D-xylose-binding periplasmic protein (XylFII) (XylFII)

XylFII is a periplasmic D-xylose-binding protein that serves as a specialized sensor for environmental xylose in bacteria like Clostridium beijerinckii [1, 18]. It operates as part of a three-component system, interacting with the histidine kinase LytS and the response regulator YesN [1, 24]. The protein consists of two globular domains that bind D-xylose in a central cleft, triggering a transition from an open to a closed conformation [1, 2]. This conformational change promotes the formation of an active heterotetramer with LytS, initiating a signal transduction cascade [1, 18]. The resulting phosphorylation of YesN leads to the induction of the xylFGH operon, which encodes an ABC-type transporter for xylose uptake [1, 24]. XylFII is a primary target for metabolic engineering to enhance the efficiency of xylose fermentation in biofuel production [18, 24]. By modulating the sensing threshold of XylFII, researchers can improve the utilization of lignocellulosic biomass [1, 24]. There are currently no known drugs or therapeutic applications for XylFII in human medicine [1, 18]. Its function is strictly limited to bacterial carbohydrate sensing and metabolic regulation [1, 2]. Understanding its structural dynamics provides insights into how bacteria perceive and respond to nutrient availability in their environment [1, 18].

Other names

XylFIID-xylose-binding proteinXylF-like proteinXylF2D-xylose sensor protein

Not applicable; no drugs are known to target XylFII.