UniProtKB/Swiss-Prot P13498: Variant p.Tyr72His

Cytochrome b-245 light chain
Gene: CYBA
Chromosomal location: 16q24
Variant information

Variant position:  72
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 have been found in patients and disease-association is reported in literature. However, this classification is not a definitive assessment of variant pathogenicity.
  • Polymorphism: No disease-association has been reported.
  • Unclassified: Variants have been found in patients but disease-association remains unclear.

Residue change:  From Tyrosine (Y) to Histidine (H) at position 72 (Y72H, p.Tyr72His).
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 large size and aromatic (Y) to medium size and polar (H)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  2
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

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



Sequence information

Variant position:  72
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  195
The length of the canonical sequence.

Location on the sequence:   LEYPRGKRKKGSTMERWGQK  Y MTAVVKLFGPFTRNYYVRAV
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                         LEYPRGKRKKGSTMERWGQKYMTAVVKLFGPFT---RNYYVRAV

Mouse                         LEYPRGKRKKGSTMERCGQKYLTSVVKLFGPLT---RNYYV

Rat                           LEYPRGKRKKGSTMERCGQKYLTAVVKLFGPLT---RNYYV

Pig                           LEYPRGRRTKGSTMERCEQKYMTKVVKAFGPLS---RNYYI

Bovine                        LEYPRGKRSKGSTMERCGQKYLTRVVKLFGPLT---RNYYI

Rabbit                        LEYPRGSRAKGSTLERCGQRYLTAVLKLLGPLS---RNYYF

Slime mold                    LLYP---------------------LSFLGPLKAIFHQYYV

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 – 195 Cytochrome b-245 light chain


Literature citations

Primary structure and unique expression of the 22-kilodalton light chain of human neutrophil cytochrome b.
Parkos C.A.; Dinauer M.C.; Walker L.E.; Allen R.A.; Jesaitis A.J.; Orkin S.H.;
Proc. Natl. Acad. Sci. U.S.A. 85:3319-3323(1988)
Cited for: NUCLEOTIDE SEQUENCE [MRNA]; PROTEIN SEQUENCE OF 2-26; VARIANTS HIS-72 AND ALA-174;

Characterization of two monoclonal antibodies against cytochrome b558 of human neutrophils.
Verhoeven A.J.; Bolscher B.G.; Meerhof L.J.; van Zwieten R.; Keijer J.; Weening R.S.; Roos D.;
Blood 73:1686-1694(1989)
Cited for: NUCLEOTIDE SEQUENCE [MRNA] OF 51-195; VARIANTS HIS-72 AND ALA-174;

Three common polymorphisms in the CYBA gene form a haplotype associated with decreased ROS generation.
Bedard K.; Attar H.; Bonnefont J.; Jaquet V.; Borel C.; Plastre O.; Stasia M.-J.; Antonarakis S.E.; Krause K.-H.;
Hum. Mutat. 30:1123-1133(2009)
Cited for: VARIANTS HIS-72; GLY-171; ALA-174 AND ASP-193;

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.