7ST9 image
Deposition Date 2021-11-12
Release Date 2022-03-23
Last Version Date 2024-06-05
Entry Detail
PDB ID:
7ST9
Keywords:
Title:
Open state of Rad24-RFC:9-1-1 bound to a 5' ss/dsDNA junction
Biological Source:
Method Details:
Experimental Method:
Resolution:
2.20 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Checkpoint protein RAD24
Gene (Uniprot):RAD24
Chain IDs:A
Chain Length:696
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
Polymer Type:polypeptide(L)
Molecule:Replication factor C subunit 4
Gene (Uniprot):RFC4
Chain IDs:B
Chain Length:323
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
Polymer Type:polypeptide(L)
Molecule:Replication factor C subunit 3
Gene (Uniprot):RFC3
Chain IDs:C
Chain Length:340
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
Polymer Type:polypeptide(L)
Molecule:Replication factor C subunit 2
Gene (Uniprot):RFC2
Chain IDs:D
Chain Length:353
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
Polymer Type:polypeptide(L)
Molecule:Replication factor C subunit 5
Gene (Uniprot):RFC5
Chain IDs:E
Chain Length:354
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
Polymer Type:polypeptide(L)
Molecule:DNA damage checkpoint control protein RAD17
Gene (Uniprot):RAD17
Chain IDs:F
Chain Length:401
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
Polymer Type:polypeptide(L)
Molecule:DNA damage checkpoint protein 1
Gene (Uniprot):DDC1
Chain IDs:G
Chain Length:646
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
Polymer Type:polypeptide(L)
Molecule:DNA damage checkpoint control protein MEC3
Gene (Uniprot):MEC3
Chain IDs:H
Chain Length:474
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
Polymer Type:polydeoxyribonucleotide
Molecule:DNA (5'-D(P*CP*GP*CP*TP*CP*CP*TP*TP*CP*CP*TP*GP*AP*CP*TP*CP*GP*TP*CP*C)-3')
Chain IDs:J (auth: I)
Chain Length:21
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae
Polymer Type:polydeoxyribonucleotide
Molecule:DNA (50-MER)
Chain IDs:I (auth: J)
Chain Length:50
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae
Primary Citation
Mechanisms of loading and release of the 9-1-1 checkpoint clamp.
Nat.Struct.Mol.Biol. 29 369 375 (2022)
PMID: 35314831 DOI: 10.1038/s41594-022-00741-7

Abstact

Single-stranded or double-stranded DNA junctions with recessed 5' ends serve as loading sites for the checkpoint clamp, 9-1-1, which mediates activation of the apical checkpoint kinase, ATRMec1. However, the basis for 9-1-1's recruitment to 5' junctions is unclear. Here, we present structures of the yeast checkpoint clamp loader, Rad24-replication factor C (RFC), in complex with 9-1-1 and a 5' junction and in a post-ATP-hydrolysis state. Unexpectedly, 9-1-1 adopts both closed and planar open states in the presence of Rad24-RFC and DNA. Moreover, Rad24-RFC associates with the DNA junction in the opposite orientation of processivity clamp loaders with Rad24 exclusively coordinating the double-stranded region. ATP hydrolysis stimulates conformational changes in Rad24-RFC, leading to disengagement of DNA-loaded 9-1-1. Together, these structures explain 9-1-1's recruitment to 5' junctions and reveal new principles of sliding clamp loading.

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Primary Citation of related structures