Variant information:

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Variant position: 520

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

Type of variant: Polymorphism

The variants are classified into three categories: Disease, Polymorphism and Unclassified.

• Disease: Variants have been found in patients and disease-association is reported in literature. However, this classification is not a definitive assessment of variant pathogenicity.
• Polymorphism: No disease-association has been reported.
• Unclassified: Variants have been found in patients but disease-association remains unclear.

Residue change: From Lysine (K) to Arginine (R) at position 520 (K520R, p.Lys520Arg).

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 large size and basic.

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

Polymorphism: A polymorphism 1.2 kb upstream of the MAOA coding sequences consists of a 30-bp repeated sequence present in 3, 3.5, 4, or 5 copies. The polymorphism affect transcriptional activity of the MAOA gene promoter. Alleles with 3.5 or 4 copies of the repeat sequence are transcribed 2 to 10 times more efficiently than those with 3 or 5 copies of the repeat.

Additional information on the polymorphism described.

Other resources: 

Links to websites of interest for the variant.

• GeneReviews
• Wikipedia; Monoamine oxidase entry
• Variant rs1800466 [ dbSNP | Ensembl ]

Sequence information:

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Variant position: 520

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

Protein sequence length: 527

The length of the canonical sequence.

Location on the sequence:  GLLKIIGFSTSVTALGFVLY  K YKLLPRS

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                         GLLKIIGFSTSVTALGFVLYKYKLLPRS

Mouse                         GLLKITGFSTSVALLCFVLYKF-KQPQS

Rat                           GLLKITGVSTSVALLCFVLYKIKKLPC-

Pig                           GLLKIIGFSTSVTALWLAVYKFRLLTRS

Bovine                        GLLKIVGFSTSITALWFVMYRFRLLSRS

Dog                           GLLKLIGFTTSVTALWIVAYKFRLLRRS

Horse                         GLLKIIGFSTSITALWIVVYKFKLLTRS

Slime mold                    -----------------------LNSKL

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.

Type	Positions	Description
Chain	1 – 527	Amine oxidase [flavin-containing] A
Topological domain	519 – 527	Mitochondrial intermembrane
Region	520 – 522	Interaction with membrane phospholipid headgroups
Helix	498 – 520

Literature citations

No reference for the current variant in UniProtKB/Swiss-Prot.