1. The Maynard I. and Elaine Wishner Chair of Bio-organic Chemistry; Department of Biological Chemistry, Weizmann Institute of Science; Rehovot 76100 Israel
2. Department of Biotechnology and Food Engineering, and Institute of Catalysis Science and Technology; Technion-Israel Institute of Technology; Haifa 32000 Israel
3. Department of Molecular Microbiology and Biotechnology; Tel Aviv University; Ramat Aviv 69978 Israel