Biosynthesis and characterization of gold nanoparticles produced by laccase from Paraconiothyrium variabile

► The study was focused on the use of laccase purified from a newly isolated ascomycete, Paraconiothyrium variabile, for synthesis of gold nanoparticles. ► Catalytic activity of the purified laccase is not responsible for production of nanostructures. ► The properties of produced nanoparticles were characterized using UV-Vis spectroscopy, transmission electron microscopy (TEM) and energy dispersive X-ray (EDX).