UniProtKB/Swiss-Prot P21912: Variant p.Ala43Pro

Succinate dehydrogenase [ubiquinone] iron-sulfur subunit, mitochondrial
Gene: SDHB
Chromosomal location: 1p35.2
Variant information

Variant position:  43
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 have been found in patients and disease-association is reported in literature. However, this classification is not a definitive assessment of variant pathogenicity.
  • Polymorphism: No disease-association has been reported.
  • Unclassified: Variants have been found in patients but disease-association remains unclear.

Residue change:  From Alanine (A) to Proline (P) at position 43 (A43P, p.Ala43Pro).
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 small size and hydrophobic (A) to medium size and hydrophobic (P)
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

Involvement in disease:  Pheochromocytoma (PCC) [MIM:171300]: A catecholamine-producing tumor of chromaffin tissue of the adrenal medulla or sympathetic paraganglia. The cardinal symptom, reflecting the increased secretion of epinephrine and norepinephrine, is hypertension, which may be persistent or intermittent. Note=Disease susceptibility is associated with variations 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 pheochromocytoma.
Any additional useful information about the variant.



Sequence information

Variant position:  43
The position of the amino-acid change on the UniProtKB canonical protein sequence.

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

Location on the sequence:   LQASRGAQTAAATAPRIKKF  A IYRWDPDKAGDKPHMQTYEV
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                         LQASRGAQTAAATAP-----------RIKKFAIYRWDPDKAGDKPHMQTYEV

Mouse                         FQACRGAQTAAAAAP-----------RIKKFAIYRWDPDKT

Rat                           FQACREAQTAAAAAP-----------RIKTFAIYRWDPDKA

Pig                           LQACRGAQTAAATAP-----------RIKKFAIYRWDPDKT

Bovine                        LQACRGAQTAAAAAP-----------RIKKFAIYRWDPDKT

Chicken                       HGICRGAQTAAAATS-----------RIKKFSIYRWDPDKP

Xenopus laevis                LQVSRGAQTAAAPAS-------QAAARIKKFAIYRWDPDKP

Xenopus tropicalis            LQVCRGAQTAAAAAP-----ASQAEARIKKFAIYRWDPDKP

Zebrafish                     VTAVRFAQTAAAPAA---------QPRIKKFQIYRWDPDTV

Caenorhabditis elegans        PATAAAAEASFPSTDDVAAKTKKTGNRIKTFEIYRFNPEAP

Drosophila                    AISNGTAQLEQQAQP-----KEAQEPQIKKFEIYRWNPDNA

Slime mold                    AFYTTTAKTEASSSPQMKIKTAEKKDHFVNFQVYRYN-EET

Baker's yeast                 KGMATATTAAATHTP-----------RLKTFKVYRWNPDEP

Fission yeast                 RMMATEANISATSAN-----PQSQGENLKTFEIYRWNPEKP

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 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 PHEOCHROMOCYTOMA PRO-43; GLN-46; GLY-46 AND CYS-230;

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.