6ZT5

Complex between a homodimer of Mycobacterium smegmatis MfpA and a single copy of the N-terminal 47 kDa fragment of the Mycobacterium smegmatis DNA Gyrase B subunit


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.210 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

The pentapeptide-repeat protein, MfpA, interacts with mycobacterial DNA gyrase as a DNA T-segment mimic.

Feng, L.Mundy, J.E.A.Stevenson, C.E.M.Mitchenall, L.A.Lawson, D.M.Mi, K.Maxwell, A.

(2021) Proc Natl Acad Sci U S A 118

  • DOI: 10.1073/pnas.2016705118
  • Primary Citation of Related Structures:  
    6ZT3, 6ZT5, 6ZT4

  • PubMed Abstract: 
  • DNA gyrase, a type II topoisomerase, introduces negative supercoils into DNA using ATP hydrolysis. The highly effective gyrase-targeted drugs, fluoroquinolones (FQs), interrupt gyrase by stabilizing a DNA-cleavage complex, a transient intermediate in the supercoiling cycle, leading to double-stranded DNA breaks ...

    DNA gyrase, a type II topoisomerase, introduces negative supercoils into DNA using ATP hydrolysis. The highly effective gyrase-targeted drugs, fluoroquinolones (FQs), interrupt gyrase by stabilizing a DNA-cleavage complex, a transient intermediate in the supercoiling cycle, leading to double-stranded DNA breaks. MfpA, a pentapeptide-repeat protein in mycobacteria, protects gyrase from FQs, but its molecular mechanism remains unknown. Here, we show that Mycobacterium smegmatis MfpA (MsMfpA) inhibits negative supercoiling by M. smegmatis gyrase (Msgyrase) in the absence of FQs, while in their presence, MsMfpA decreases FQ-induced DNA cleavage, protecting the enzyme from these drugs. MsMfpA stimulates the ATPase activity of Msgyrase by directly interacting with the ATPase domain (MsGyrB47), which was confirmed through X-ray crystallography of the MsMfpA-MsGyrB47 complex, and mutational analysis, demonstrating that MsMfpA mimics a T (transported) DNA segment. These data reveal the molecular mechanism whereby MfpA modulates the activity of gyrase and may provide a general molecular basis for the action of other pentapeptide-repeat proteins.


    Organizational Affiliation

    Department of Biological Chemistry, John Innes Centre, NR4 7UH Norwich, United Kingdom; mik@im.ac.cn tony.maxwell@jic.ac.uk.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Pentapeptide repeat protein MfpAA, B192Mycolicibacterium smegmatis MC2 155Mutation(s): 0 
Gene Names: mfpAMSMEG_1641MSMEI_1602
UniProt
Find proteins for A0QSY0 (Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155))
Explore A0QSY0 
Go to UniProtKB:  A0QSY0
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
DNA gyrase subunit BC428Mycolicibacterium smegmatis MC2 155Mutation(s): 0 
Gene Names: gyrBMSMEG_0005MSMEI_0007
EC: 5.6.2.2
UniProt
Find proteins for A0QNE0 (Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155))
Explore A0QNE0 
Go to UniProtKB:  A0QNE0
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download Ideal Coordinates CCD File 
D [auth A], E [auth B], F [auth B]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.210 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 150.545α = 90
b = 59.38β = 119.71
c = 141.217γ = 90
Software Package:
Software NamePurpose
Aimlessdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
DIALSdata reduction
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Biotechnology and Biological Sciences Research Council (BBSRC)United KingdomCEPAMS
Wellcome TrustUnited Kingdom110072/Z/15/Z
Biotechnology and Biological Sciences Research Council (BBSRC)United KingdomBB/P012523/1
Ministry of Science and Technology (MoST, China)China2018YFC1603900
Ministry of Science and Technology (MoST, China)China2017YFA0505901
National Natural Science Foundation of China (NSFC)China31970136
National Natural Science Foundation of China (NSFC)China31670137

Revision History  (Full details and data files)

  • Version 1.0: 2021-03-03
    Type: Initial release
  • Version 1.1: 2021-04-21
    Changes: Database references