L-seryl-[pyruvate dehydrogenase E1 alpha subunit] + phosphate => O-phospho-L-seryl-[pyruvate dehydrogenase E1 alpha subunit] + H2O
l-seryl-[pyruvate dehydrogenase e1 alpha subunit] + phosphate => o-phospho-l-seryl-[pyruvate dehydrogenase e1 alpha subunit] + h2o
L-seryl-[pyruvate dehydrogenase E1 alpha subunit] + phosphate => O-phospho-L-seryl-[pyruvate dehydrogenase E1 alpha subunit] + H2O
l-seryl-[pyruvate dehydrogenase e1 alpha subunit] + phosphate => o-phospho-l-seryl-[pyruvate dehydrogenase e1 alpha subunit] + h2o