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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P31213: Variant p.Cys5Arg

3-oxo-5-alpha-steroid 4-dehydrogenase 2
Gene: SRD5A2
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Variant information Variant position: help 5 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help LB/B 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 Cysteine (C) to Arginine (R) at position 5 (C5R, p.Cys5Arg). 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 polar (C) to large size and basic (R) 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

Polymorphism: help Individuals with Thr-49 have an increased risk of prostate cancer (PubMed:10501358). The enzyme with Thr-49 has a higher in vitro V(max) than the Ala-49 enzyme (PubMed:10501358). Additional information on the polymorphism described.
Variant description: help No effect on affinity for testosterone; no effect on affinity for NADPH; no effect on Vmax. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 5 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 254 The length of the canonical sequence.
Location on the sequence: help MQVQ C QQSPVLAGSATLVALGALAL 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                         MQVQCQQSPVLAGSATLVALGALAL

Mouse                         MPIVCHQVPVLAGSATLATMGTLIL

Rat                           MQIVCHQVPVLAGSATLATMGTLIL

Pig                           MPVRCQQSPVLAGSATLAALGALAL

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 – 254 3-oxo-5-alpha-steroid 4-dehydrogenase 2



Literature citations
Biochemical and pharmacogenetic dissection of human steroid 5 alpha-reductase type II.
Makridakis N.M.; di Salle E.; Reichardt J.K.;
Pharmacogenetics 10:407-413(2000)
Cited for: VARIANTS ARG-5; LEU-30; ARG-48; THR-49; THR-51; VAL-89; MET-187; LEU-194 AND LEU-234; VARIANT PPSH GLN-227; FUNCTION; CATALYTIC ACTIVITY; BIOPHYSICOCHEMICAL PROPERTIES; CHARACTERIZATION OF VARIANTS THR-49; VAL-89; MET-187 AND LEU-234;
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.