Figure 1.

Schematic representation of the main monovalent channels and transporters in yeast and plant cells. (A) In a yeast cell, channels and transporters are present in almost all the organelles and cellular compartments. The introduction of positively charged ions and the expulsion of the negative ones maintains the negative plasma membrane potential. All the ion transporter proteins cited in the main text are represented. Inward/outward ion traffic is represented by arrows. (B) A schematic representation of a plant cell (without the cell wall). The KAT1 channel is represented in the known forms of homo-tetramer and hetero-tetramers with KAT2. All the transporters and channels cited in the text are represented. Organelle size is not to scale.