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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P00156: Variant p.Asp171Asn

Cytochrome b
Gene: MT-CYB
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Variant information Variant position: help 171 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help US 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: help From Aspartate (D) to Asparagine (N) at position 171 (D171N, p.Asp171Asn). 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: help Change from medium size and acidic (D) to medium size and polar (N) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help 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

Variant description: help In LHON; uncertain significance; secondary mutation. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 171 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 380 The length of the canonical sequence.
Location on the sequence: help SAIPYIGTDLVQWIWGGYSV D SPTLTRFFTFHFILPFIIAA 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: help The multiple alignment of the region surrounding the variant against various orthologous sequences.
Human                         SAIPYIGTDLVQWIWGGYSVDSPTLTRFFTFHFILPFIIAA

Gorilla                       SAIPYIGTDLVQWVWGGYSVDSPTLTRFFTFHFILPFIITA

                              SAIPYIGTDLVEWIWGGFSVDKATLTRFFAFHFILPFIIAA

Rhesus macaque                SAIPYIGTNLVQWIWGGYAIDSPTLTRFFTLHFILPFIIIA

Chimpanzee                    SAIPYIGTDLVQWVWGGYSVDSPTLTRFFTFHFILPFIITA

Mouse                         SAIPYIGTTLVEWIWGGFSVDKATLTRFFAFHFILPFIIAA

Rat                           SAIPYIGTTLVEWIWGGFSVDKATLTRFFAFHFILPFIIAA

Pig                           SAIPYIGTDLVEWIWGGFSVDKATLTRFFAFHFILPFIITA

Bovine                        SAIPYIGTNLVEWIWGGFSVDKATLTRFFAFHFILPFIIMA

Rabbit                        SAIPYIGTTLVEWIWGGFSVDKATLTRFFAFHFILPFIIAT

Goat                          SAIPYIGTNLVEWIWGGFSVDKATLTRFFAFHFILPFIITA

Sheep                         SAIPYIGTNLVEWIWGGFSVDKATLTRFFAFHFIFPFIIAA

Cat                           SAIPYIGTELVEWIWGGFSVDKATLTRFFGFHFILPFIISA

Horse                         SAIPYIGTTLVEWIWGGFSVDKATLTRFFAFHFILPFIITA

Chicken                       SAIPYIGHTLVEWAWGGFSVDNPTLTRFFALHFLLPFAIAG

Xenopus laevis                SAIPYIGNVLVQWIWGGFSVDNATLTRFFAFHFLLPFIIAG

Zebrafish                     SAVPYVGDTLVQWIWGGFSVDNATLTRFFAFHFLLPFIIIA

Caenorhabditis elegans        SVIPIWGPTIVTWIWSGFGVTGATLKFFFVLHFLLPWAILV

Drosophila                    SAIPYLGMDLVQWLWGGFAVDNATLTRFFTFHFILPFIVLA

Slime mold                    TVLPVIGEDIVIWLWGGFNVDNPTLNRFFSLHYLCPFIIVG

Baker's yeast                 SAIPFVGNDIVSWLWGGFSVSNPTIQRFFALHYLVPFIIAA

Fission yeast                 SAVPFIGDDLVHLLWGGFSVSNPTLNRFFSLHYLMPFVIAA

Sequence annotation in neighborhood: help 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 1 – 380 Cytochrome b
Binding site 182 – 182 axial binding residue



Literature citations
Mitochondrial DNA complex I and III mutations associated with Leber's hereditary optic neuropathy.
Brown M.D.; Voljavec A.S.; Lott M.T.; Torroni A.; Yang C.C.; Wallace D.C.;
Genetics 130:163-173(1992)
Cited for: VARIANTS LHON ASN-171 AND MET-356;
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.