                        YFPHF-DLSHGSAQVKGHGAKVAAALTKAVEHLDDLPGALS

Rabbit                        YFPHF-DFTHGSEQIKAHGKKVSEALTKAVGHLDDLPGALS

Sheep                         YFPHF-DLSHGSAQVKGHGEKVAAALTKAVGHLDDLPGTLS

Cat                           YFPHF-DLSHGSAQVKAHGQKVADALTQAVAHMDDLPTAMS

Horse                         YFPHF-DLSHGSAQVKAHGKKVGDALTLAVGHLDDLPGALS

Chicken                       YFPHF-DLSHGSAQIKGHGKKVVAALIEAANHIDDIAGTLS

Xenopus tropicalis            YFPDF-DFSEHSKHILAHGKKVSDALNEACNHLDNIAGCLS

Zebrafish                     YFSHWADLSPGSGPVKKHGKTIMGAVGEAISKIDDLVGGLA
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 2 – 142 Hemoglobin subunit alpha
Binding site 59 – 59 distal binding residue
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
Unstable Hb 'Evans' (GTG->ATG/Val 62 Met) was detected on the alpha-2 globin gene of an Hispanic girl.
Kutlar F.; Elam D.; Hoff J.V.; Holley L.; Kutlar A.;
Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA] (HBA2); VARIANT EVANS MET-63; Hb Evans or alpha 262(E11)Val-->Met beta 2; an unstable hemoglobin causing a mild hemolytic anemia.
Wilson J.B.; Webber B.B.; Kutlar A.; Reese A.L.; McKie V.C.; Lutcher C.L.; Felice A.E.; Huisman T.H.J.;
Hemoglobin 13:557-566(1989)
Cited for: VARIANT EVANS MET-63;
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.