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UniProtKB/Swiss-Prot Q30201: Variant p.Glu277Lys

Hereditary hemochromatosis protein
Gene: HFE
Variant information

Variant position:  277
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 Glutamate (E) to Lysine (K) at position 277 (E277K, p.Glu277Lys).
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:  Genetic variations in HFE define the transferrin serum level quantitative trait locus 2 (TFQTL2) [MIM:614193]. Iron is essential for biochemical functions such as oxygen transport and oxidative phosphorylation. Excessive iron can cause iron-overload-related liver diseases, whereas iron deficiency can lead to anemia. Iron status can be assessed by measuring the levels of serum iron, serum transferrin, transferrin saturation with iron, and serum ferritin.
Additional information on the polymorphism described.

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

Sequence information

Variant position:  277
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  348
The length of the canonical sequence.

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.





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.

Chain 23 – 348 Hereditary hemochromatosis protein
Topological domain 23 – 306 Extracellular
Domain 207 – 298 Ig-like C1-type
Region 206 – 297 Alpha-3
Disulfide bond 225 – 282
Alternative sequence 27 – 298 Missing. In isoform 11.
Alternative sequence 162 – 348 Missing. In isoform 9.
Alternative sequence 277 – 348 Missing. In isoform 8.
Helix 276 – 279

Literature citations

Two novel polymorphisms (E277K and V212V) in the haemochromatosis gene HFE.
Bradbury R.; Fagan E.; Payne S.J.;
Hum. Mutat. 15:120-120(2000)
Cited for: VARIANT LYS-277;

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.