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UniProtKB/Swiss-Prot Q9Y276: Variant p.Pro99Leu

Mitochondrial chaperone BCS1
Gene: BCS1L
Chromosomal location: 2q33
Variant information

Variant position:  99
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 Proline (P) to Leucine (L) at position 99 (P99L, p.Pro99Leu).
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:  Similar physico-chemical property. Both residues are medium size and hydrophobic.
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.
Any additional useful information about the variant.

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



Sequence information

Variant position:  99
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:   VETSYLQHESGRISTKFEFV  P SPGNHFIWYRGKWIRVERSR
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                         VETSYL--------QHESGRISTK-FEFVPSPGNHFIWYRGKWIRVERSR

Mouse                         VETSYL--------QHESGRISTK-FEFIPSPGNHFIWYQG

Bovine                        VETTYL--------QHESGRISTK-FEFVPSPGNHFIWYQG

Xenopus laevis                VETSYL--------QHESGRISTK-FDFVPSPGNHFIWYRS

Zebrafish                     VETSYM--------QHESGKVHTQ-FDFHPSPGNHIIWYGR

Baker's yeast                 VRTNYI--------QHDNGSVSTK-FSLVPGPGNHWIRYKG

Fission yeast                 VESNRQLKMPQNAREKPDKQVANRIFSLVPGPGKHYIKYKK

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


Literature citations

A mutant mitochondrial respiratory chain assembly protein causes complex III deficiency in patients with tubulopathy, encephalopathy and liver failure.
de Lonlay P.; Valnot I.; Barrientos A.; Gorbatyuk M.; Tzagoloff A.; Taanman J.-W.; Benayoun E.; Chretien D.; Kadhom N.; Lombes A.; Ogier de Baulny H.; Niaudet P.; Munnich A.; Rustin P.; Roetig A.;
Nat. Genet. 29:57-60(2001)
Cited for: NUCLEOTIDE SEQUENCE [MRNA]; VARIANTS MC3DN1 LEU-99; PRO-155; ASN-277 AND MET-353;

Missense mutations in the BCS1L gene as a cause of the Bjoernstad syndrome.
Hinson J.T.; Fantin V.R.; Schoenberger J.; Breivik N.; Siem G.; McDonough B.; Sharma P.; Keogh I.; Godinho R.; Santos F.; Esparza A.; Nicolau Y.; Selvaag E.; Cohen B.H.; Hoppel C.L.; Tranebjaerg L.; Eavey R.D.; Seidman J.G.; Seidman C.E.;
N. Engl. J. Med. 356:809-819(2007)
Cited for: VARIANTS BJS ARG-35; TRP-114; HIS-183; CYS-184; GLU-302 AND HIS-306; VARIANTS MC3DN1 LEU-99; PRO-155; ASN-277 AND MET-353; VARIANTS GRACILE GLY-78; GLN-144 AND ALA-327;

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.