Stress response protein CsbD (CsbD)

Stress response protein CsbD is a small, highly conserved bacterial protein that plays a central role in the general stress response (GSR) of various Gram-positive bacteria, including Bacillus subtilis and Streptococcus agalactiae (Group B Streptococcus). In B. subtilis, its expression is strictly regulated by the alternative sigma factor Sigma-B (σB) in response to environmental challenges such as heat, acid, oxidative stress, and phosphate starvation [1, 8, 13]. Recent research has highlighted its significance in pathogenic bacteria, specifically identifying CsbD as a key factor for bile salt resistance in Group B Streptococcus, where it promotes the transcription of ABC transporters to efflux toxic bile salts and ensure survival in the host intestinal tract [2, 3, 5]. Given its role in bacterial fitness and colonization, CsbD is considered a potential therapeutic target for the development of novel anti-infectives aimed at disrupting bacterial stress adaptation and persistence [2, 5]. While its regulatory importance is well-documented, the exact molecular mechanism by which CsbD interacts with other cellular components to modulate gene expression is still being elucidated [13].

Other names

ywmGGeneral stress protein CsbDBile salt resistance response factor