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- EMDB-20832: Cryo-EM structure of the PrgHK periplasmic ring from the Salmonel... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-20832 | |||||||||
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Title | Cryo-EM structure of the PrgHK periplasmic ring from the Salmonella SPI-1 type III secretion needle complex solved at 3.3 angstrom resolution | |||||||||
![]() | primary map | |||||||||
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![]() | BACTERIAL NANOMACHINE / TYPE III SECRETION SYSTEM / MEMBRANE PROTEIN | |||||||||
Function / homology | ![]() | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.3 Å | |||||||||
![]() | Butan C / Galan J | |||||||||
Funding support | ![]()
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![]() | ![]() Title: High-resolution view of the type III secretion export apparatus in situ reveals membrane remodeling and a secretion pathway. Authors: Carmen Butan / Maria Lara-Tejero / Wenwei Li / Jun Liu / Jorge E Galán / ![]() Abstract: Type III protein secretion systems are essential virulence factors for many important pathogenic bacteria. The entire protein secretion machine is composed of several substructures that organize into ...Type III protein secretion systems are essential virulence factors for many important pathogenic bacteria. The entire protein secretion machine is composed of several substructures that organize into a holostructure or injectisome. The core component of the injectisome is the needle complex, which houses the export apparatus that serves as a gate for the passage of the secreted proteins through the bacterial inner membrane. Here, we describe a high-resolution structure of the export apparatus of the type III secretion system in association with the needle complex and the underlying bacterial membrane, both in isolation and in situ. We show the precise location of the core export apparatus components within the injectisome and bacterial envelope and demonstrate that their deployment results in major membrane remodeling and thinning, which may be central for the protein translocation process. We also show that InvA, a critical export apparatus component, forms a multiring cytoplasmic conduit that provides a pathway for the type III secretion substrates to reach the entrance of the export gate. Combined with structure-guided mutagenesis, our studies provide major insight into potential mechanisms of protein translocation and injectisome assembly. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 78.5 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 11.3 KB 11.3 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 9.9 KB | Display | ![]() |
Images | ![]() | 288.1 KB | ||
Filedesc metadata | ![]() | 5.2 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 6uotMC ![]() 6uovC M: atomic model generated by this map C: citing same article ( |
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Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Annotation | primary map | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.32 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
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Sample components
-Entire : Complex of the periplasmic domains of PrgH and PrgK from the Salm...
Entire | Name: Complex of the periplasmic domains of PrgH and PrgK from the Salmonella SPI-1 type III secretion needle complex |
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Components |
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-Supramolecule #1: Complex of the periplasmic domains of PrgH and PrgK from the Salm...
Supramolecule | Name: Complex of the periplasmic domains of PrgH and PrgK from the Salmonella SPI-1 type III secretion needle complex type: complex / ID: 1 / Parent: 0 / Macromolecule list: all |
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Source (natural) | Organism: ![]() |
-Macromolecule #1: Protein PrgH
Macromolecule | Name: Protein PrgH / type: protein_or_peptide / ID: 1 / Number of copies: 24 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 44.509367 KDa |
Sequence | String: METSKEKTIT SPGPYIVRLL NSSLNGCEFP LLTGRTLFVV GQSDALTASG QLPDIPADSF FIPLDHGGVN FEIQVDTDAT EIILHELKE GNSESRSVQL NTPIQVGELL ILIRPESEPW VPEQPEKLET SAKKNEPRFK NGIVAALAGF FILGIGTVGT L WILNSPQR ...String: METSKEKTIT SPGPYIVRLL NSSLNGCEFP LLTGRTLFVV GQSDALTASG QLPDIPADSF FIPLDHGGVN FEIQVDTDAT EIILHELKE GNSESRSVQL NTPIQVGELL ILIRPESEPW VPEQPEKLET SAKKNEPRFK NGIVAALAGF FILGIGTVGT L WILNSPQR QAAELDSLLG QEKERFQVLP GRDKMLYVAA QNERDTLWAR QVLARGDYDK NARVINENEE NKRISIWLDT YY PQLAYYR IHFDEPRKPV FWLSRQRNTM SKKELEVLSQ KLRALMPYAD SVNITLMDDV TAAGQAEAGL KQQALPYSRR NHK GGVTFV IQGALDDVEI LRARQFVDSY YRTWGGRYVQ FAIELKDDWL KGRSFQYGAE GYIKMSPGHW YFPSPL UniProtKB: Protein PrgH |
-Macromolecule #2: Lipoprotein PrgK
Macromolecule | Name: Lipoprotein PrgK / type: protein_or_peptide / ID: 2 / Number of copies: 24 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 28.245287 KDa |
Sequence | String: MIRRYLYTFL LVMTLAGCKD KDLLKGLDQE QANEVIAVLQ MHNIEANKID SGKLGYSITV AEPDFTAAVY WIKTYQLPPR PRVEIAQMF PADSLVSSPR AEKARLYSAI EQRLEQSLQT MEGVLSARVH ISYDIDAGEN GRPPKPVHLS ALAVYERGSP L AHQISDIK ...String: MIRRYLYTFL LVMTLAGCKD KDLLKGLDQE QANEVIAVLQ MHNIEANKID SGKLGYSITV AEPDFTAAVY WIKTYQLPPR PRVEIAQMF PADSLVSSPR AEKARLYSAI EQRLEQSLQT MEGVLSARVH ISYDIDAGEN GRPPKPVHLS ALAVYERGSP L AHQISDIK RFLKNSFADV DYDNISVVLS ERSDAQLQAP GTPVKRNSFA TSWIVLIILL SVMSAGFGVW YYKNHYARNK KG ITADDKA KSSNE UniProtKB: Lipoprotein PrgK |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.5 |
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Vitrification | Cryogen name: ETHANE / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 48.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |