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UniProtKB/Swiss-Prot P16435: Variant p.Tyr178Asp

NADPH--cytochrome P450 reductase
Gene: POR
Variant information

Variant position:  178
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 implicated in disease according to literature reports.
  • Polymorphism: Variants not reported to be implicated in disease.
  • Unclassified: Variants with uncertain implication in disease according to literature reports. Evidence against or in favor of a pathogenic role is limited and/or conflicting.

Residue change:  From Tyrosine (Y) to Aspartate (D) at position 178 (Y178D, p.Tyr178Asp).
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 aromatic (Y) to medium size and acidic (D)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -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

Involvement in disease:  Disordered steroidogenesis due to cytochrome P450 oxidoreductase deficiency (DISPORD) [MIM:613571]: A disorder resulting in a rare variant of congenital adrenal hyperplasia, with apparent combined P450C17 and P450C21 deficiency and accumulation of steroid metabolites. Affected girls are born with ambiguous genitalia, but their circulating androgens are low and virilization does not progress. Conversely, affected boys are sometimes born undermasculinized. Boys and girls can present with bone malformations, in some cases resembling the pattern seen in patients with Antley-Bixler syndrome. {ECO:0000269|PubMed:14758361, ECO:0000269|PubMed:15220035}. Note=The disease is caused by mutations 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 DISPORD; complete loss of activity.
Any additional useful information about the variant.

Sequence information

Variant position:  178
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  677
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.

Human                         ETD--VDLS-----------GVKFAVFGLGNKTYEHFNAMGKYVDKRLEQLGAQ

Mouse                         ETD--VDLT-----------GVKFAVFGLGNKTYEHFNAMG

Rat                           ETD--VDLT-----------GVKFAVFGLGNKTYEHFNAMG

Pig                           EAD--VDLT-----------GVKYAVFGLGNKTYEHFNAMG

Bovine                        ETD--VDLS-----------GVKYAVFALGNKTYEHFNAMG

Rabbit                        ETD--VDLS-----------GVKYAVFGLGNKTYEHFNAMG

Drosophila                    SGD--VDLS-----------GLNYAVFGLGNKTYEHYNKVA

Slime mold                    NDERPTDLLN----------GVPFTVFGLGNKTYEHYNAVA

Baker's yeast                 NAE--AGALS----------NLRYNMFGLGNSTYEFFNGAA


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 2 – 677 NADPH--cytochrome P450 reductase
Topological domain 43 – 677 Cytoplasmic
Domain 80 – 224 Flavodoxin-like
Nucleotide binding 173 – 182 FMN
Beta strand 178 – 180

Literature citations

Congenital adrenal hyperplasia caused by mutant P450 oxidoreductase and human androgen synthesis: analytical study.
Arlt W.; Walker E.A.; Draper N.; Ivison H.E.; Ride J.P.; Hammer F.; Chalder S.M.; Borucka-Mankiewicz M.; Hauffa B.P.; Malunowicz E.M.; Stewart P.M.; Shackleton C.H.L.;
Lancet 363:2128-2135(2004)

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.