7KHA

Cryo-EM Structure of the Desulfovibrio vulgaris Type I-C Apo Cascade


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.13 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural basis for assembly of non-canonical small subunits into type I-C Cascade.

O'Brien, R.E.Santos, I.C.Wrapp, D.Bravo, J.P.K.Schwartz, E.A.Brodbelt, J.S.Taylor, D.W.

(2020) Nat Commun 11: 5931-5931

  • DOI: 10.1038/s41467-020-19785-8
  • Primary Citation of Related Structures:  
    7KHA

  • PubMed Abstract: 
  • Bacteria and archaea employ CRISPR (clustered, regularly, interspaced, short palindromic repeats)-Cas (CRISPR-associated) systems as a type of adaptive immunity to target and degrade foreign nucleic acids. While a myriad of CRISPR-Cas systems have been identified to date, type I-C is one of the most commonly found subtypes in nature ...

    Bacteria and archaea employ CRISPR (clustered, regularly, interspaced, short palindromic repeats)-Cas (CRISPR-associated) systems as a type of adaptive immunity to target and degrade foreign nucleic acids. While a myriad of CRISPR-Cas systems have been identified to date, type I-C is one of the most commonly found subtypes in nature. Interestingly, the type I-C system employs a minimal Cascade effector complex, which encodes only three unique subunits in its operon. Here, we present a 3.1 Å resolution cryo-EM structure of the Desulfovibrio vulgaris type I-C Cascade, revealing the molecular mechanisms that underlie RNA-directed complex assembly. We demonstrate how this minimal Cascade utilizes previously overlooked, non-canonical small subunits to stabilize R-loop formation. Furthermore, we describe putative PAM and Cas3 binding sites. These findings provide the structural basis for harnessing the type I-C Cascade as a genome-engineering tool.


    Organizational Affiliation

    Livestrong Cancer Institutes, Dell Medical School, Austin, TX, 78712, USA. dtaylor@utexas.edu.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CRISPR-associated protein, CT1134 familyA220Desulfovibrio vulgaris str. HildenboroughMutation(s): 0 
Gene Names: DVUA0130
UniProt
Find proteins for Q72WF9 (Desulfovibrio vulgaris (strain ATCC 29579 / DSM 644 / NCIMB 8303 / VKM B-1760 / Hildenborough))
Explore Q72WF9 
Go to UniProtKB:  Q72WF9
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
CRISPR-associated protein, TM1801 familyB, C, D, E, F, G, H290Desulfovibrio vulgaris str. HildenboroughMutation(s): 0 
Gene Names: DVUA0132
UniProt
Find proteins for Q72WF7 (Desulfovibrio vulgaris (strain ATCC 29579 / DSM 644 / NCIMB 8303 / VKM B-1760 / Hildenborough))
Explore Q72WF7 
Go to UniProtKB:  Q72WF7
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
CRISPR-associated protein, CT1133 familyI533Desulfovibrio vulgaris str. HildenboroughMutation(s): 0 
Gene Names: DVUA0131
UniProt
Find proteins for Q72WF8 (Desulfovibrio vulgaris (strain ATCC 29579 / DSM 644 / NCIMB 8303 / VKM B-1760 / Hildenborough))
Explore Q72WF8 
Go to UniProtKB:  Q72WF8
Protein Feature View
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
CRISPR-associated protein, CT1133 familyJ [auth K], K [auth L]124Desulfovibrio vulgaris str. HildenboroughMutation(s): 0 
Gene Names: DVUA0131
UniProt
Find proteins for Q72WF8 (Desulfovibrio vulgaris (strain ATCC 29579 / DSM 644 / NCIMB 8303 / VKM B-1760 / Hildenborough))
Explore Q72WF8 
Go to UniProtKB:  Q72WF8
Protein Feature View
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  • Reference Sequence
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Entity ID: 5
MoleculeChainsLengthOrganismImage
RNA (45-MER)L [auth J]45Desulfovibrio vulgaris str. Hildenborough
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.13 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Welch FoundationUnited StatesF-1938
Cancer Prevention and Research Institute of Texas (CPRIT)United StatesRR160088

Revision History  (Full details and data files)

  • Version 1.0: 2020-11-11
    Type: Initial release
  • Version 1.1: 2021-04-14
    Changes: Database references