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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot Q06187: Variant p.Cys155Arg

Tyrosine-protein kinase BTK
Gene: BTK
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Variant information Variant position: help 155 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 Cysteine (C) to Arginine (R) at position 155 (C155R, p.Cys155Arg). 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 (C) to large size and basic (R) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -3 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 XLA. Any additional useful information about the variant.


Sequence information Variant position: help 155 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 659 The length of the canonical sequence.
Location on the sequence: help NSDLVQKYHPCFWIDGQYLC C SQTAKNAMGCQILENRNGSL 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                         NSDLVQKYHPCFWIDGQYLCCSQTAKNAMGCQILENRNGSL

Mouse                         NSDLVQKYHPCFWIDGQYLCCSQTAKNAMGCQILENRNGSL

Chicken                       NSDLVQKYHPCFWIDGQYLCCSQTAKNAMGCKILESRNGSL
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 2 – 659 Tyrosine-protein kinase BTK
Zinc finger 135 – 171 Btk-type
Binding site 143 – 143
Binding site 154 – 154
Binding site 155 – 155
Binding site 165 – 165
Turn 153 – 155



Literature citations
Missense mutations affecting a conserved cysteine pair in the TH domain of Btk.
Vihinen M.; Nore B.; Mattsson P.T.; Backesj C.-M.; Nars M.; Koutaniemi S.; Watanabe C.; Lester T.; Jones A.M.; Ochs H.D.; Smith C.I.E.;
FEBS Lett. 413:205-210(1997)
Cited for: VARIANTS XLA SER-154 AND ARG-155; Mutation screening of the BTK gene in 56 families with X-linked agammaglobulinemia (XLA): 47 unique mutations without correlation to clinical course.
Holinski-Feder E.; Weiss M.; Brandau O.; Jedele K.B.; Nore B.; Baeckesjoe C.-M.; Vihinen M.; Hubbard S.R.; Belohradsky B.H.; Smith C.I.E.; Meindl A.;
Pediatrics 101:276-284(1998)
Cited for: VARIANTS XLA GLU-19; HIS-28; ASN-61; PRO-117; HIS-127; ARG-155; PRO-295; PHE-369; GLY-372; ARG-414; TYR-506; GLY-521; GLN-525; SER-559; TRP-562; GLU-594; THR-619; GLY-626 AND HIS-641;
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.