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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot O14521: Variant p.Pro81Leu

Succinate dehydrogenase [ubiquinone] cytochrome b small subunit, mitochondrial
Gene: SDHD
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Variant information Variant position: help 81 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 Proline (P) to Leucine (L) at position 81 (P81L, p.Pro81Leu). 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 81 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 AASLHWTSERVVSVLLLGLL P AAYLNPCSAMDYSLAAALTL 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                         AASLHWTSERVVSVLLLG--LLPAAYLNPCS---AMDYSLAAALTL

Mouse                         AASLHWTSERVVSVLLLG--LIPAGYLNPCS---VVDYSLA

Rat                           AASLHWTSERVVSVLLLG--LIPAGYLNPCS---VVDYSLA

Pig                           AASLHWTGERVVSVLLLG--LLPAAYLNPCS---AMDYSLA

Bovine                        AASLHWTGERVVSVLLLG--LIPAAYLNPCS---AMDYSLA

Sheep                         AASLHWTGERVVSVLLLG--LIPAAYLNPCS---AMDYSLA

Chicken                       AASLHWTSERAVSALLLG--LLPAAYLYPGP---AVDYSLA

Xenopus tropicalis            AASMHWTSERALSVALLG--LLPAAYLYPGA---AMDYSLA

Caenorhabditis elegans        --SMHFKLERLWAVGMLP--ILPASYFIHGP---VMDAVLT

Drosophila                    SHTLLWTVERIVSAGLLA--VIPAAFIAPSQ---VLDALMA

Baker's yeast                 G-SYHWYMEKIFALSVVP--LATTAMLTTGPLSTAADSFFS

Fission yeast                 G-SYHWDFERIIAIAMVPQVMIPLFTGTSHP---LMDAALA
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 64 – 85 Helical
Alternative sequence 56 – 158 HSGSKAASLHWTSERVVSVLLLGLLPAAYLNPCSAMDYSLAAALTLHGHWGLGQVVTDYVHGDALQKAAKAGLLALSALTFAGLCYFNYHDVGICKAVAMLWK -> HWALDKLLLTMFMGMPCRKLPRQGFWHFQ. In isoform 3.
Helix 81 – 85



Literature citations
Somatic and occult germ-line mutations in SDHD, a mitochondrial complex II gene, in nonfamilial pheochromocytoma.
Gimm O.; Armanios M.; Dziema H.; Neumann H.P.H.; Eng C.;
Cancer Res. 60:6822-6825(2000)
Cited for: VARIANT PPGL1 LEU-81; Mutations in SDHD, a mitochondrial complex II gene, in hereditary paraganglioma.
Baysal B.E.; Ferrell R.E.; Willett-Brozick J.E.; Lawrence E.C.; Myssiorek D.; Bosch A.; van der Mey A.; Taschner P.E.M.; Rubinstein W.S.; Myers E.N.; Richard C.W. III; Cornelisse C.J.; Devilee P.; Devlin B.;
Science 287:848-851(2000)
Cited for: VARIANTS PPGL1 LEU-81; TYR-92 AND LEU-102; Distinct clinical features of paraganglioma syndromes associated with SDHB and SDHD gene mutations.
Neumann H.P.H.; Pawlu C.; Peczkowska M.; Bausch B.; McWhinney S.R.; Muresan M.; Buchta M.; Franke G.; Klisch J.; Bley T.A.; Hoegerle S.; Boedeker C.C.; Opocher G.; Schipper J.; Januszewicz A.; Eng C.;
JAMA 292:943-951(2004)
Cited for: VARIANTS PPGL1 LEU-81; TYR-92; CYS-114 AND VAL-148;
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.