5XNX

Crystallographic structure of the enzymatically active N-terminal domain of the Rel protein from Mycobacterium tuberculosis

Summary for 5XNX

• Entry DOI: 10.2210/pdb5xnx/pdb
• Descriptor: Bifunctional (p)ppGpp synthase/hydrolase RelA, MAGNESIUM ION (2 entities in total)
• Functional Keywords: rela, mycobacterium tuberculosis, hd domain, hydrolase, helix bundle, synthetase domain, (p)ppgpp, stringent response, transferase
• Biological source: Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)
• Total number of polymer chains: 4
• Total formula weight: 178677.67

Authors

Singal, B.,Balakrishna, A.M.,Manimekalai, M.S.S.,Nartey, W.,Gruber, G. (deposition date: 2017-05-24, release date: 2017-07-19, Last modification date: 2023-11-22)

Primary citation

Singal, B.,Balakrishna, A.M.,Nartey, W.,Manimekalai, M.S.S.,Jeyakanthan, J.,Gruber, G.
Crystallographic and solution structure of the N-terminal domain of the Rel protein from Mycobacterium tuberculosis
FEBS Lett., 591:2323-2337, 2017

PubMed Abstract: Modulation of intracellular guanosine 3',5'-bispyrophosphate ((p)ppGpp) level, the effector of the stringent response, is crucial for survival as well as optimal growth of prokaryotes and, thus, for bacterial pathogenesis and dormancy. In Mycobacterium tuberculosis (Mtb), (p)ppGpp synthesis and degradation are carried out by the bifunctional enzyme MtRel, which consists of 738 residues, including an N-terminal hydrolase- and synthetase-domain (N-terminal domain or NTD) and a C-terminus with a ribosome-binding site. Here, we present the first crystallographic structure of the enzymatically active MtRel NTD determined at 3.7 Å resolution. The structure provides insights into the residues of MtRel NTD responsible for nucleotide binding. Small-angle X-ray scattering experiments were performed to investigate the dimeric state of the MtRel NTD and possible substrate-dependent structural alterations.

PubMed: 28672070
DOI: 10.1002/1873-3468.12739

Experimental method

X-RAY DIFFRACTION (3.7 Å)