Catalyzes the GTP-dependent phosphorylation of the 3'-hydroxyl group of dephosphocoenzyme A to form coenzyme A (CoA). Can also use UTP, with lower efficiency and has weak activity with ATP, but shows a strong preference for GTP as the phosphate donor. 3'-dephospho-CoA + GTP = CoA + GDP + H(+) kcat is 5.57 sec(-1). Optimum pH is 8.0. Optimum temperature is 80 degrees Celsius. Cofactor biosynthesis; coenzyme A biosynthesis. Monomer in solution. Disruption of the gene results in CoA auxotrophy. Belongs to the GTP-dependent DPCK family.