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UniProtKB/Swiss-Prot P69905: Variant p.His21Arg

Hemoglobin subunit alpha
Gene: HBA2
Variant information

Variant position:  21
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  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:  From Histidine (H) to Arginine (R) at position 21 (H21R, p.His21Arg).
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 medium size and polar (H) to large size and basic (R)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  0
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 Hobart.
Any additional useful information about the variant.

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



Sequence information

Variant position:  21
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:   MVLSPADKTNVKAAWGKVGA  H AGEYGAEALERMFLSFPTTK
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                         MVLSPADKTNVKAAWGKVGAHAGEYGAEALERMFLSFPTTK

Gorilla                       -VLSPADKTNVKAAWGKVGAHAGDYGAEALERMFLSFPTTK

                              -VLSPADKTNIKSTWDKIGGHAGDYGGEALDRTFQSFPTTK

Rhesus macaque                MVLSPADKSNVKAAWGKVGGHAGEYGAEALERMFLSFPTTK

Chimpanzee                    MVLSPADKTNVKAAWGKVGAHAGEYGAEALERMFLSFPTTK

Mouse                         MVLSGEDKSNIKAAWGKIGGHGAEYGAEALERMFASFPTTK

Rat                           MVLSADDKTNIKNCWGKIGGHGGEYGEEALQRMFAAFPTTK

Pig                           -VLSAADKANVKAAWGKVGGQAGAHGAEALERMFLGFPTTK

Bovine                        MVLSAADKGNVKAAWGKVGGHAAEYGAEALERMFLSFPTTK

Rabbit                        MVLSPADKTNIKTAWEKIGSHGGEYGAEAVERMFLGFPTTK

Sheep                         MVLSAADKSNVKAAWGKVGGNAGAYGAEALERMFLSFPTTK

Cat                           -VLSAADKSNVKACWGKIGSHAGEYGAEALERTFCSFPTTK

Horse                         MVLSAADKTNVKAAWSKVGGHAGEYGAEALERMFLGFPTTK

Chicken                       MVLSAADKNNVKGIFTKIAGHAEEYGAETLERMFTTYPPTK

Xenopus tropicalis            MHLTADDKKHIKAIWPSVAAHGDKYGGEALHRMFMCAPKTK

Zebrafish                     MSLSDTDKAVVKAIWAKISPKADEIGAEALARMLTVYPQTK

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
Initiator methionine 1 – 1 Removed
Chain 2 – 142 Hemoglobin subunit alpha
Site 12 – 12 Not glycated
Modified residue 4 – 4 Phosphoserine
Modified residue 8 – 8 N6-succinyllysine; alternate
Modified residue 9 – 9 Phosphothreonine
Modified residue 12 – 12 N6-succinyllysine
Modified residue 17 – 17 N6-acetyllysine; alternate
Modified residue 17 – 17 N6-succinyllysine; alternate
Modified residue 25 – 25 Phosphotyrosine
Modified residue 36 – 36 Phosphoserine
Modified residue 41 – 41 N6-succinyllysine; alternate
Glycosylation 8 – 8 N-linked (Glc) (glycation) lysine; alternate
Glycosylation 17 – 17 N-linked (Glc) (glycation) lysine; alternate
Glycosylation 41 – 41 N-linked (Glc) (glycation) lysine; alternate
Helix 19 – 21


Literature citations

Hemoglobin Hobart or alpha 20(Bl)His-->Arg: a new alpha chain hemoglobin variant.
Fleming P.J.; Sumner D.R.; Wyatt K.; Hughes W.G.; Melrose W.D.; Jupe D.M.D.; Baikie M.J.;
Hemoglobin 11:211-220(1987)
Cited for: VARIANT HOBART ARG-21;

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.