Calcium-binding proteins in fungi and higher plants.

摘要: Calcium has long been known to be required for many vital processes in fungi and plants. High levels of calcium are found cell walls, vacuoles, most organelles. In contrast, very low present the cytosol fungal plant cells. The recent evidence indicates that is a true second messenger Because cyclic AMP does not appear plants, only messenger. Calcium-binding proteins involved events accompany action as messenger; three types have identified first group includes several bind 45 Ca2+ any enzymatic activity. A type enzymes from plants stimulated by millimolar calcium. third calcium-binding protein, calmodulin, responds micromolar binding certain stimulating them. Calmodulin detected every eukaryote thus far examined. amino acid composition calmodulins elucidated similar calmodulin animals. Eight reported regulated either directly or indirectly calmodulin. antagonists used study possible involvement cellular plants.(ABSTRACT TRUNCATED AT 250 WORDS)