UniProtKB/SwissProt variant VAR

Variant information

Variant position:

171

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 Alanine (A) to Threonine (T) at position 171 (A171T, p.Ala171Thr).

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 small size and hydrophobic (A) to medium size and polar (T)

The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:

0

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.

Variant rs13073139 [ dbSNP | Ensembl ]

Sequence information

Variant position:

171

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:

DTEVLQRLSCMAIRGDMFLV A NLGTKEPCHSSDPRCPKDGR

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                         DTEVLQRLSCMAIRGDMFLVANLGTKEPCHSSDPRCPKDGR

Mouse                         DTEVLQRLSCMAIKGGMFLVANLGTKQPCLSSDPGCPQDGR

Rat                           DTEVLQRLSCMAIKGKMFLVANLGTKQPCLGSDPGCPQDGR

Bovine                        DTEVLQRLSCMAMKGEMFLVANLGTKQPCHSSDPGCPSDGR

Drosophila                    SISASPSTPTTTLAPPTTAAAGALAGSPTSSSPSSSAASAA

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.

Type	Positions	Description
Chain	42 – 543	Biotinidase
Domain	72 – 351	CN hydrolase

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;

Double mutation (A171T and D444H) is a common cause of profound biotinidase deficiency in children ascertained by newborn screening in the United States.
Norrgard K.J.; Pomponio R.J.; Swango K.L.; Hymes J.; Reynolds T.; Buck G.A.; Wolf B.;
Hum. Mutat. 11:410-410(1998)
Cited for: VARIANTS BTD DEFICIENCY THR-171 AND HIS-444;

UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P43251: Variant p.Ala171Thr