"**mxbD/MxbD** consistently refers to the **sensor histidine kinase component** of the **MxbDM** two-component regulatory system involved in regulating methanol oxidation gene expression in AM1, with **MxbM** as the cognate response regulator"

"**MxbDM** (MxbD sensor kinase + MxbM response regulator) and **MxcQE** (MxcQ sensor kinase + MxcE response regulator), together with the orphan response regulator **MxaB**, form a regulatory network controlling expression of methanol dehydrogenase systems"

"the response regulator **MxbM** is described as **required for expression of the mxa operon**, alongside MxcQE and MxaB"

"the **MxbDM two-component system is required for repression of the xox1 operon in the absence of lanthanides**; the Skovran review further emphasizes that **MxbM is uniquely required for repression of xox1** in the described network"

"**MxbD/MxbM** is best supported as a **regulatory (signaling) module**, not a metabolic enzyme: it is a two-component system required for proper expression and reciprocal control of methanol dehydrogenase gene clusters"

"it is not known if the requirement for these regulators is direct or indirect or what is being sensed by these systems"

"neither the phosphorylation state nor direct DNA binding by these response regulators has been shown"

"it is expected to function at the **cell envelope–cytosol signaling interface**, but **experimental validation of membrane topology/localization in AM1 is lacking** in the evidence retrieved here"

"The authors fused the **“methanol-sensing domain” of MxbD** (from *M. extorquens*) with the transmitter domain of *E. coli* EnvZ to create a chimeric histidine kinase (MxbDZ)"