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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot O14521: Variant p.Leu139Pro

Succinate dehydrogenase [ubiquinone] cytochrome b small subunit, mitochondrial
Gene: SDHD
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Variant information Variant position: help 139 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help 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: help From Leucine (L) to Proline (P) at position 139 (L139P, p.Leu139Pro). 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 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: help -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: help In PPGL1. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 139 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 159 The length of the canonical sequence.
Location on the sequence: help ALQKAAKAGLLALSALTFAG L CYFNYHDVGICKAVAMLWKL 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                         ALQKAAKAGLLAL---SALTFAGLCYFNYHDVGICKAVAMLWKL-------------

Mouse                         TLPKAARAGLLAL---SALTFAGLCYFNYHDVGICRAVAML

Rat                           ALQKATKAGLLAV---SALTFAGLCYFNYHDVGICRAVAML

Pig                           ALQKVAKAGLLAL---SAFTFAGLCYFNYHDVGICKAVAML

Bovine                        AVQKAAKTGLLVL---SAFTFAGLCYFNYHDVGICKAVAML

Sheep                         AVQKAAKTGLLVL---SAFTFAGLCYFNYHDVGICKAVAML

Chicken                       TPIKVANTGLYVL---SAITFTGLCYFNYYDVGICKAVAML

Xenopus tropicalis            AKIKMANTSLFAL---SALTFAGLCYFNYHDVGICKAVSML

Caenorhabditis elegans        AAAKAAHVGVYLI---TGLLLGALLHFNTNDVGITKAFELV

Drosophila                    VLPKVAHIALIII---SVATLGGLFYFIQNDVGLANGIKRF

Baker's yeast                 VYGVWHKYAMYMLGLGSAVSLFGIYKLETENDGVVGLVKSL

Fission yeast                 RFKKLSPLMHWILRGCTVLTLIGVYEFNTNDIGLTEGIKKL
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 57 – 159 Succinate dehydrogenase [ubiquinone] cytochrome b small subunit, mitochondrial
Transmembrane 121 – 142 Helical
Alternative sequence 56 – 158 HSGSKAASLHWTSERVVSVLLLGLLPAAYLNPCSAMDYSLAAALTLHGHWGLGQVVTDYVHGDALQKAAKAGLLALSALTFAGLCYFNYHDVGICKAVAMLWK -> HWALDKLLLTMFMGMPCRKLPRQGFWHFQ. In isoform 3.
Alternative sequence 106 – 143 GLGQVVTDYVHGDALQKAAKAGLLALSALTFAGLCYFN -> LECNGAILARHDLGSARSQLTATSAFRVQAILLPQPPK. In isoform 4.



Literature citations
Nearly all hereditary paragangliomas in the Netherlands are caused by two founder mutations in the SDHD gene.
Taschner P.E.M.; Jansen J.C.; Baysal B.E.; Bosch A.; Rosenberg E.H.; Broecker-Vriends A.H.J.T.; van Der Mey A.G.L.; van Ommen G.-J.B.; Cornelisse C.J.; Devilee P.;
Genes Chromosomes Cancer 31:274-281(2001)
Cited for: VARIANTS PPGL1 TYR-92 AND PRO-139;
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.