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UniProtKB/Swiss-Prot P43251: Variant p.Asp228Tyr

Biotinidase
Gene: BTD
Variant information

Variant position:  228
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 Aspartate (D) to Tyrosine (Y) at position 228 (D228Y, p.Asp228Tyr).
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 acidic (D) to large size and aromatic (Y)
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

Variant description:  In BTD deficiency.
Any additional useful information about the variant.

Other resources:  
Links to websites of interest for the variant.



Sequence information

Variant position:  228
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  543
The length of the canonical sequence.

Location on the sequence:   DRYRKHNLYFEAAFDVPLKV  D LITFDTPFAGRFGIFTCFDI
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                         DRYRKHNLYFEAAFDVPLKVDLITFDTPFAGR-FGIFTCFDI

Mouse                         DRYRKHNLYFEAAFDTPANVDLITFDTPFAGK-FGVFTCFD

Rat                           GRYRKHNLYFEEAFDSPADVDLTTFDTPFAGK-FGMFTCFD

Bovine                        DRYRKHNLYFEAAFDTPLEVDHTVFDTPFAGK-FGVFTCFD

Drosophila                    SAAYGWNTAYSGLGPARSQFPYAQYASDYYGNAVGMSSS--

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 42 – 543 Biotinidase
Domain 72 – 351 CN hydrolase
Active site 212 – 212 Proton donor
Active site 245 – 245 Nucleophile


Literature citations

Partial biotinidase deficiency is usually due to the D444H mutation in the biotinidase gene.
Swango K.L.; Demirkol M.; Huener G.; Pronicka E.; Sykut-Cegielska J.; Schulze A.; Mayatepek E.; Wolf B.;
Hum. Genet. 102:571-575(1998)
Cited for: VARIANTS BTD DEFICIENCY VAL-128; THR-171; TYR-228; ARG-323; HIS-444; ASP-451; HIS-456; MET-532 AND CYS-538;

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.