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UniProtKB/Swiss-Prot P05093: Variant p.Asn177Asp

Steroid 17-alpha-hydroxylase/17,20 lyase
Gene: CYP17A1
Variant information

Variant position:  177
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 Asparagine (N) to Aspartate (D) at position 177 (N177D, p.Asn177Asp).
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 medium size and polar (N) to medium size and acidic (D)
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 AH5; 10% 17alpha-hydroxylase and 17,20-lyase activities.
Any additional useful information about the variant.



Sequence information

Variant position:  177
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  508
The length of the canonical sequence.

Location on the sequence:   LATHNGQSIDISFPVFVAVT  N VISLICFNTSYKNGDPELNV
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                         LATHNGQSIDISFPVFVAVTNVISLICFNTSYKNGDPELNV

Rhesus macaque                LATHNGQTIDISFPVFVAITNVISLICFNISYKNGDPELKI

Chimpanzee                    LATHNGQSIDISFPVFVAVTNVISLICFNTSYKNGDPELNI

Mouse                         ILTYDGESRDLSTLIFKSVINIICTICFNISFENKDPILTT

Rat                           MLAHDKESIDLSTPIFMSVTNIICAICFNISYEKNDPKLTA

Pig                           LATRNGESIDLAQPLSLAMTNIVSFICFNFSFKKGDPALQA

Bovine                        LATQHGEAIDLSEPLSLAVTNIISFICFNFSFKNEDPALKA

Goat                          LATQHGQSIDLSEPLSLAVTNIISFICFNFSFKNEDPALKA

Sheep                         LATQHGQSIDLSEPLSLAVTNIISFICFNFSFKNEDPALKA

Cat                           LAMQDGQSIDLYLPLFLAVTNIICLICFNSSFKNGDPALKI

Horse                         LATQNGQTIDLSSPLFLAVTNVICWICFNSSYMKGDPALET

Chicken                       LGAAQDMALDMAPELTRAVTNVVCSLCFNSSYRRGDPEFEA

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 1 – 508 Steroid 17-alpha-hydroxylase/17,20 lyase
Helix 168 – 184


Literature citations

17alpha-hydroxylase/17,20-lyase deficiency as a model to study enzymatic activity regulation: role of phosphorylation.
Biason-Lauber A.; Kempken B.; Werder E.; Forest M.G.; Einaudi S.; Ranke M.B.; Matsuo N.; Brunelli V.; Schoenle E.J.; Zachmann M.;
J. Clin. Endocrinol. Metab. 85:1226-1231(2000)
Cited for: VARIANTS AH5 LEU-35; PHE-53 DEL; TRP-96; ASP-177; GLU-330 DEL; CYS-417 AND HIS-496; PHOSPHORYLATION;

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.