6LXG

NMR solution structure of regulatory ACT domain of the Mycobacterium tuberculosis Rel protein


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 21 
  • Selection Criteria: structures with the lowest energy 

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This is version 1.1 of the entry. See complete history


Literature

Atomic structure of, and valine binding to the regulatory ACT domain of the Mycobacterium tuberculosis Rel protein.

Shin, J.Singal, B.Sony Subramanian Manimekalai, M.Wei Chen, M.Ragunathan, P.Gruber, G.

(2021) FEBS J 288: 2377-2397

  • DOI: 10.1111/febs.15600
  • Primary Citation of Related Structures:  
    6LXG

  • PubMed Abstract: 
  • The stringent response, regulated by the bifunctional (p)ppGpp synthetase/hydrolase Rel in mycobacteria, is critical for long-term survival of the drug-tolerant dormant state of Mycobacterium tuberculosis. During amino acid starvation, MtRel senses a drop in amino acid concentration and synthesizes the messengers pppGpp and ppGpp, collectively called (p)ppGpp ...

    The stringent response, regulated by the bifunctional (p)ppGpp synthetase/hydrolase Rel in mycobacteria, is critical for long-term survival of the drug-tolerant dormant state of Mycobacterium tuberculosis. During amino acid starvation, MtRel senses a drop in amino acid concentration and synthesizes the messengers pppGpp and ppGpp, collectively called (p)ppGpp. Here, we investigate the role of the regulatory 'Aspartokinase, Chorismate mutase and TyrA' (ACT) domain in MtRel. Using NMR spectroscopy approaches, we report the high-resolution structure of dimeric MtRel ACT which selectively binds to valine out of all other branched-chain amino acids tested. A set of MtRel ACT mutants were generated to identify the residues required for maintaining the head-to-tail dimer. Through NMR titrations, we determined the crucial residues for binding of valine and show structural rearrangement of the MtRel ACT dimer in the presence of valine. This study suggests the direct involvement of amino acids in (p)ppGpp accumulation mediated by MtRel independent to interactions with stalled ribosomes. Database Structural data are available in the PDB database under the accession number 6LXG.


    Organizational Affiliation

    School of Biological Sciences, Nanyang Technological University, Singapore City, Singapore.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
GTP pyrophosphokinaseA, B90Mycobacterium tuberculosisMutation(s): 0 
Gene Names: relAERS007703_00026
EC: 2.7.6.5 (PDB Primary Data), 3.1.7.2 (UniProt)
UniProt
Find proteins for P9WHG9 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WHG9 
Go to UniProtKB:  P9WHG9
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 21 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 6LXG Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-11-04
    Type: Initial release
  • Version 1.1: 2021-04-21
    Changes: Database references