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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P69905: Variant p.Leu126Pro

Hemoglobin subunit alpha
Gene: HBA2
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Variant information Variant position: help 126 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 Leucine (L) to Proline (P) at position 126 (L126P, p.Leu126Pro). 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 -3 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 Quong Sze; causes alpha-thalassemia. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 126 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 LLVTLAAHLPAEFTPAVHAS L DKFLASVSTVLTSKYR 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                         LLVTLAAHLPAEFTPAVHASLDKFLASVSTVLTSKYR

Gorilla                       LLVTLAAHLPAEFTPAVHASLDKFLASVSTVLTSKYR

                              LLVTLACHHPTEFTPAVHASLDKFFAAVSTVLTSKYR

Rhesus macaque                LLVTLAAHLPAEFTPAVHASLDKFLASVSTVLTSKYR

Chimpanzee                    LLVTLAAHLPAEFTPAVHASLDKFLASVSTVLTSKYR

Mouse                         LLVTLASHHPADFTPAVHASLDKFLASVSTVLTSKYR

Rat                           LLVTLACHHPGDFTPAMHASLDKFLASVSTVLTSKYR

Pig                           LLVTLAAHHPDDFNPSVHASLDKFLANVSTVLTSKYR

Bovine                        LLVTLASHLPSDFTPAVHASLDKFLANVSTVLTSKYR

Rabbit                        LLVTLANHHPSEFTPAVHASLDKFLANVSTVLTSKYR

Sheep                         LLVTLACHLPNDFTPAVHASLDKFLANVSTVLTSKYR

Cat                           LLVTLACHHPAEFTPAVHASLDKFFSAVSTVLTSKYR

Horse                         LLSTLAVHLPNDFTPAVHASLDKFLSSVSTVLTSKYR

Chicken                       FLVVVAIHHPAALTPEVHASLDKFLCAVGTVLTAKYR

Xenopus tropicalis            ILVVVAIHFPKQFDPATHKALDKFLVSVSNVLTSKYR

Zebrafish                     VIVVIAMLFPADFTPEVHVSVDKFFNNLALALSEKYR

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
Domain 2 – 142 Globin
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
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.