1. Molecular Biology Unit, National Institute of Nutrition, Indian Council of Medical Research, Jamai-Osmania PO, Hyderabad 500007, India, Laboratory of Molecular and Cellular Biology, CDFD, Hyderabad 500076, India, Laboratory of Structural Biology, CDFD, Hyderabad 500076, India, and Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500007, India