Amino Acid Sequence of a Novel Calmodulin from the Unicellular Alga Chlamydomonas

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Abstract
An amino acid sequence for a Chlamydomonas calmodulin has been elucidated with emphasis on the characterization of differences that are unique to Chlamydomonas and Dictyostelium calmodulin. While the concentration of calmodulin required for half-maximal activation of plant NAD kinase varies among vertebrate, higher plant, algal, and slime mold calmodulins, only calmodulins from the unicellular alga Chlamydomonas and the slime mold Dictyostelium show increased maximal activation of NAD kinase (Roberts, Burgess, Watterson 1984 Plant Physiol 75: 796-798; Marshak, Clarke, Roberts, Watterson 1984 Biochemistry 23: 2891-2899). The same preparations of calmodulin do not show major differences in phosphodiesterase or myosin light chain kinase activator activity.