ABC-type transporter; part of the gene cluster that mediates the biosynthesis of cordycepin (COR) and pentostatin (PTN), two adenosine analogs with related bioactivity profiles as both mimic adenosine and can inhibit some of the processes that are adenosine dependent. Mediates the pumping of pentostatin but not of cordycepin out of fungal cells. Decreasing intracellular pentostatin releases adenosine deaminase (ADA) inhibition, allowing ADA to deaminate cordycepin into non-toxic 3'-d