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UniProtKB/Swiss-Prot P40925: Variant p.Ala120Val

Malate dehydrogenase, cytoplasmic
Gene: MDH1
Variant information

Variant position:  120
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 Alanine (A) to Valine (V) at position 120 (A120V, p.Ala120Val).
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 small size and hydrophobic (A) to medium size and hydrophobic (V)
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 DEE88; decreased protein expression; increased levels of glutamate and glycerol-3-phosphate.
Any additional useful information about the variant.



Sequence information

Variant position:  120
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  334
The length of the canonical sequence.

Location on the sequence:   DLLKANVKIFKSQGAALDKY  A KKSVKVIVVGNPANTNCLTA
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                         DLLKANVKIFKSQGAALDKYAK-KSVKVIVVGNPANTNC-LTA

Mouse                         DLLKANVKIFKSQGTALEKYAK-KSVKVIVVGNPANTNC-L

Rat                           DLLKANVKIFKSQGAALEKYAK-KSVKVIVVGNPANTNC-L

Pig                           DLLKANVKIFKCQGAALDKYAK-KSVKVIVVGNPANTNC-L

Bovine                        DLLKANVKIFKCQGAALDKYAK-KSVKVIVVGNPANTNC-L

Cat                           DLLKANVKIFKCQGAALEKYAK-KSVKVIVVGNPANTNC-L

Chicken                       DLLKANVKIFKSQGAALDKYAK-KTVKVVVVGNPANTNC-L

Xenopus laevis                DLLKANVKIFKSQGAALNKYSK-KSVKVIVVGNPANTNC-L

Xenopus tropicalis            DLLKANVKIFKSQGAALNKYSK-KSVKVIVVGNPANTNC-L

Slime mold                    DLLKANAAIFKVQGKALAEHAN-KNVKVLVVGNPANTNA-L

Baker's yeast                 DLFNVNAGIISQLGDSIAECCDLSKVFVLVISNPVNSLVPV

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 – 334 Malate dehydrogenase, cytoplasmic
Binding site 105 – 105 NAD
Binding site 112 – 112 NAD
Binding site 131 – 131 Substrate
Modified residue 110 – 110 N6-succinyllysine
Modified residue 118 – 118 N6-acetyllysine
Modified residue 121 – 121 N6-acetyllysine


Literature citations

MDH1 deficiency is a metabolic disorder of the malate-aspartate shuttle associated with early onset severe encephalopathy.
Broeks M.H.; Shamseldin H.E.; Alhashem A.; Hashem M.; Abdulwahab F.; Alshedi T.; Alobaid I.; Zwartkruis F.; Westland D.; Fuchs S.; Verhoeven-Duif N.M.; Jans J.J.M.; Alkuraya F.S.;
Hum. Genet. 138:1247-1257(2019)
Cited for: INVOLVEMENT IN DEE88; VARIANT DEE88 VAL-120; FUNCTION; CHARACTERIZATIONC OF VARIANT DEE88 VAL-120;

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.