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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot Q9UBS5: Variant p.Ala397Val

Gamma-aminobutyric acid type B receptor subunit 1
Gene: GABBR1
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Variant information Variant position: help 397 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help 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: help From Alanine (A) to Valine (V) at position 397 (A397V, p.Ala397Val). 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: help Change from small size and hydrophobic (A) to medium size and hydrophobic (V) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help 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: help In NEDLC; likely pathogenic; results in decreased G protein-coupled GABA receptor activity; does not affect surface expression of the receptor. Any additional useful information about the variant.


Sequence information Variant position: help 397 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 961 The length of the canonical sequence.
Location on the sequence: help EVYKERLFGKKYVWFLIGWY A DNWFKIYDPSINCTVDEMTE 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: help The multiple alignment of the region surrounding the variant against various orthologous sequences. 
Human                         EVYKERLFGKKYVWFLIGWYADNWF-KIYDPSINCTVDEMTE

Mouse                         EVYKERLFGKKYVWFLIGWYADNWF-KTYDPSINCTVEEMT

Rat                           EVYKERLFGKKYVWFLIGWYADNWF-KTYDPSINCTVEEMT

Caenorhabditis elegans        QAYHHGLYGRRYVWFFIGWYADTWYIPPPEEHLNCTAEQMT
Sequence annotation in neighborhood: help 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 20 – 961 Gamma-aminobutyric acid type B receptor subunit 1
Topological domain 20 – 591 Extracellular
Glycosylation 409 – 409 N-linked (GlcNAc...) asparagine
Disulfide bond 376 – 410
Mutagenesis 395 – 395 W -> A. Strongly reduces signaling via G-proteins. Strongly reduces antagonist binding.



Literature citations
GABBR1 monoallelic de novo variants linked to neurodevelopmental delay and epilepsy.
Cediel M.L.; Stawarski M.; Blanc X.; Noskova L.; Magner M.; Platzer K.; Gburek-Augustat J.; Baldridge D.; Constantino J.N.; Ranza E.; Bettler B.; Antonarakis S.E.;
Am. J. Hum. Genet. 109:1885-1893(2022)
Cited for: INVOLVEMENT IN NEDLC; VARIANTS NEDLC ASP-368; VAL-397; THR-535 AND ASP-673; CHARACTERIZATION OF VARIANTS NEDLC ASP-368; VAL-397; THR-535 AND ASP-673; FUNCTION;
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.