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Paul Dominc Olinares

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Articles

Distinct Quaternary States, Intermediates, and Autoinhibition During Loading of the DnaB-Replicative Helicase by the Phage λP Helicase Loader

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By Abhipsa Shatarupa, Dhanjai Brown, Paul Dominc Olinares, Jillian D Chase
| BioRxiv
Abstract Replicative helicases require loader proteins for assembly at the origins of DNA replication. Multiple copies of the bacteriophage Lambda P (P) loader bind to and load the E. coli DnaB (B) replicative helicase on replication-origin-derived single-stranded DNA. We find that the E. coli DnaB-Lambda P complex exists in two forms: B6P5 and B6P6. In the 2.66 angstroms cryo-EM model of B6P5, five copies of the Lambda P loader assemble into a crown-like shape that tightly grips DnaB.
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