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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot O95944: Variant p.Ser139Pro

Natural cytotoxicity triggering receptor 2
Gene: NCR2
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Variant information Variant position: help 139 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 Serine (S) to Proline (P) at position 139 (S139P, p.Ser139Pro). 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 polar (S) to medium size and hydrophobic (P) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -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

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


Sequence information Variant position: help 139 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 276 The length of the canonical sequence.
Location on the sequence: help VSKSVRFYLVVSPASASTQT S WTPRDLVSSQTQTQSCVPPT 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 22 – 276 Natural cytotoxicity triggering receptor 2
Topological domain 22 – 192 Extracellular
Region 138 – 184 Disordered



Literature citations
NKp44, a triggering receptor involved in tumor cell lysis by activated human natural killer cells, is a novel member of the immunoglobulin superfamily.
Cantoni C.; Bottino C.; Vitale M.; Pessino A.; Augugliaro R.; Malaspina A.; Parolini S.; Moretta L.; Moretta A.; Biassoni R.;
J. Exp. Med. 189:787-796(1999)
Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM 1); TISSUE SPECIFICITY; DISULFIDE BONDS; FUNCTION; INTERACTION WITH TYROBP; VARIANTS PRO-139 AND VAL-223; NKp44 related genes.
Cantoni C.; Biassoni R.;
Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORMS 2 AND 3); VARIANT PRO-139;
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.