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UniProtKB/Swiss-Prot P40692: Variant p.Val326Ala

DNA mismatch repair protein Mlh1
Gene: MLH1
Variant information

Variant position:  326
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 Valine (V) to Alanine (A) at position 326 (V326A, p.Val326Ala).
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 medium size and hydrophobic (V) to small size and hydrophobic (A)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  0
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 HNPCC2; no decrease in mismatch repair activity.
Any additional useful information about the variant.

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



Sequence information

Variant position:  326
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  756
The length of the canonical sequence.

Location on the sequence:   NVHPTKHEVHFLHEESILER  V QQHIESKLLGSNSSRMYFTQ
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                         NVHPTKHEVHFLHEESILERVQQHIESKLLGSNSSRMYFTQ

Mouse                         NVHPTKHEVHFLHEESILQRVQQHIESKLLGSNSSRMYFTQ

Rat                           NVHPTKHEVHFLHEESILERVQQHIESKLLGSNSSRMYFTQ

Slime mold                    NIHPTKSEVKILHEEQIIEFIQQKVDQELSISSNSKTFSTQ

Baker's yeast                 NVHPTKREVRFLSQDEIIEKIANQLHAELSAIDTSRTFKAS

Fission yeast                 NVHPSKRIVHFLYDQEIATSICDKLGEILERTDTERSYPLQ

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 2 – 756 DNA mismatch repair protein Mlh1
Helix 322 – 335


Literature citations

Assessment of pathogenicity criteria for constitutional missense mutations of the hereditary nonpolyposis colorectal cancer genes MLH1 and MSH2.
Genuardi M.; Carrara S.; Anti M.; Ponz de Leon M.; Viel A.;
Eur. J. Hum. Genet. 7:778-782(1999)
Cited for: VARIANTS HIS-265; ALA-326; PRO-385; ASN-406; THR-618 AND MET-716;

Functional analysis of hMLH1 variants and HNPCC-related mutations using a human expression system.
Trojan J.; Zeuzem S.; Randolph A.; Hemmerle C.; Brieger A.; Raedle J.; Plotz G.; Jiricny J.; Marra G.;
Gastroenterology 122:211-219(2002)
Cited for: CHARACTERIZATION OF VARIANTS HNPCC2 MET-117; GLY-185; CYS-217; ASP-244 AND ALA-326; CHARACTERIZATION OF VARIANTS VAL-219 AND HIS-265;

A large fraction of unclassified variants of the mismatch repair genes MLH1 and MSH2 is associated with splicing defects.
Tournier I.; Vezain M.; Martins A.; Charbonnier F.; Baert-Desurmont S.; Olschwang S.; Wang Q.; Buisine M.P.; Soret J.; Tazi J.; Frebourg T.; Tosi M.;
Hum. Mutat. 29:1412-1424(2008)
Cited for: VARIANT HNPCC2 ILE-330 DEL; VARIANTS HIS-41; ARG-67; ARG-77; SER-98; SER-101; ASP-101; LYS-116; MET-117; ASN-126; MET-213; SER-215; SER-216; PHE-260; CYS-265; HIS-265; ASP-320; ALA-326; ILE-330 DEL; TRP-474; GLN-474; ASP-539; PRO-549; THR-551; ARG-585; ARG-603; HIS-607; PRO-619; SER-640; LEU-640; VAL-655; SER-656; ARG-666; THR-681 AND ARG-689;

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.