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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P15559: Variant p.Gln269His

NAD(P)H dehydrogenase [quinone] 1
Gene: NQO1
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Variant information Variant position: help 269 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 Glutamine (Q) to Histidine (H) at position 269 (Q269H, p.Gln269His). 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 polar. The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help 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

Polymorphism: help The Ser-187 polymorphism may be linked to susceptibility to forms of cancers. Additional information on the polymorphism described.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 269 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 274 The length of the canonical sequence.
Location on the sequence: help NKKFGLSVGHHLGKSIPTDN Q IKARK 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                         NKKFGLSVGHHLGKSIPTDNQIKARK

Mouse                         KNKFGLSVGHHLGKSIPADNQIKARK

Rat                           KNKFGLSVGHHLGKSIPADNQIKARK

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 1 – 274 NAD(P)H dehydrogenase [quinone] 1
Region 225 – 274 Important for apoenzyme conformational stability
Cross 250 – 250 Glycyl lysine isopeptide (Lys-Gly) (interchain with G-Cter in SUMO2)
Cross 251 – 251 Glycyl lysine isopeptide (Lys-Gly) (interchain with G-Cter in SUMO2)
Turn 266 – 270



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.