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UniProtKB/Swiss-Prot P25189: Variant p.Tyr145Ser

Myelin protein P0
Gene: MPZ
Variant information

Variant position:  145
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  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:  From Tyrosine (Y) to Serine (S) at position 145 (Y145S, p.Tyr145Ser).
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:  Change from large size and aromatic (Y) to small size and polar (S)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -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

Variant description:  In CMT1B.
Any additional useful information about the variant.

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



Sequence information

Variant position:  145
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  248
The length of the canonical sequence.

Location on the sequence:   FTCDVKNPPDIVGKTSQVTL  Y VFEKVPTRYGVVLGAVIGGV
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                         FTCDVKNPPDIVGKTSQVTLYVFEKVPTRYGVVLGAVIGGV

Mouse                         FTCDVKNPPDIVGKTSQVTLYVFEKVPTRYGVVLGAVIGGI

Rat                           FTCDVKNPPDIVGKTSQVTLYVFEKVPTRYGVVLGAVIGGI

Bovine                        FTCDVKNPPDIVGKTSQVTLYVFEKVPTRYGVVLGAVIGGV

Horse                         FTCDVKNPPDIVGKTSQVTLYVFEKVPTRYGVVLGAVIGGV

Chicken                       FTCDVKNPPDIVGKSSQVTLYVLEKVPTRYGVVLGSIIGGV

Xenopus laevis                FTCDVKNPPDVVGKSSYVHLQVQEKGPARAGLILGIIIAVA

Xenopus tropicalis            FTCDVKNPPDVVGKSSYVHLQVQEKGAARAGLVLGIIIAVA

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 30 – 248 Myelin protein P0
Topological domain 30 – 153 Extracellular
Beta strand 134 – 148


Literature citations

Charcot-Marie-Tooth disease: a novel Tyr145Ser mutation in the myelin protein zero (MPZ, P0) gene causes different phenotypes in homozygous and heterozygous carriers within one family.
Leal A.; Berghoff C.; Berghoff M.; Del Valle G.; Contreras C.; Montoya O.; Hernandez E.; Barrantes R.; Schloetzer-Schrehardt U.; Neundoerfer B.; Reis A.; Rautenstrauss B.; Heuss D.;
Neurogenetics 4:191-197(2003)
Cited for: VARIANT CMT1B SER-145;

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.