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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P06727: Variant p.Arg264Gln

Apolipoprotein A-IV
Gene: APOA4
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Variant information Variant position: help 264 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 Arginine (R) to Glutamine (Q) at position 264 (R264Q, p.Arg264Gln). 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 (R) to medium size and polar (Q) 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

Polymorphism: help Eight alleles have been characterized (APOA-IV*0 to APOA-IV*7). APOA-IV*1 is the major allele (90%), APOA-IV*2 is also common (8%), the others are rare alleles. Additional information on the polymorphism described.
Variant description: help In Seattle-2; may contribute to the development of familial combined hyperlipidemia. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 264 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 396 The length of the canonical sequence.
Location on the sequence: help QMKKNAEELKARISASAEEL R QRLAPLAEDVRGNLRGNTEG 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                         QMKKNAEELKARISASAEELRQRLAPLAEDVRGNLRGNTEG

                              QMKKNAEELKAKISANAEELRQRLAPVAEDVRGKLKDNTAG

Mouse                         QMKKNAEELQTKVSAKIDQLQKNLAPLVEDVQSKVKGNTEG

Rat                           QMKKNAEELQTKVSTNIDQLQKNLAPLVEDVQSKLKGNTEG

Pig                           QMKKQAEELKAKISANADELRQKLVPVAENVHGHLKGNTEG

Bovine                        QMKKHAEELKAKISAKAEELRQGLVPLVNSVHGSQLGNAED

Cat                           QMKKNAEELKAKITANADELRQRLAPVAEDVRSKLRDNAKG

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 21 – 396 Apolipoprotein A-IV
Repeat 247 – 268 10
Region 33 – 330 13 X 22 AA approximate tandem repeats
Helix 231 – 276



Literature citations
Two novel apolipoprotein A-IV variants in individuals with familial combined hyperlipidemia and diminished levels of lipoprotein lipase activity.
Deeb S.S.; Nevin D.N.; Iwasaki L.; Brunzell J.D.;
Hum. Mutat. 8:319-325(1996)
Cited for: VARIANT SEATTLE-3 SER-161; VARIANT SEATTLE-1 LEU-178; VARIANT SEATTLE-2 GLN-264;
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.