Abstract
A cDNA, BCA1, encoding a calmodulin-stimulated Ca 2+-ATPase in the vacuolar membrane of cauliflower ( Brassica oleracea) was isolated based on the sequence of tryptic peptides derived from the purified protein. The BCA1 cDNA shares sequence identity with animal plasma membrane Ca 2+-ATPases and Arabidopsis thaliana ACA1, that encodes a putative Ca 2+ pump in the chloroplast envelope. In contrast to the plasma membrane Ca 2+-ATPases of animal cells, which have a calmodulin-binding domain situated in the carboxy-terminal end of the molecule, the calmodulin-binding domain of BCA1 is situated at the amino terminus of the enzyme.
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