TM Dhameliya and AK Chakraborti thank the Department of Pharmaceuticals, New Delhi, India for financial assistance. AK Chakraborti thanks the Department of Atomic Energy, Mumbai, India for the Raja Ramanna Fellowship (1003/9/2020/RRF/R&D-II/13421). D Panda thanks the Council of Scientific & Industrial Research (CSIR), New Delhi, India (37/1797/19) for financial support. R Tiwari thanks University Grants Commission, New Delhi, India for a research fellowship. The ATP-phosphoribosyl transferase construct was a kind gift from Luiz PS de Carvalho from MRC National Institute for Medical Research, London, UK.