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UniProtKB/Swiss-Prot P69905: Variant p.Ser132Pro

Hemoglobin subunit alpha
Gene: HBA2
Chromosomal location: 16p13.3
Variant information

Variant position:  132
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 Serine (S) to Proline (P) at position 132 (S132P, p.Ser132Pro).
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 polar (S) to medium size and hydrophobic (P)
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 Questembert; highly unstable; causes alpha-thalassemia.
Any additional useful information about the variant.

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



Sequence information

Variant position:  132
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:   AHLPAEFTPAVHASLDKFLA  S VSTVLTSKYR
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                         AHLPAEFTPAVHASLDKFLASVSTVLTSKYR

Gorilla                       AHLPAEFTPAVHASLDKFLASVSTVLTSKYR

                              CHHPTEFTPAVHASLDKFFAAVSTVLTSKYR

Rhesus macaque                AHLPAEFTPAVHASLDKFLASVSTVLTSKYR

Chimpanzee                    AHLPAEFTPAVHASLDKFLASVSTVLTSKYR

Mouse                         SHHPADFTPAVHASLDKFLASVSTVLTSKYR

Rat                           CHHPGDFTPAMHASLDKFLASVSTVLTSKYR

Pig                           AHHPDDFNPSVHASLDKFLANVSTVLTSKYR

Bovine                        SHLPSDFTPAVHASLDKFLANVSTVLTSKYR

Rabbit                        NHHPSEFTPAVHASLDKFLANVSTVLTSKYR

Sheep                         CHLPNDFTPAVHASLDKFLANVSTVLTSKYR

Cat                           CHHPAEFTPAVHASLDKFFSAVSTVLTSKYR

Horse                         VHLPNDFTPAVHASLDKFLSSVSTVLTSKYR

Chicken                       IHHPAALTPEVHASLDKFLCAVGTVLTAKYR

Xenopus tropicalis            IHFPKQFDPATHKALDKFLVSVSNVLTSKYR

Zebrafish                     MLFPADFTPEVHVSVDKFFNNLALALSEKYR

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 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

Unstable alpha-chain hemoglobin variants with factitious beta-thalassemia biosynthetic ratio: Hb Questembert (alpha 131[H14]Ser-->Pro) and Hb Caen (alpha 132[H15]Val-->Gly).
Wajcman H.; Vasseur C.; Blouquit Y.; Rosa J.; Labie D.; Najman A.; Reman O.; Leporrier M.; Galacteros F.;
Am. J. Hematol. 42:367-374(1993)
Cited for: VARIANT QUESTEMBERT PRO-132;

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.