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UniProtKB/Swiss-Prot Q969N2: Variant p.Thr183Pro

GPI transamidase component PIG-T
Gene: PIGT
Variant information

Variant position:  183
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 Threonine (T) to Proline (P) at position 183 (T183P, p.Thr183Pro).
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 (T) to medium size and hydrophobic (P)
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 MCAHS3; flow cytometric analysis of patient granulocytes and monocytes show decreased amounts of GPI-anchored proteins CD16B and CD59 compared to controls.
Any additional useful information about the variant.

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

Sequence information

Variant position:  183
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  578
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.

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 22 – 578 GPI transamidase component PIG-T
Topological domain 22 – 527 Lumenal
Glycosylation 164 – 164 N-linked (GlcNAc...) asparagine
Disulfide bond 182 – 182 Interchain (with C-92 in PIGK/GPI8)
Alternative sequence 63 – 256 Missing. In isoform 2.
Mutagenesis 182 – 182 C -> S. Decrease in activity.

Literature citations

A novel intellectual disability syndrome caused by GPI anchor deficiency due to homozygous mutations in PIGT.
Kvarnung M.; Nilsson D.; Lindstrand A.; Korenke G.C.; Chiang S.C.; Blennow E.; Bergmann M.; Stodberg T.; Makitie O.; Anderlid B.M.; Bryceson Y.T.; Nordenskjold M.; Nordgren A.;
J. Med. Genet. 50:521-528(2013)
Cited for: VARIANT MCAHS3 PRO-183;

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.