Journal
OPEN BIOLOGY
Volume 11, Issue 10, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rsob.210121
Keywords
MTBP; Treslin; TopBP1; DDK; PP1; simurosertib
Categories
Funding
- CR-UK programme [C303/A14301]
- Wellcome Trust [WT096598MA, 097945/Z/11/Z]
- BBSRC studentship
- Wellcome Trust [097945/Z/11/Z] Funding Source: Wellcome Trust
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Treslin/Ticrr is essential for DNA replication initiation and forms a complex with MTBP. DDK and CDK activities cooperate to regulate the interaction of Treslin-MTBP, which is crucial for selecting replication origins. This study provides insights into the mechanisms behind replication initiation regulation.
Treslin/Ticrr is required for the initiation of DNA replication and binds to MTBP (Mdm2 Binding Protein). Here, we show that in Xenopus egg extract, MTBP forms an elongated tetramer with Treslin containing two molecules of each protein. Immunodepletion and add-back experiments show that Treslin-MTBP is rate limiting for replication initiation. It is recruited onto chromatin before S phase starts and recruitment continues during S phase. We show that DDK activity both increases and strengthens the interaction of Treslin-MTBP with licensed chromatin. We also show that DDK activity cooperates with CDK activity to drive the interaction of Treslin-MTBP with TopBP1 which is a regulated crucial step in pre-initiation complex formation. These results suggest how DDK works together with CDKs to regulate Treslin-MTBP and plays a crucial in selecting which origins will undergo initiation.
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