7FJJ

human Pol III pre-termination complex

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.60 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 insights into RNA polymerase III-mediated transcription termination through trapping poly-deoxythymidine.

Hou, H., Li, Y., Wang, M., Liu, A., Yu, Z., Chen, K., Zhao, D., Xu, Y.

(2021) Nat Commun 12: 6135-6135

  • DOI: 10.1038/s41467-021-26402-9
  • Primary Citation of Related Structures:  
    7FJI, 7FJJ

  • PubMed Abstract: 

    • Termination of the RNA polymerase III (Pol III)-mediated transcription requires the conversion of an elongation complex (EC) to a pre-termination complex (PTC) on poly-deoxythymidine (dT)-containing non-template strand, a mechanism distinct from Pol I and Pol II ...

    Termination of the RNA polymerase III (Pol III)-mediated transcription requires the conversion of an elongation complex (EC) to a pre-termination complex (PTC) on poly-deoxythymidine (dT)-containing non-template strand, a mechanism distinct from Pol I and Pol II. Here, our in vitro transcription elongation assay showed that 5-7 dT-containing DNA template led to transcription termination of Pol III, but not Pol I or Pol II. We assembled human Pol III PTC on a 7 dT-containing DNA template and determined the structure at 3.6 Å resolution. The structure reveals that poly-dT are trapped in a narrow exit tunnel formed by RPC2. A hydrophobic gate of the exit tunnel separates the bases of two connected deoxythymidines and may prevent translocation of the non-template strand. The fork loop 2 stabilizes both template and non-template strands around the transcription fork, and may further prevent strand translocation. Our study shows that the Pol III-specific exit tunnel and FL2 allow for efficient translocation of non-poly-dT sequence during transcription elongation but trap poly-dT to promote DNA retention of Pol III, revealing molecular mechanism of poly-dT-dependent transcription termination of Pol III.

    Organizational Affiliation: 

    State Key Laboratory of Reproductive Regulation and Breeding of Grassland Livestock School of Life Sciences, Inner Mongolia University, Hohhot, 010070, P. R. China. xuyh@fudan.edu.cn.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC1A1,390Homo sapiensMutation(s): 0 
Gene Names: POLR3A
EC: 2.7.7.6
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC2B1,133Homo sapiensMutation(s): 0 
Gene Names: POLR3B
EC: 2.7.7.6
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I and III subunit RPAC1C346Homo sapiensMutation(s): 0 
Gene Names: POLR1C, POLR1E
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC9D148Homo sapiensMutation(s): 0 
Gene Names: CRCP
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC1E210Homo sapiensMutation(s): 0 
Gene Names: POLR2E
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC2F127Homo sapiensMutation(s): 0 
Gene Names: POLR2F, POLRF
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC8G204Homo sapiensMutation(s): 0 
Gene Names: POLR3H, KIAA1665, RPC8
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Entity ID: 8
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC3H150Homo sapiensMutation(s): 0 
Gene Names: POLR2H
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Entity ID: 9
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC10I108Homo sapiensMutation(s): 1 
Gene Names: POLR3K, RPC11, My010
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Entity ID: 10
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DNA-directed RNA polymerases I, II, and III subunit RPABC5J67Homo sapiensMutation(s): 0 
Gene Names: POLR2L
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Entity ID: 11
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I and III subunit RPAC2K133Homo sapiensMutation(s): 0 
Gene Names: POLR1D
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Entity ID: 12
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC4L58Homo sapiensMutation(s): 0 
Gene Names: POLR2K
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Entity ID: 13
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DNA-directed RNA polymerase III subunit RPC5M708Homo sapiensMutation(s): 0 
Gene Names: POLR3E, KIAA1452
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Entity ID: 14
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DNA-directed RNA polymerase III subunit RPC4N398Homo sapiensMutation(s): 0 
Gene Names: POLR3D, BN51, BN51T
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Entity ID: 15
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC3O534Homo sapiensMutation(s): 0 
Gene Names: POLR3C
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Entity ID: 16
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC6P316Homo sapiensMutation(s): 0 
Gene Names: POLR3F
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Entity ID: 17
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC7Q223Homo sapiensMutation(s): 0 
Gene Names: POLR3G
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Entity ID: 18
MoleculeChainsLengthOrganismImage
RNA (5'-R(*CP*CP*GP*GP*GP*UP*GP*CP*UP*G)-3')R10Homo sapiens
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Entity ID: 19
MoleculeChainsLengthOrganismImage
non-template DNAS [auth X]54Homo sapiens
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Entity ID: 20
MoleculeChainsLengthOrganismImage
template DNAT [auth Y]54Homo sapiens
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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View more in-depth experimental data
Entry History & Funding Information

Deposition Data

  • Released Date: 2021-10-27 
    • Deposition Author(s): Hou, H., Xu, Y.
Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China31821002

Revision History  (Full details and data files)

  • Version 1.0: 2021-10-27
    Type: Initial release
  • Version 1.1: 2021-11-10
    Changes: Database references