1. Department of Biomedical and Biotechnological Sciences, Microbiology Section, University of Catania, I‑95123, Italy
2. Department of Biomedical and Biotechnological Sciences, Biochemistry Section, University of Catania, I‑95123, Italy
3. Department of Drug Science, Biochemistry Section, University of Catania, I‑95125 Catania, Italy
4. Istituto di Chimica Biomolecolare del CNR, I‑95126 Catania, Italy