7V5Y

Crystal structure of hexameric complex of Sa2YoeB-Sa2YefM toxin-antitoxin from Staphylococcus aureus

Summary for 7V5Y

• Entry DOI: 10.2210/pdb7v5y/pdb
• Descriptor: Antitoxin, Putative mRNA interferase YoeB (3 entities in total)
• Functional Keywords: toxin/antitoxin, antitoxin
• Biological source: Staphylococcus aureus (strain NCTC 8325 / PS 47); More
• Total number of polymer chains: 6
• Total formula weight: 60475.30

Authors

Xue, L.,Khan, M.H.,Yue, J. (deposition date: 2021-08-18, release date: 2021-12-15, Last modification date: 2023-11-29)

Primary citation

Xue, L.,Khan, M.H.,Yue, J.,Zhu, Z.,Niu, L.
The two paralogous copies of the YoeB-YefM toxin-antitoxin module in Staphylococcus aureus differ in DNA binding and recognition patterns.
J.Biol.Chem., 298:101457-101457, 2022

PubMed Abstract: Toxin-antitoxin (TA) systems are ubiquitous regulatory modules for bacterial growth and cell survival following stress. YefM-YoeB, the most prevalent type II TA system, is present in a variety of bacterial species. In Staphylococcus aureus, the YefM-YoeB system exists as two independent paralogous copies. Our previous research resolved crystal structures of the two oligomeric states (heterotetramer and heterohexamer-DNA ternary complex) of the first paralog as well as the molecular mechanism of transcriptional autoregulation of this module. However, structural details reflecting molecular diversity in both paralogs have been relatively unexplored. To understand the molecular mechanism of how SaYoeB and SaYefM regulate their own transcription and how each paralog functions independently, we solved a series of crystal structures of the SaYoeB-SaYefM. Our structural and biochemical data demonstrated that both paralogous copies adopt similar mechanisms of transcriptional autoregulation. In addition, structural analysis suggested that molecular diversity between the two paralogs might be reflected in the interaction profile of YefM and YoeB and the recognition pattern of promoter DNA by YefM. Interaction analysis revealed unique conformational and activating force effected by the interface between SaYoeB and SaYefM. In addition, the recognition pattern analysis demonstrated that residues Thr and Tyr of SaYefM specifically recognizes the flanking sequences (G and C) of the promoter DNA. Together, these results provide the structural insights into the molecular diversity and independent function of the paralogous copies of the YoeB-YefM TA system.

PubMed: 34861238
DOI: 10.1016/j.jbc.2021.101457

Experimental method

X-RAY DIFFRACTION (2.25 Å)