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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot O15162: Variant p.His262Tyr

Phospholipid scramblase 1
Gene: PLSCR1
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Variant information Variant position: help 262 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help LB/B 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 Histidine (H) to Tyrosine (Y) at position 262 (H262Y, p.His262Tyr). 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 medium size and polar (H) to large size and aromatic (Y) 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

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


Sequence information Variant position: help 262 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 318 The length of the canonical sequence.
Location on the sequence: help DVDFEIKSLDEQCVVGKISK H WTGILREAFTDADNFGIQFP 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: 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 1 – 318 Phospholipid scramblase 1
Topological domain 1 – 288 Cytoplasmic
Region 99 – 290 Interaction with hepatitis C virus E2 glycoprotein
Motif 257 – 266 Nuclear localization signal
Mutagenesis 262 – 262 H -> A. 60% reduction in nuclease activity; when associated with A-12; A-53; A-111 and A-211.
Mutagenesis 262 – 262 H -> Y. Significantly impaired anti-SARS-CoV-2 activity.
Mutagenesis 273 – 273 D -> A. Reduces the Ca(2+)-dependent phospholipid scrambling.
Mutagenesis 275 – 275 D -> A. Complete inactivation of the Ca(2+)-dependent phospholipid scrambling. No effect on its nuclease activity.
Mutagenesis 277 – 277 F -> A. Reduces the Ca(2+)-dependent phospholipid scrambling.
Mutagenesis 279 – 279 I -> A. Reduces the Ca(2+)-dependent phospholipid scrambling.
Mutagenesis 281 – 281 F -> A. Complete inactivation of the Ca(2+)-dependent phospholipid scrambling.



Literature citations
No reference for the current variant in UniProtKB/Swiss-Prot.
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.