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- EMDB-33959: Cryo-EM structure of Cas7-11-crRNA-Csx29 ternary complex -

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Basic information

Entry
Database: EMDB / ID: EMD-33959
TitleCryo-EM structure of Cas7-11-crRNA-Csx29 ternary complex
Map data
Sample
  • Complex: Cas7-11-crRNA-Csx29 ternary complex
    • Protein or peptide: CRISPR-associated RAMP family protein
    • RNA: crRNA (38-MER)
    • Protein or peptide: CHAT domain-containing protein
KeywordsCas7-11 / crRNA / CRISPR-Cas / Csx29 / RNA BINDING PROTEIN
Function / homologyCHAT domain / CHAT domain / : / CRISPR type III-associated protein / RAMP superfamily / defense response to virus / CRISPR-associated RAMP family protein / CHAT domain-containing protein
Function and homology information
Biological speciesDesulfonema ishimotonii (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.29 Å
AuthorsHuo Y / Dong Q / Zhao H / Jiang T
Funding support China, 1 items
OrganizationGrant numberCountry
Chinese Academy of SciencesXDB37010301 China
CitationJournal: Nat Microbiol / Year: 2023
Title: Cryo-EM structure and protease activity of the type III-E CRISPR-Cas effector.
Authors: Yangao Huo / Hongshen Zhao / Qinghua Dong / Tao Jiang /
Abstract: The recently discovered type III-E CRISPR-Cas effector Cas7-11 shows promise when used as an RNA manipulation tool, but its structure and the mechanisms underlying its function remain unclear. Here ...The recently discovered type III-E CRISPR-Cas effector Cas7-11 shows promise when used as an RNA manipulation tool, but its structure and the mechanisms underlying its function remain unclear. Here we present four cryo-EM structures of Desulfonema ishimotonii Cas7-11-crRNA complex in pre-target and target RNA-bound states, and the cryo-EM structure of DiCas7-11-crRNA bound to its accessory protein DiCsx29. These data reveal structural elements for pre-crRNA processing, target RNA cleavage and regulation. Moreover, a 3' seed region of crRNA is involved in regulating RNA cleavage activity of DiCas7-11-crRNA-Csx29. Our analysis also shows that both the minimal mismatch of 4 nt to the 5' handle of crRNA and the minimal matching of the first 12 nt of the spacer by the target RNA are essential for triggering the protease activity of DiCas7-11-crRNA-Csx29 towards DiCsx30. Taken together, we propose that target RNA recognition and cleavage regulate and fine-tune the protease activity of DiCas7-11-crRNA-Csx29, thus preventing auto-immune responses.
History
DepositionJul 30, 2022-
Header (metadata) releaseFeb 1, 2023-
Map releaseFeb 1, 2023-
UpdateOct 16, 2024-
Current statusOct 16, 2024Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_33959.png

Downloads & links

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Map

FileDownload / File: emd_33959.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
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Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.07 Å/pix.
x 360 pix.
= 385.2 Å		1.07 Å/pix.
x 360 pix.
= 385.2 Å		1.07 Å/pix.
x 360 pix.
= 385.2 Å

Surface

Projections

Slices (1/3)

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.07 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0192
Minimum - Maximum-0.07842161 - 0.15671109
Average (Standard dev.)0.000031069056 (±0.0033405484)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 385.2 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_33959_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_33959_half_map_2.map
Projections & Slices
AxesZYX

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Histogram

Histogram (log scale)

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Sample components

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Entire : Cas7-11-crRNA-Csx29 ternary complex

EntireName: Cas7-11-crRNA-Csx29 ternary complex
Components
  • Complex: Cas7-11-crRNA-Csx29 ternary complex
    • Protein or peptide: CRISPR-associated RAMP family protein
    • RNA: crRNA (38-MER)
    • Protein or peptide: CHAT domain-containing protein

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Supramolecule #1: Cas7-11-crRNA-Csx29 ternary complex

SupramoleculeName: Cas7-11-crRNA-Csx29 ternary complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#3
Source (natural)Organism: Desulfonema ishimotonii (bacteria)

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Macromolecule #1: CRISPR-associated RAMP family protein

MacromoleculeName: CRISPR-associated RAMP family protein / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Desulfonema ishimotonii (bacteria)
Molecular weightTheoretical: 183.933 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MTTTMKISIE FLEPFRMTKW QESTRRNKNN KEFVRGQAFA RWHRNKKDNT KGRPYITGTL LRSAVIRSAE NLLTLSDGKI SEKTCCPGK FDTEDKDRLL QLRQRSTLRW TDKNPCPDNA ETYCPFCELL GRSGNDGKKA EKKDWRFRIH FGNLSLPGKP D FDGPKAIG ...String:
MTTTMKISIE FLEPFRMTKW QESTRRNKNN KEFVRGQAFA RWHRNKKDNT KGRPYITGTL LRSAVIRSAE NLLTLSDGKI SEKTCCPGK FDTEDKDRLL QLRQRSTLRW TDKNPCPDNA ETYCPFCELL GRSGNDGKKA EKKDWRFRIH FGNLSLPGKP D FDGPKAIG SQRVLNRVDF KSGKAHDFFK AYEVDHTRFP RFEGEITIDN KVSAEARKLL CDSLKFTDRL CGALCVIRFD EY TPAADSG KQTENVQAEP NANLAEKTAE QIISILDDNK KTEYTRLLAD AIRSLRRSSK LVAGLPKDHD GKDDHYLWDI GKK KKDENS VTIRQILTTS ADTKELKNAG KWREFCEKLG EALYLKSKDM SGGLKITRRI LGDAEFHGKP DRLEKSRSVS IGSV LKETV VCGELVAKTP FFFGAIDEDA KQTDLQVLLT PDNKYRLPRS AVRGILRRDL QTYFDSPCNA ELGGRPCMCK TCRIM RGIT VMDARSEYNA PPEIRHRTRI NPFTGTVAEG ALFNMEVAPE GIVFPFQLRY RGSEDGLPDA LKTVLKWWAE GQAFMS GAA STGKGRFRME NAKYETLDLS DENQRNDYLK NWGWRDEKGL EELKKRLNSG LPEPGNYRDP KWHEINVSIE MASPFIN GD PIRAAVDKRG TDVVTFVKYK AEGEEAKPVC AYKAESFRGV IRSAVARIHM EDGVPLTELT HSDCECLLCQ IFGSEYEA G KIRFEDLVFE SDPEPVTFDH VAIDRFTGGA ADKKKFDDSP LPGSPARPLM LKGSFWIRRD VLEDEEYCKA LGKALADVN NGLYPLGGKS AIGYGQVKSL GIKGDDKRIS RLMNPAFDET DVAVPEKPKT DAEVRIEAEK VYYPHYFVEP HKKVEREEKP CGHQKFHEG RLTGKIRCKL ITKTPLIVPD TSNDDFFRPA DKEARKEKDE YHKSYAFFRL HKQIMIPGSE LRGMVSSVYE T VTNSCFRI FDETKRLSWR MDADHQNVLQ DFLPGRVTAD GKHIQKFSET ARVPFYDKTQ KHFDILDEQE IAGEKPVRMW VK RFIKRLS LVDPAKHPQK KQDNKWKRRK EGIATFIEQK NGSYYFNVVT NNGCTSFHLW HKPDNFDQEK LEGIQNGEKL DCW VRDSRY QKAFQEIPEN DPDGWECKEG YLHVVGPSKV EFSDKKGDVI NNFQGTLPSV PNDWKTIRTN DFKNRKRKNE PVFC CEDDK GNYYTMAKYC ETFFFDLKEN EEYEIPEKAR IKYKELLRVY NNNPQAVPES VFQSRVAREN VEKLKSGDLV YFKHN EKYV EDIVPVRISR TVDDRMIGKR MSADLRPCHG DWVEDGDLSA LNAYPEKRLL LRHPKGLCPA CRLFGTGSYK GRVRFG FAS LENDPEWLIP GKNPGDPFHG GPVMLSLLER PRPTWSIPGS DNKFKVPGRK FYVHHHAWKT IKDGNHPTTG KAIEQSP NN RTVEALAGGN SFSFEIAFEN LKEWELGLLI HSLQLEKGLA HKLGMAKSMG FGSVEIDVES VRLRKDWKQW RNGNSEIP N WLGKGFAKLK EWFRDELDFI ENLKKLLWFP EGDQAPRVCY PMLRKKDDPN GNSGYEELKD GEFKKEDRQK KLTTPWTPW A

UniProtKB: CRISPR-associated RAMP family protein

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Macromolecule #3: CHAT domain-containing protein

MacromoleculeName: CHAT domain-containing protein / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Desulfonema ishimotonii (bacteria)
Molecular weightTheoretical: 88.311875 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MSNPIRDIQD RLKTAKFDNK DDMMNLASSL YKYEKQLMDS SEATLCQQGL SNRPNSFSQL SQFRDSDIQS KAGGQTGKFW QNEYEACKN FQTHKERRET LEQIIRFLQN GAEEKDADDL LLKTLARAYF HRGLLYRPKG FSVPARKVEA MKKAIAYCEI I LDKNEEES ...String:
MSNPIRDIQD RLKTAKFDNK DDMMNLASSL YKYEKQLMDS SEATLCQQGL SNRPNSFSQL SQFRDSDIQS KAGGQTGKFW QNEYEACKN FQTHKERRET LEQIIRFLQN GAEEKDADDL LLKTLARAYF HRGLLYRPKG FSVPARKVEA MKKAIAYCEI I LDKNEEES EALRIWLYAA MELRRCGEEY PENFAEKLFY LANDGFISEL YDIRLFLEYT EREEDNNFLD MILQENQDRE RL FELCLYK ARACFHLNQL NDVRIYGESA IDNAPGAFAD PFWDELVEFI RMLRNKKSEL WKEIAIKAWD KCREKEMKVG NNI YLSWYW ARQRELYDLA FMAQDGIEKK TRIADSLKSR TTLRIQELNE LRKDAHRKQN RRLEDKLDRI IEQENEARDG AYLR RNPPC FTGGKREEIP FARLPQNWIA VHFYLNELES HEGGKGGHAL IYDPQKAEKD QWQDKSFDYK ELHRKFLEWQ ENYIL NEEG SADFLVTLCR EIEKAMPFLF KSEVIPEDRP VLWIPHGFLH RLPLHAAMKS GNNSNIEIFW ERHASRYLPA WHLFDP APY SREESSTLLK NFEEYDFQNL ENGEIEVYAP SSPKKVKEAI RENPAILLLL CHGEADMTNP FRSCLKLKNK DMTIFDL LT VEDVRLSGSR ILLGACESDM VPPLEFSVDE HLSVSGAFLS HKAGEIVAGL WTVDSEKVDE CYSYLVEEKD FLRNLQEW Q MAETENFRSE NDSSLFYKIA PFRIIGFPAE

UniProtKB: CHAT domain-containing protein

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Macromolecule #2: crRNA (38-MER)

MacromoleculeName: crRNA (38-MER) / type: rna / ID: 2 / Number of copies: 1
Source (natural)Organism: Desulfonema ishimotonii (bacteria)
Molecular weightTheoretical: 15.094032 KDa
SequenceString:
UUGAUGUCAC GGAACAGGAA CUUGAACAAC AUCGUUACUA ACGAGCU

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 60.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.3 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: OTHER
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.29 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 389783
Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: ANGULAR RECONSTITUTION

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