The amino acid sequence previously attributed to a protein kinase or a TCP1‐related molecular chaperone and co‐purified with phytochrome is a β‐glucosidase

Abstract
A 60 kDa protein (P60) co‐purified with phytochrome was identified as avenacosidase, a β‐glucosidase which is part of the defense system of Avena sativa. An antiserum raised against P60 was used to isolate a cDNA clone coding for the complete amino acid sequence of P60. The cDNA‐derived amino acid sequence contained the partial sequences described before for a protein kinase [(1989) Planta 178, 199–206] and for a TCP1‐related molecular chaperone [(1993) Nature 363, 644–647] co‐purified with phytochrome. We conclude that these activities were related to minor contaminants and that only sequences of avenacosidase had been obtained.