N(6)-[(R)-lipoyl]-L-lysyl-[protein] + pyruvate + H(+) => N(6)-[(R)-S(8)-acetyldihydrolipoyl]-L-lysyl-[protein] + CO2
n(6)-[(r)-lipoyl]-l-lysyl-[protein] + pyruvate + h(+) => n(6)-[(r)-s(8)-acetyldihydrolipoyl]-l-lysyl-[protein] + co2