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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-7320 | |||||||||
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Title | Mtb RNAP Holo/RbpA/double fork DNA -closed clamp | |||||||||
![]() | primary map | |||||||||
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![]() | initiation / transcription bubble / closed clamp / TRANSCRIPTION / transcription-dna complex | |||||||||
Function / homology | ![]() bacterial-type RNA polymerase holo enzyme binding / response to water / Antimicrobial action and antimicrobial resistance in Mtb / bacterial-type RNA polymerase core enzyme binding / sigma factor activity / DNA-directed RNA polymerase complex / peptidoglycan-based cell wall / DNA-templated transcription initiation / ribonucleoside binding / DNA-directed 5'-3' RNA polymerase activity ...bacterial-type RNA polymerase holo enzyme binding / response to water / Antimicrobial action and antimicrobial resistance in Mtb / bacterial-type RNA polymerase core enzyme binding / sigma factor activity / DNA-directed RNA polymerase complex / peptidoglycan-based cell wall / DNA-templated transcription initiation / ribonucleoside binding / DNA-directed 5'-3' RNA polymerase activity / DNA-directed RNA polymerase / nucleic acid binding / protein dimerization activity / response to antibiotic / DNA-templated transcription / positive regulation of DNA-templated transcription / magnesium ion binding / DNA binding / zinc ion binding / plasma membrane / cytoplasm / cytosol Similarity search - Function | |||||||||
Biological species | ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.27 Å | |||||||||
![]() | Darst SA / Campbell EA | |||||||||
![]() | ![]() Title: Fidaxomicin jams RNA polymerase motions needed for initiation via RbpA contacts. Authors: Hande Boyaci / James Chen / Mirjana Lilic / Margaret Palka / Rachel Anne Mooney / Robert Landick / Seth A Darst / Elizabeth A Campbell / ![]() Abstract: Fidaxomicin (Fdx) is an antimicrobial RNA polymerase (RNAP) inhibitor highly effective against RNAP in vitro, but clinical use of Fdx is limited to treating intestinal infections due to poor ...Fidaxomicin (Fdx) is an antimicrobial RNA polymerase (RNAP) inhibitor highly effective against RNAP in vitro, but clinical use of Fdx is limited to treating intestinal infections due to poor absorption. To identify the structural determinants of Fdx binding to RNAP, we determined the 3.4 Å cryo-electron microscopy structure of a complete RNAP holoenzyme in complex with Fdx. We find that the actinobacteria general transcription factor RbpA contacts fidaxomycin, explaining its strong effect on . Additional structures define conformational states of RNAP between the free apo-holoenzyme and the promoter-engaged open complex ready for transcription. The results establish that Fdx acts like a doorstop to jam the enzyme in an open state, preventing the motions necessary to secure promoter DNA in the active site. Our results provide a structural platform to guide development of anti-tuberculosis antimicrobials based on the Fdx binding pocket. #1: ![]() Title: Structure of Mycobacterium Tuberculosis RNAP Holo Enzyme/RbpA in closed clamp conformation Authors: Darst SA / Campbell EA / Boyaci Selcuk H / Chen J / Lilic M | |||||||||
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 | ![]() | 96.6 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 20.4 KB 20.4 KB | Display Display | ![]() |
Images | ![]() | 138.2 KB | ||
Filedesc metadata | ![]() | 7.9 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 6c04MC ![]() 7319C ![]() 7322C ![]() 7323C ![]() 6bzoC ![]() 6c05C ![]() 6c06C 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: 1.1 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 : Mtb RNAP Holo/RbpA/double fork DNA
+Supramolecule #1: Mtb RNAP Holo/RbpA/double fork DNA
+Macromolecule #1: DNA-directed RNA polymerase subunit alpha
+Macromolecule #2: DNA-directed RNA polymerase subunit beta
+Macromolecule #3: DNA-directed RNA polymerase subunit beta'
+Macromolecule #4: DNA-directed RNA polymerase subunit omega
+Macromolecule #5: RNA polymerase sigma factor SigA
+Macromolecule #6: RNA polymerase-binding protein RbpA
+Macromolecule #7: DNA (31-MER)
+Macromolecule #8: DNA (26-MER)
+Macromolecule #9: ZINC ION
+Macromolecule #10: MAGNESIUM ION
-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: 8 |
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Vitrification | Cryogen name: ETHANE |
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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: 6.7 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 |
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Image processing
Startup model | Type of model: INSILICO MODEL |
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Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 3.27 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 171547 |
Initial angle assignment | Type: ANGULAR RECONSTITUTION |
Final angle assignment | Type: PROJECTION MATCHING |