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UniProtKB/Swiss-Prot Q9Y276: Variant p.Arg183Cys

Mitochondrial chaperone BCS1
Gene: BCS1L
Variant information

Variant position:  183
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  Disease [Disclaimer]
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 Arginine (R) to Cysteine (C) at position 183 (R183C, p.Arg183Cys).
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 basic (R) to medium size and polar (C)
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

Involvement in disease:  Mitochondrial complex III deficiency, nuclear 1 (MC3DN1) [MIM:124000]: A disorder of the mitochondrial respiratory chain resulting in a highly variable phenotype depending on which tissues are affected. Clinical features include mitochondrial encephalopathy, psychomotor retardation, ataxia, severe failure to thrive, liver dysfunction, renal tubulopathy, muscle weakness and exercise intolerance. {ECO:0000269|PubMed:11528392, ECO:0000269|PubMed:12910490, ECO:0000269|PubMed:17314340, ECO:0000269|PubMed:17403714, ECO:0000269|PubMed:18628306, ECO:0000269|PubMed:19162478, ECO:0000269|PubMed:22991165}. Note=The disease is caused by mutations affecting the gene represented in this entry.
The name and a short description of the disease associated with the variant. For more information about the disease, the user can refer to OMIM, following the link provided after the disease acronym.

Variant description:  In MC3DN1; causes a decreased incorporation of the Rieske iron-sulfur protein UQCRFS1 into complex III.
Any additional useful information about the variant.

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



Sequence information

Variant position:  183
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  419
The length of the canonical sequence.

Location on the sequence:   EGKTVMYTAVGSEWRPFGYP  R RRRPLNSVVLQQGLADRIVR
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                         EGKTVMYTAVGSEWRPFGYPRRRRPLNSVVLQQGLADRIVR

Mouse                         EGKTVMYTAVGSEWRTFGYPRRRRPLDSVVLQQGLADRIVK

Bovine                        EGKTVMYTAVGSEWRPFGYPRRRRPLNSVVLEQGVTERIVR

Xenopus laevis                VGKTVMYNAVGAEWRQFGFPRRRRPLSSVVLEQGISEKIVQ

Zebrafish                     EGRTVMYTAMGAEWRPFGFPRRRRPLSSVVLESGVAERIVD

Baker's yeast                 EGKTVIYTSFGPEWRKFGQPKAKRMLPSVILDSGIKEGILD

Fission yeast                 KNKTTIYTAWATEWKPFGHPRSKRMLSSVVLESNVKKMITD

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 2 – 419 Mitochondrial chaperone BCS1
Topological domain 33 – 419 Mitochondrial matrix
Modified residue 181 – 181 Phosphotyrosine


Literature citations

Impaired complex III assembly associated with BCS1L gene mutations in isolated mitochondrial encephalopathy.
Fernandez-Vizarra E.; Bugiani M.; Goffrini P.; Carrara F.; Farina L.; Procopio E.; Donati A.; Uziel G.; Ferrero I.; Zeviani M.;
Hum. Mol. Genet. 16:1241-1252(2007)
Cited for: VARIANTS MC3DN1 CYS-73; CYS-183; CYS-184 AND ILE-368;

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.