6RRK

Crystal structure of the central region of human cohesin subunit STAG1 in complex with RAD21 peptide

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.17 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.222 

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This is version 1.2 of the entry. See complete history. 


Literature

STAG1 vulnerabilities for exploiting cohesin synthetic lethality in STAG2-deficient cancers.

van der Lelij, P., Newman, J.A., Lieb, S., Jude, J., Katis, V., Hoffmann, T., Hinterndorfer, M., Bader, G., Kraut, N., Pearson, M.A., Peters, J.M., Zuber, J., Gileadi, O., Petronczki, M.

(2020) Life Sci Alliance 3

  • DOI: 10.26508/lsa.202000725
  • Primary Citation of Related Structures:  
    6QB5, 6R7O, 6RRC, 6RRK

  • PubMed Abstract: 

    • The cohesin subunit STAG2 has emerged as a recurrently inactivated tumor suppressor in human cancers. Using candidate approaches, recent studies have revealed a synthetic lethal interaction between STAG2 and its paralog STAG1 To systematically probe genetic vulnerabilities in the absence of STAG2, we have performed genome-wide CRISPR screens in isogenic cell lines and identified STAG1 as the most prominent and selective dependency of STAG2-deficient cells ...

    The cohesin subunit STAG2 has emerged as a recurrently inactivated tumor suppressor in human cancers. Using candidate approaches, recent studies have revealed a synthetic lethal interaction between STAG2 and its paralog STAG1 To systematically probe genetic vulnerabilities in the absence of STAG2, we have performed genome-wide CRISPR screens in isogenic cell lines and identified STAG1 as the most prominent and selective dependency of STAG2-deficient cells. Using an inducible degron system, we show that chemical genetic degradation of STAG1 protein results in the loss of sister chromatid cohesion and rapid cell death in STAG2-deficient cells, while sparing STAG2 -wild-type cells. Biochemical assays and X-ray crystallography identify STAG1 regions that interact with the RAD21 subunit of the cohesin complex. STAG1 mutations that abrogate this interaction selectively compromise the viability of STAG2 -deficient cells. Our work highlights the degradation of STAG1 and inhibition of its interaction with RAD21 as promising therapeutic strategies. These findings lay the groundwork for the development of STAG1-directed small molecules to exploit synthetic lethality in STAG2 -mutated tumors.

    Organizational Affiliation: 

    Boehringer Ingelheim Regional Center Vienna (RCV) GmbH & Co KG, Vienna, Austria mark_paul.petronczki@boehringer-ingelheim.com.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cohesin subunit SA-1B [auth A],
A [auth B]		459Homo sapiensMutation(s): 0 
Gene Names: STAG1, SA1, SCC3
UniProt & NIH Common Fund Data Resources
Find proteins for Q8WVM7 (Homo sapiens)
Explore Q8WVM7 
Go to UniProtKB:  Q8WVM7
PHAROS:  Q8WVM7
GTEx:  ENSG00000118007 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8WVM7
Protein Feature View
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  • Reference Sequence
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(by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Double-strand-break repair protein rad21 homologC, D40Homo sapiensMutation(s): 0 
Gene Names: RAD21, HR21, KIAA0078, NXP1, SCC1
UniProt & NIH Common Fund Data Resources
Find proteins for O60216 (Homo sapiens)
Explore O60216 
Go to UniProtKB:  O60216
PHAROS:  O60216
GTEx:  ENSG00000164754 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO60216
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.17 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.222 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.333α = 90
b = 86.29β = 95.36
c = 118.585γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
DIALSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Wellcome TrustUnited Kingdom--

Revision History  (Full details and data files)

  • Version 1.0: 2019-06-26
    Type: Initial release
  • Version 1.1: 2019-08-21
    Changes: Data collection
  • Version 1.2: 2020-08-19
    Changes: Database references