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UniProtKB/Swiss-Prot Q16595: Variant p.Trp155Arg

Frataxin, mitochondrial
Gene: FXN
Variant information

Variant position:  155
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  LP/P [Disclaimer]
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 Tryptophan (W) to Arginine (R) at position 155 (W155R, p.Trp155Arg).
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 (W) to large size and basic (R)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -3
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

Variant description:  In FRDA; reduces interaction with LYRM4; the interaction is rescued by nickel.
Any additional useful information about the variant.

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



Sequence information

Variant position:  155
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  210
The length of the canonical sequence.

Location on the sequence:   KLGGDLGTYVINKQTPNKQI  W LSSPSSGPKRYDWTGKNWVY
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                         KLGGDLGTYVINKQTPNKQIWLSSPSSGPKRYDW----TGKNWVY

Mouse                         KLGGDLGTYVINKQTPNKQIWLSSPSSGPKRYDW----TGK

Rat                           KLGGDLGTYVINKQTPLLYLWFSGPCSGPKRYDW----TGK

Bovine                        KLGGDLGTYVINKQTPNKQIWLSSPSSGPKRYDW----TGR

Caenorhabditis elegans        NVSKSVGTYVINKQSPNKQIWLSSPMSGPKRYDL---EEEG

Drosophila                    NLGGQHGTYVINRQTPNKQIWLSSPTSGPKRYDFVGTVAAG

Slime mold                    IVGNK-GTYVINKQTPNRQIWWSSPLSGPKRFDY--DSVEK

Baker's yeast                 EIPAF-GTYVINKQPPNKQIWLASPLSGPNRFDL----LNG

Fission yeast                 MLGEK-GTYVINKQPPAHQIWLSSPVSGPKHYEY--SLKSK

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 42 – 210 Frataxin intermediate form
Chain 56 – 210 Frataxin(56-210)
Chain 78 – 210 Frataxin(78-210)
Chain 81 – 210 Frataxin mature form
Beta strand 153 – 157


Literature citations

Mitochondrial frataxin interacts with ISD11 of the NFS1/ISCU complex and multiple mitochondrial chaperones.
Shan Y.; Napoli E.; Cortopassi G.;
Hum. Mol. Genet. 16:929-941(2007)
Cited for: INTERACTION WITH LYRM4 AND HSPA9; CHARACTERIZATION OF VARIANTS PHE-154 AND ARG-155;

A missense mutation (W155R) in an American patient with Friedreich's ataxia.
Labuda M.; Poirier J.; Pandolfo M.;
Cited for: VARIANT FRDA ARG-155;

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.