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UniProtKB/Swiss-Prot P06727: Variant p.Glu250Lys

Apolipoprotein A-IV
Gene: APOA4
Variant information

Variant position:  250
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 implicated in disease according to literature reports.
  • Polymorphism: Variants not reported to be implicated in disease.
  • Unclassified: Variants with uncertain implication in disease according to literature reports. Evidence against or in favor of a pathogenic role is limited and/or conflicting.

Residue change:  From Glutamate (E) to Lysine (K) at position 250 (E250K, p.Glu250Lys).
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 acidic (E) to large size and basic (K)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  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:  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. The sequence shown represents allele APOA-IV*1.
Additional information on the polymorphism described.

Variant description:  In allele APOA-IV*3A.
Any additional useful information about the variant.

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



Sequence information

Variant position:  250
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  396
The length of the canonical sequence.

Location on the sequence:   TQEKLNHQLEGLTFQMKKNA  E ELKARISASAEELRQRLAPL
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                         TQEKLNHQLEGLTFQMKKNAEELKARISASAEELRQRLAPL

                              VQEKLNHQLEGLAFQMKKNAEELKAKISANAEELRQRLAPV

Mouse                         VQEKLNHQMEGLAFQMKKNAEELQTKVSAKIDQLQKNLAPL

Rat                           VQEKLNHQMEGLAFQMKKNAEELQTKVSTNIDQLQKNLAPL

Pig                           VQEKLNHQLEGLAFQMKKQAEELKAKISANADELRQKLVPV

Bovine                        VQGKLNHQLEGLAFQMKKHAEELKAKISAKAEELRQGLVPL

Cat                           VQEKLNHQLEGLAFQMKKNAEELKAKITANADELRQRLAPV

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


Literature citations

Human plasma apolipoproteins A-IV-0 and A-IV-3. Molecular basis for two rare variants of apolipoprotein A-IV-1.
Lohse P.; Kindt M.R.; Rader D.J.; Brewer H.B. Jr.;
J. Biol. Chem. 265:12734-12739(1990)
Cited for: POLYMORPHISM; ALLELES A-IV*0 AND A-IV*3; VARIANTS LYS-250 AND GLU-GLN-GLN-GLN-381 INS;

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.