How a gene mutation makes an enzyme hyperactive
Disease-Associated Mutation A554V Disrupts Normal Autoinhibition of DNMT1
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Scientists studied a specific mutation (A554V) in DNMT1, an enzyme that adds methyl groups to DNA. This mutation is linked to adult-onset neurodegenerative disorders. The mutation disrupts a normal 'brake' mechanism (RFTS domain) that keeps DNMT1 inactive until needed.
Surprising Findings
The isolated RFTS domain appears completely normal despite causing disease
You'd expect the mutation to directly damage the RFTS domain since that's where the mutation occurs. Instead, the mutation weakens the interaction between RFTS and the methyltransferase domain—affecting how the two parts talk to each other.
Practical Takeaways
This research could inform drug design targeting the DNMT1-RFTS interaction
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Scientists studied a specific mutation (A554V) in DNMT1, an enzyme that adds methyl groups to DNA. This mutation is linked to adult-onset neurodegenerative disorders. The mutation disrupts a normal 'brake' mechanism (RFTS domain) that keeps DNMT1 inactive until needed.
Surprising Findings
The isolated RFTS domain appears completely normal despite causing disease
You'd expect the mutation to directly damage the RFTS domain since that's where the mutation occurs. Instead, the mutation weakens the interaction between RFTS and the methyltransferase domain—affecting how the two parts talk to each other.
Practical Takeaways
This research could inform drug design targeting the DNMT1-RFTS interaction
Publication
Journal
DNA
Year
2023
Authors
Rebecca L. Switzer, Zach J Hartman, G. Hewett, Clara F. Carroll
Related Content
Claims (7)
Scientists found that a small genetic change called A554V makes a protein involved in DNA copying slightly less stable when heated, dropping its stability by about 2 degrees Celsius - but this doesn't happen when they look at just the part of the protein where the change occurs.
Scientists found that one specific genetic change called A554V makes a protein stick to DNA much stronger than other similar genetic changes do - about 8 times stronger compared to only 2.5-3.5 times stronger for the others.
A specific genetic change called A554V makes a protein that controls DNA tagging work much faster than normal.
Scientists found that a specific genetic change called A554V in a protein called DNMT1 makes it stick to DNA about 8 times tighter than normal.
A specific genetic change called A554V messes up a natural 'brake' on a protein that copies DNA patterns, making it harder for two parts of that protein to stick together properly.