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UniProtKB/Swiss-Prot P06276: Variant p.Ile127Met

Cholinesterase
Gene: BCHE
Variant information

Variant position:  127
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  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:  From Isoleucine (I) to Methionine (M) at position 127 (I127M, p.Ile127Met).
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:  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:  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

Variant description:  Does not affect enzyme activity.
Any additional useful information about the variant.

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



Sequence information

Variant position:  127
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  602
The length of the canonical sequence.

Location on the sequence:   SEMWNPNTDLSEDCLYLNVW  I PAPKPKNATVLIWIYGGGFQ
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: 
The multiple alignment of the region surrounding the variant against various orthologous sequences.

Human                         SEMWNPNTDLSEDCLYLNVWIPAPKPKNATVLIWIYGGGFQ

Mouse                         SEMWNPNTNLSEDCLYLNVWIPVPKPKNATVMVWIYGGGFQ

Bovine                        SEMWNPNTDLSEDCLYLNVWIPTPKPKNATVMIWIYGGSFQ

Rabbit                        SEMWNPNTDLSEDCLYLNVWIPTPKPKNATVMIWIYGGGFQ

Cat                           SEMWNPNTDLSEDCLYLNVWIPTPKPKNATVMIWIYGGGFQ

Horse                         SEMWNPNTELSEDCLYLNVWIPAPKPKNATVMIWIYGGGFQ

Sequence annotation in neighborhood:  
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 – 602 Cholinesterase
Binding site 110 – 110 Tacrine
Glycosylation 134 – 134 N-linked (GlcNAc...) (complex) asparagine
Beta strand 122 – 130


Literature citations

Four new mutations in the BCHE gene of human butyrylcholinesterase in a Brazilian blood donor sample.
Souza R.L.; Mikami L.R.; Maegawa R.O.; Chautard-Freire-Maia E.A.;
Mol. Genet. Metab. 84:349-353(2005)
Cited for: VARIANT MET-127; VARIANTS BCHED GLY-98; ARG-103 AND ASP-118;

Expression of three naturally occurring genetic variants (G75R, E90D, I99M) of the BCHE gene of human butyrylcholinesterase.
Mikami L.R.; Wieseler S.; Souza R.L.; Schopfer L.M.; Lockridge O.; Chautard-Freire-Maia E.A.;
Pharmacogenet. Genomics 17:681-685(2007)
Cited for: CHARACTERIZATION OF VARIANT MET-127; CHARACTERIZATION OF VARIANTS BCHED ARG-103 AND ASP-118;

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.