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UniProtKB/Swiss-Prot P69905: Variant p.Ala121Glu

Hemoglobin subunit alpha
Gene: HBA2
Variant information

Variant position:  121
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 Glutamate (E) at position 121 (A121E, p.Ala121Glu).
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 (E)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -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:  In J-Meerut/J-Birmingham.
Any additional useful information about the variant.

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



Sequence information

Variant position:  121
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:   LLSHCLLVTLAAHLPAEFTP  A VHASLDKFLASVSTVLTSKY
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                         LLSHCLLVTLAAHLPAEFTPAVHASLDKFLASVSTVLTSKY

Gorilla                       LLSHCLLVTLAAHLPAEFTPAVHASLDKFLASVSTVLTSKY

                              LLSHCLLVTLACHHPTEFTPAVHASLDKFFAAVSTVLTSKY

Rhesus macaque                LLSHCLLVTLAAHLPAEFTPAVHASLDKFLASVSTVLTSKY

Chimpanzee                    LLSHCLLVTLAAHLPAEFTPAVHASLDKFLASVSTVLTSKY

Mouse                         LLSHCLLVTLASHHPADFTPAVHASLDKFLASVSTVLTSKY

Rat                           FLSHCLLVTLACHHPGDFTPAMHASLDKFLASVSTVLTSKY

Pig                           LLSHCLLVTLAAHHPDDFNPSVHASLDKFLANVSTVLTSKY

Bovine                        LLSHSLLVTLASHLPSDFTPAVHASLDKFLANVSTVLTSKY

Rabbit                        LLSHCLLVTLANHHPSEFTPAVHASLDKFLANVSTVLTSKY

Sheep                         LLSHSLLVTLACHLPNDFTPAVHASLDKFLANVSTVLTSKY

Cat                           FLSHCLLVTLACHHPAEFTPAVHASLDKFFSAVSTVLTSKY

Horse                         LLSHCLLSTLAVHLPNDFTPAVHASLDKFLSSVSTVLTSKY

Chicken                       LLGQCFLVVVAIHHPAALTPEVHASLDKFLCAVGTVLTAKY

Xenopus tropicalis            LLAHQILVVVAIHFPKQFDPATHKALDKFLVSVSNVLTSKY

Zebrafish                     ILSHNVIVVIAMLFPADFTPEVHVSVDKFFNNLALALSEKY

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
Modified residue 103 – 103 Phosphoserine
Modified residue 109 – 109 Phosphothreonine
Modified residue 125 – 125 Phosphoserine
Modified residue 132 – 132 Phosphoserine
Modified residue 135 – 135 Phosphothreonine
Modified residue 138 – 138 Phosphothreonine
Modified residue 139 – 139 Phosphoserine
Helix 120 – 138


Literature citations

A case of HB J-Meerut (or Hb J-Birmingham) [alpha 120(H3)Ala-->Glu].
Yalcin A.; Avcu F.; Beyan C.; Guergey A.; Ural A.U.;
Hemoglobin 18:433-435(1994)
Cited for: VARIANT J-MEERUT/J-BIRMINGHAM GLU-121;

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.