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- PDB-8d9i: gRAMP non-matching PFS-with Mg -

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Basic information

Entry
Database: PDB / ID: 8d9i
TitlegRAMP non-matching PFS-with Mg
Components
  • RAMP superfamily protein
  • RNA (35-MER)
  • RNA (5'-R(P*UP*CP*CP*GP*GP*GP*GP*CP*AP*GP*AP*AP*AP*AP*UP*UP*GP*GP*A)-3')
KeywordsRNA BINDING PROTEIN/RNA / CRISPR / GRAMP / RNA BINDING PROTEIN / RNA BINDING PROTEIN-RNA complex
Function / homology: / CRISPR type III-associated protein / RAMP superfamily / defense response to virus / RNA / RNA (> 10) / RAMP superfamily protein
Function and homology information
Biological speciesCandidatus Scalindua brodae (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.62 Å
AuthorsHu, C. / Nam, K.H. / Schuler, G. / Ke, A.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM118174 United States
CitationJournal: Science / Year: 2022
Title: Craspase is a CRISPR RNA-guided, RNA-activated protease.
Authors: Chunyi Hu / Sam P B van Beljouw / Ki Hyun Nam / Gabriel Schuler / Fran Ding / Yanru Cui / Alicia Rodríguez-Molina / Anna C Haagsma / Menno Valk / Martin Pabst / Stan J J Brouns / Ailong Ke /
Abstract: The CRISPR-Cas type III-E RNA-targeting effector complex gRAMP/Cas7-11 is associated with a caspase-like protein (TPR-CHAT/Csx29) to form Craspase (CRISPR-guided caspase). Here, we use cryo-electron ...The CRISPR-Cas type III-E RNA-targeting effector complex gRAMP/Cas7-11 is associated with a caspase-like protein (TPR-CHAT/Csx29) to form Craspase (CRISPR-guided caspase). Here, we use cryo-electron microscopy snapshots of Craspase to explain its target RNA cleavage and protease activation mechanisms. Target-guide pairing extending into the 5' region of the guide RNA displaces a gating loop in gRAMP, which triggers an extensive conformational relay that allosterically aligns the protease catalytic dyad and opens an amino acid side-chain-binding pocket. We further define Csx30 as the endogenous protein substrate that is site-specifically proteolyzed by RNA-activated Craspase. This protease activity is switched off by target RNA cleavage by gRAMP and is not activated by RNA targets containing a matching protospacer flanking sequence. We thus conclude that Craspase is a target RNA-activated protease with self-regulatory capacity.
History
DepositionJun 9, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jun 14, 2023Provider: repository / Type: Initial release
Revision 1.1Nov 6, 2024Group: Data collection / Structure summary
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update / _pdbx_entry_details.has_protein_modification

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
B: RAMP superfamily protein
D: RNA (5'-R(P*UP*CP*CP*GP*GP*GP*GP*CP*AP*GP*AP*AP*AP*AP*UP*UP*GP*GP*A)-3')
C: RNA (35-MER)
hetero molecules


Theoretical massNumber of molelcules
Total (without water)160,6227
Polymers160,3613
Non-polymers2624
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: native gel electrophoresis
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein RAMP superfamily protein / gRAMP


Mass: 143101.500 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Candidatus Scalindua brodae (bacteria) / Gene: SCABRO_02597
Production host: Escherichia coli 'BL21-Gold(DE3)pLysS AG' (bacteria)
References: UniProt: A0A0B0EGF3
#2: RNA chain RNA (5'-R(P*UP*CP*CP*GP*GP*GP*GP*CP*AP*GP*AP*AP*AP*AP*UP*UP*GP*GP*A)-3')


Mass: 6180.762 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Candidatus Scalindua brodae (bacteria)
Production host: Escherichia coli 'BL21-Gold(DE3)pLysS AG' (bacteria)
#3: RNA chain RNA (35-MER)


Mass: 11078.582 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Candidatus Scalindua brodae (bacteria)
Production host: Escherichia coli 'BL21-Gold(DE3)pLysS AG' (bacteria)
#4: Chemical
ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Zn / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: gRAMP-non matching PFS-with Mg / Type: COMPLEX / Entity ID: #1-#3 / Source: RECOMBINANT
Source (natural)Organism: Candidatus Scalindua brodae (bacteria)
Source (recombinant)Organism: Escherichia coli 'BL21-Gold(DE3)pLysS AG' (bacteria)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2500 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

CTF correctionType: NONE
3D reconstructionResolution: 3.62 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 79785 / Symmetry type: POINT

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