Active bacterial modification of the host environment through RNA polymerase II inhibition

Area of Science:

• Microbiology
• Molecular Biology
• Immunology

Background:

• Commensal bacteria coexist with hosts, unlike pathogens.
• Bacterial adaptation mechanisms in host niches are not fully understood.
• Host gene expression regulation is crucial for cellular function.

Purpose of the Study:

• To identify mechanisms of bacterial adaptation to host environments.
• To investigate how commensal bacteria modulate host gene expression.
• To explore the therapeutic potential of bacterial factors targeting host processes.

Main Methods:

• Investigated bacterial inhibition of RNA polymerase II (Pol II) phosphorylation.
• Utilized a loss-of-function mutant to identify the bacterial NlpD protein.
• Assessed NlpD's interaction with host Pol II complex components (RPB1, PAF1C).
• Evaluated therapeutic efficacy of recombinant NlpD in a urinary tract infection model.

Main Results:

• Identified NlpD as a bacterial inhibitor of host Pol II Ser2 phosphorylation.
• NlpD targets RPB1 and PAF1C, attenuating host gene expression.
• Recombinant NlpD reduced pathology and accelerated bacterial clearance in vivo.
• NlpD treatment attenuated Pol II-dependent gene expression in the infection model.

Conclusions:

• Commensal bacteria possess mechanisms to modulate host gene expression.
• Bacterial NlpD protein inhibits host Pol II, impacting mRNA elongation.
• NlpD demonstrates therapeutic potential for treating bacterial infections.