6ZZ6

Cryo-EM structure of S.cerevisiae cohesin-Scc2-DNA complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.40 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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Literature

Transport of DNA within cohesin involves clamping on top of engaged heads by Scc2 and entrapment within the ring by Scc3.

Collier, J.E.Lee, B.G.Roig, M.B.Yatskevich, S.Petela, N.J.Metson, J.Voulgaris, M.Gonzalez Llamazares, A.Lowe, J.Nasmyth, K.A.

(2020) Elife 9

  • DOI: 10.7554/eLife.59560
  • Primary Citation of Related Structures:  
    6ZZ6

  • PubMed Abstract: 
  • In addition to extruding DNA loops, cohesin entraps within its SMC-kleisin ring (S-K) individual DNAs during G1 and sister DNAs during S-phase. All three activities require related hook-shaped proteins called Scc2 and Scc3. Using thiol-specific crosslinking we provide rigorous proof of entrapment activity in vitro ...

    In addition to extruding DNA loops, cohesin entraps within its SMC-kleisin ring (S-K) individual DNAs during G1 and sister DNAs during S-phase. All three activities require related hook-shaped proteins called Scc2 and Scc3. Using thiol-specific crosslinking we provide rigorous proof of entrapment activity in vitro. Scc2 alone promotes entrapment of DNAs in the E-S and E-K compartments, between ATP-bound engaged heads and the SMC hinge and associated kleisin, respectively. This does not require ATP hydrolysis nor is it accompanied by entrapment within S-K rings, which is a slower process requiring Scc3. Cryo-EM reveals that DNAs transported into E-S/E-K compartments are 'clamped' in a sub-compartment created by Scc2's association with engaged heads whose coiled coils are folded around their elbow. We suggest that clamping may be a recurrent feature of cohesin complexes active in loop extrusion and that this conformation precedes the S-K entrapment required for sister chromatid cohesion.


    Organizational Affiliation

    Department of Biochemistry, University of Oxford, Oxford, United Kingdom.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Structural maintenance of chromosomes protein 1,Structural maintenance of chromosomes protein 1,Structural maintenance of chromosomes protein 1A360Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: SMC1CHL10YFL008W
UniProt
Find proteins for P32908 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Go to UniProtKB:  P32908
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Structural maintenance of chromosomes protein 3,Structural maintenance of chromosomes protein 3,Structural maintenance of chromosomes protein 3B423Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: SMC3YJL074CJ1049
UniProt
Find proteins for P47037 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Sister chromatid cohesion protein 1,Sister chromatid cohesion protein 1,Sister chromatid cohesion protein 1C83Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: MCD1PDS3RHC21SCC1YDL003WYD8119.04
UniProt
Find proteins for Q12158 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Sister chromatid cohesion protein 2D1493Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: SCC2YDR180WYD9395.14
UniProt
Find proteins for Q04002 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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  • Reference Sequence
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Entity ID: 5
MoleculeChainsLengthOrganismImage
DNA (34-MER)E [auth F]34synthetic construct
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Entity ID: 6
MoleculeChainsLengthOrganismImage
DNA (34-MER)F [auth G]34synthetic construct
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP

Download Ideal Coordinates CCD File 
G [auth A], I [auth B]ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N
 Ligand Interaction
MG
Query on MG

Download Ideal Coordinates CCD File 
H [auth A], J [auth B]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.40 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Wellcome TrustUnited Kingdom202754/Z/16/Z
Medical Research Council (MRC, United Kingdom)United KingdomU105184326

Revision History  (Full details and data files)

  • Version 1.0: 2020-09-30
    Type: Initial release