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UniProtKB/Swiss-Prot P69905: Variant p.Lys91Met

Hemoglobin subunit alpha
Gene: HBA2
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Variant information Variant position: help 91 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 Lysine (K) to Methionine (M) at position 91 (K91M, p.Lys91Met). 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 Change from large size and basic (K) to medium size and hydrophobic (M) 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 Handa; O(2) affinity up. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 91 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 VAHVDDMPNALSALSDLHAH K LRVDPVNFKLLSHCLLVTLA 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                         VAHVDDMPNALSALSDLHAHKLRVDPVNFKLLSHCLLVTLA

Gorilla                       VAHVDDMPNALSALSDLHAHKLRVDPVNFKLLSHCLLVTLA

Rhesus macaque                VGHVDDMPNALSALSDLHAHKLRVDPVNFKLLSHCLLVTLA

Chimpanzee                    VAHVDDMPNALSALSDLHAHKLRVDPVNFKLLSHCLLVTLA

Mouse                         AGHLDDLPGALSALSDLHAHKLRVDPVNFKLLSHCLLVTLA

Rat                           ADHVEDLPGALSTLSDLHAHKLRVDPVNFKFLSHCLLVTLA

Pig                           VGHLDDLPGALSALSDLHAHKLRVDPVNFKLLSHCLLVTLA

Bovine                        VEHLDDLPGALSELSDLHAHKLRVDPVNFKLLSHSLLVTLA

Rabbit                        VGHLDDLPGALSTLSDLHAHKLRVDPVNFKLLSHCLLVTLA

Sheep                         VGHLDDLPGTLSDLSDLHAHKLRVDPVNFKLLSHSLLVTLA

Cat                           VAHMDDLPTAMSALSDLHAYKLRVDPVNFKFLSHCLLVTLA

Horse                         VGHLDDLPGALSNLSDLHAHKLRVDPVNFKLLSHCLLSTLA

Chicken                       ANHIDDIAGTLSKLSDLHAHKLRVDPVNFKLLGQCFLVVVA

Xenopus tropicalis            CNHLDNIAGCLSKLSDLHAYDLRVDPGNFPLLAHQILVVVA

Zebrafish                     ISKIDDLVGGLAALSELHAFKLRVDPANFKILSHNVIVVIA
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 88 – 88 proximal binding residue
Site 91 – 91 Not glycated
Site 100 – 100 Not glycated
Modified residue 103 – 103 Phosphoserine
Modified residue 109 – 109 Phosphothreonine
Turn 91 – 93



Literature citations
HB Handa [alpha 90 (FG 2) Lys replaced by Met]: structure and biosynthesis of a new slightly higher oxygen affinity variant.
Harano T.; Harano K.; Shibata S.; Ueda S.; Imai K.; Seki M.;
Hemoglobin 6:379-389(1982)
Cited for: VARIANT HANDA MET-91;
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.