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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P23415: Variant p.Tyr307Cys

Glycine receptor subunit alpha-1
Gene: GLRA1
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Variant information Variant position: help 307 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 Tyrosine (Y) to Cysteine (C) at position 307 (Y307C, p.Tyr307Cys). 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 large size and aromatic (Y) to medium size and polar (C) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -2 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 HKPX1; requires much higher glycine levels for channel activation. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 307 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 457 The length of the canonical sequence.
Location on the sequence: help TVLTMTTQSSGSRASLPKVS Y VKAIDIWMAVCLLFVFSALL 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                         TVLTMTTQSSGSRASLPKVSYVKAIDIWMAVCLLFVFSALL

Mouse                         TVLTMTTQSSGSRASLPKVSYVKAIDIWMAVCLLFVFSALL

Rat                           TVLTMTTQSSGSRASLPKVSYVKAIDIWMAVCLLFVFSALL

Bovine                        TVLTMTTQSSGSRASLPKVSYVKAIDIWMAVCLLFVFSALL

Zebrafish                     TVLTMTTQSSGSRASLPKVSYVKAIDIWMAVCLLFVFSALL
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 29 – 457 Glycine receptor subunit alpha-1
Topological domain 299 – 309 Extracellular
Site 289 – 289 Important for obstruction of the ion pore in the closed conformation
Mutagenesis 304 – 304 K -> C. Decreases channel conductance; the mutant channel requires much higher glycine concentrations for activation.



Literature citations
Mutational and haplotype analysis of the aplha1 subunit of the glycine receptor in hyperekplexia patients.
Shiang R.; Ryan S.G.; Zhu Y.-Z.; O'Connell P.; Wasmuth J.J.;
Cited for: VARIANT HKPX1 CYS-307; Mutational analysis of familial and sporadic hyperekplexia.
Shiang R.; Ryan S.G.; Zhu Y.-Z.; Fielder T.J.; Allen R.J.; Fryer A.; Yamashita S.; O'Connell P.; Wasmuth J.J.;
Ann. Neurol. 38:85-91(1995)
Cited for: VARIANT HKPX1 CYS-307; Identification of intracellular and extracellular domains mediating signal transduction in the inhibitory glycine receptor chloride channel.
Lynch J.W.; Rajendra S.; Pierce K.D.; Handford C.A.; Barry P.H.; Schofield P.R.;
EMBO J. 16:110-120(1997)
Cited for: CHARACTERIZATION OF VARIANTS HKPX1 ASN-272; LEU-299; GLN-299; GLU-304 AND CYS-307; FUNCTION; SUBCELLULAR LOCATION; BIOPHYSICOCHEMICAL PROPERTIES;
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.