Ascientist has discovered the means to block a chemical that directly provide cells with energy for cellular process which self substance is most likely to be inhibited by this discovery

The answer to this question is Adenosine triphosphate
Adenosine triphosphate definitely played the most important roles in intercellular energy transfer.  Adenosine triphosphate act as some sort of currency or payment that every organism must make in order to do a certain metabolic process in our body. (including the process that produce energy)