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UniProtKB/Swiss-Prot P21912: Variant p.Arg46Gln

Succinate dehydrogenase [ubiquinone] iron-sulfur subunit, mitochondrial
Gene: SDHB
Variant information

Variant position:  46
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  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:  From Arginine (R) to Glutamine (Q) at position 46 (R46Q, p.Arg46Gln).
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 (Q)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  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:  In PCC and PGL4.
Any additional useful information about the variant.

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

Sequence information

Variant position:  46
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  280
The length of the canonical sequence.

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.


Mouse                         CRGAQTAAAAAP-----------RIKKFAIYRWDPDKTGDK

Rat                           CREAQTAAAAAP-----------RIKTFAIYRWDPDKAGDK

Pig                           CRGAQTAAATAP-----------RIKKFAIYRWDPDKTGDK

Bovine                        CRGAQTAAAAAP-----------RIKKFAIYRWDPDKTGDK

Chicken                       CRGAQTAAAATS-----------RIKKFSIYRWDPDKPGDK

Xenopus laevis                SRGAQTAAAPAS-------QAAARIKKFAIYRWDPDKPGDK


Zebrafish                     VRFAQTAAAPAA---------QPRIKKFQIYRWDPDTVGDK




Baker's yeast                 ATATTAAATHTP-----------RLKTFKVYRWNPDEPSAK


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.

Chain 29 – 280 Succinate dehydrogenase [ubiquinone] iron-sulfur subunit, mitochondrial
Domain 40 – 133 2Fe-2S ferredoxin-type
Modified residue 51 – 51 N6-acetyllysine
Modified residue 55 – 55 N6-acetyllysine

Literature citations

Mutations in the SDHB gene are associated with extra-adrenal and/or malignant phaeochromocytomas.
Gimenez-Roqueplo A.-P.; Favier J.; Rustin P.; Rieubland C.; Crespin M.; Nau V.; Khau Van Kien P.; Corvol P.; Plouin P.-F.; Jeunemaitre X.;
Cancer Res. 63:5615-5621(2003)
Cited for: VARIANTS PCC PRO-43; GLN-46; GLY-46 AND CYS-230;

Novel succinate dehydrogenase subunit B (SDHB) mutations in familial phaeochromocytomas and paragangliomas, but an absence of somatic SDHB mutations in sporadic phaeochromocytomas.
Benn D.E.; Croxson M.S.; Tucker K.; Bambach C.P.; Richardson A.L.; Delbridge L.; Pullan P.T.; Hammond J.; Marsh D.J.; Robinson B.G.;
Oncogene 22:1358-1364(2003)
Cited for: VARIANTS PCC GLN-46 AND HIS-65;

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 PCC GLY-46; GLN-46; ARG-53; PRO-65; SER-87; TYR-101; ARG-192; TYR-196 AND HIS-242; VARIANTS PGL4 GLN-46 AND HIS-242;

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.