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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P31213: Variant p.Arg227Gln

3-oxo-5-alpha-steroid 4-dehydrogenase 2
Gene: SRD5A2
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Variant information Variant position: help 227 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 Arginine (R) to Glutamine (Q) at position 227 (R227Q, p.Arg227Gln). 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 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: help 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: help In PPSH; also found in individuals with micropenis; increased affinity for testosterone; increased affinity for NADPH; decreased Vmax. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 227 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 ATWSLPALAFAFFSLCFLGL R AFHHHRFYLKMFEDYPKSRK 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                         ATWSLPALAFAFFSLCFLGLRAFHHHRFYLKMFEDYPKSRK

Mouse                         ATWSVPAFAFAFFTLCFLGMQAFYHHRFYLKMFKDYPKSRK

Rat                           ATWSVPAFAFAFFTLCFLGMQAFYHHRFYLKMFKDYPKSRK

Pig                           ATWSLPALAFAFFSLCFLGLRAFHHHRFYVKMFEDYPKSRK
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
Helix 211 – 238



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; Micropenis and the 5alpha-reductase-2 (SRD5A2) gene: mutation and V89L polymorphism analysis in 81 Japanese patients.
Sasaki G.; Ogata T.; Ishii T.; Kosaki K.; Sato S.; Homma K.; Takahashi T.; Hasegawa T.; Matsuo N.;
J. Clin. Endocrinol. Metab. 88:3431-3436(2003)
Cited for: VARIANTS MICROPENIS 26-TYR--PHE-254 DEL; ARG-34 AND GLN-227; VARIANT VAL-89; Compound heterozygous mutations in the SRD5A2 gene exon 4 in a male pseudohermaphrodite patient of Chinese origin.
Fernandez-Cancio M.; Nistal M.; Gracia R.; Molina M.A.; Tovar J.A.; Esteban C.; Carrascosa A.; Audi L.;
J. Androl. 25:412-416(2004)
Cited for: VARIANT PPSH GLN-227;
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.