TOP3A - NM_004618 - protein view

After several years of serving the research community, our ActiveDriverDB database will be retired on May 1st 2026. Please make sure to download any data you need and update your links or workflows before that date.

We want to sincerely thank all our users for their support, feedback, and collaboration over the years — your contributions have been invaluable to this project. A special thank you to Dr. Michal Krassowski for leading the development of our open-source software and database.

For any questions or assistance, please contact Jüri Reimand (juri.reimand@utoronto.ca).

You are viewing an updated version (2021) of the ActiveDriverDB. To view the previous version please visit activedriverdb.org/v2020

Mutations Visualisation

The Mutations Visualisation needle plot provides a visual summary of the location, frequency and functional significance of all known mutations in your protein of interest. The placement of the pins corresponds to the location along the protein’s sequence, while the mutation impact and PTM associated with it is explained in the figure legend.

- Height (y axis) represents the number of occurrences of the mutation
- Horizontal position (x axis) represents the position along your protein’s amino acid sequence
- Pinhead colour represents the mutation impact (figure legend)
- X axis colouring represents the type of PTM associated with the mutation location (figure legend)

Zooming in/out
Too zoom in/out of a specific amino acid sequence, you can either use the magnifying glass icons below the needle plot, or you can use your mouse scroll wheel while hovering over the needle plot. Furthermore, you can enter a specific amino acid sequence range in the search bar and hit “Go!”

Saving the image
The Mutations Visualisation figure can be saved as an SVG or PDF format by clicking on the “Save image as” button at the top right of the plot.

Tracks
While the x axis of the Mutations Visualization plot indicates the amino acid sequence location, additional positional details are visualized using the tracks found here:

- Sequence track: amino acid sequence of your protein of interest
- Disorder track: (Not sure about this myself)
- Domains track: proteins domains identified in the amino acid sequence
- Mutations track: the specific amino acid substitutions detected at the specific site

If there is a specific region of the amino acid sequence you are interested in, you can zoom onto it using the magnifying glass icons below the Mutations Visualization plot. Alternatively, you can zoom in and out by using your mouse scroll wheel while hovering over the needle plot.

amino acids

Protein summary

The protein summary provides brief information regarding your protein, namely: its full name, a brief description of its function, and genomic location of the coding gene.

This is preferred isoform of TOP3A protein.

TOP3A: DNA topoisomerase 3-alpha isoform 1

Description:

This gene encodes a DNA topoisomerase, an enzyme that controls and alters the topologic states of DNA during transcription. This enzyme catalyzes the transient breaking and rejoining of a single strand of DNA which allows the strands to pass through one another, thus reducing the number of supercoils and altering the topology of DNA. This enzyme forms a complex with BLM which functions in the regulation of recombination in somatic cells. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Mar 2016].

Strand: -
Chromosome: 17

Protein: 1001 residues
All mutations: 161

PTM sites: 23
CDS: 18,178,115 - 18,218,092
Transcription: 18,177,234 - 18,218,321

21.38% of sequence is predicted to be disordered

External references

RefSeq, Entrez, Uniprot and Enzembl IDs related to your search query.

Mappings retrieved from NCBI & UniProt.

RefSeq RefSeq IDs relevant to your search query.

Entrez: gene: 7156

UniProt All links following an Uniprot accession refer to this accession. Orange icon ( ) next to an accession indicates that the entry belongs to SwissProt: a reviewed subset of Uniprot knowledgebase. Rarely links to external resources may not work. This is common for new or unreviewed ( ) entries.

Ensembl

TOP3A (NM_004618) - DNA topoisomerase III alpha

Data Filters

Show only the mutations which affect specific PTM sites and/or in specific populations (updates both the Mutations Visualisation plot and table found on the Sequence View tab, and the PTM Interaction Network Visualisation plot found on the Network View tab)

Legend

Sites

Amino acid sites/regions enriched for mutations affecting post-translational modifications (PTMs).

Others

Protein summary

The protein summary provides brief information regarding your protein, namely: its full name, a brief description of its function, and genomic location of the coding gene.

External references

RefSeq, Entrez, Uniprot and Enzembl IDs related to your search query.

TOP3A (NM_004618) - DNA topoisomerase III alpha

Data Filters Show only the mutations which affect specific PTM sites and/or in specific populations (updates both the Mutations Visualisation plot and table found on the Sequence View tab, and the PTM Interaction Network Visualisation plot found on the Network View tab)

Legend

Sites Amino acid sites/regions enriched for mutations affecting post-translational modifications (PTMs).

Others

Protein summary The protein summary provides brief information regarding your protein, namely: its full name, a brief description of its function, and genomic location of the coding gene.

External references RefSeq, Entrez, Uniprot and Enzembl IDs related to your search query.

Data Filters

Show only the mutations which affect specific PTM sites and/or in specific populations (updates both the Mutations Visualisation plot and table found on the Sequence View tab, and the PTM Interaction Network Visualisation plot found on the Network View tab)

Sites

Amino acid sites/regions enriched for mutations affecting post-translational modifications (PTMs).

Protein summary

The protein summary provides brief information regarding your protein, namely: its full name, a brief description of its function, and genomic location of the coding gene.

External references

RefSeq, Entrez, Uniprot and Enzembl IDs related to your search query.