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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P41180: Variant p.Pro55Leu

Extracellular calcium-sensing receptor
Gene: CASR
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Variant information Variant position: help 55 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 Proline (P) to Leucine (L) at position 55 (P55L, p.Pro55Leu). 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 Similar physico-chemical property. Both residues are medium size and hydrophobic. 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 HHC1; decreased G-protein coupled receptor signaling pathway. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 55 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 1078 The length of the canonical sequence.
Location on the sequence: help GGLFPIHFGVAAKDQDLKSR P ESVECIRYNFRGFRWLQAMI 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                         GGLFPIHFGVAAKDQDLKSRPESVECIRYNFRGFRWLQAMI

Mouse                         GGLFPIHFGVAAKDQDLKSRPESVECIRYNFRGFRWLQAMI

Rat                           GGLFPIHFGVAAKDQDLKSRPESVECIRYNFRGFRWLQAMI

Pig                           GGLFPIHFGVAAKDQNLESRPESVECIRYNFRGFRWLQAMI

Bovine                        GGLFPIHFGVAVKDQDLKSRPESVECIRYNFRGFRWLQAMI
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 – 1078 Extracellular calcium-sensing receptor
Topological domain 20 – 612 Extracellular
Region 22 – 188 Ligand-binding 1 (LB1)
Mutagenesis 69 – 69 R -> E. Abolishes G-protein coupled receptor signaling pathway.



Literature citations
Clustered inactivating mutations and benign polymorphisms of the calcium receptor gene in familial benign hypocalciuric hypercalcemia suggest receptor functional domains.
Heath H. III; Odelberg S.; Jackson C.E.; Teh B.T.; Hayward N.; Larsson C.; Buist N.R.; Krapcho K.J.; Hung B.C.; Capuano I.V.; Garrett J.E.; Leppert M.F.;
J. Clin. Endocrinol. Metab. 81:1312-1317(1996)
Cited for: VARIANTS HHC1 PRO-53; LEU-55; GLN-185; GLY-215; TYR-657 AND ARG-748; VARIANTS SER-986; GLY-990 AND GLN-1011; CHARACTERIZATION OF VARIANTS HHC1 PRO-53; LEU-55 AND GLY-215; Functional characterization of calcium-sensing receptor mutations expressed in human embryonic kidney cells.
Pearce S.H.S.; Bai M.; Quinn S.J.; Kifor O.; Brown E.M.; Thakker R.V.;
J. Clin. Invest. 98:1860-1866(1996)
Cited for: VARIANTS HHC1 LEU-55; ASP-178; SER-221 AND ILE-817; VARIANTS HYPOC1 LEU-128; MET-151 AND LYS-191; VARIANT NSHPT LEU-227; CHARACTERIZATION OF VARIANTS HHC1 LEU-55; ASP-178; SER-221 AND ILE-817; FUNCTION; CHARACTERIZATION OF VARIANTS HYPOC1 LEU-128; MET-151 AND LYS-191; CHARACTERIZATION OF VARIANT NSHPT LEU-227; Calcium-sensing receptor mutations and denaturing high performance liquid chromatography.
Cole D.E.; Yun F.H.; Wong B.Y.; Shuen A.Y.; Booth R.A.; Scillitani A.; Pidasheva S.; Zhou X.; Canaff L.; Hendy G.N.;
J. Mol. Endocrinol. 42:331-339(2009)
Cited for: VARIANTS HHC1 SER-42; LEU-55; HIS-66; MET-81; MET-138; ARG-143; ARG-158; GLY-166; TRP-220; ARG-549; TYR-562; GLY-565; TYR-582; 583-ASN--SER-1078 DEL; TYR-661; HIS-680; ILE-761 DEL AND TRP-795; VARIANTS HYPOC1 LYS-118; PHE-125; ARG-129; LYS-228; LYS-604; ILE-802; SER-830; LEU-832 AND SER-832;
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.