Citing novPTMenzy and related work:

Khater, S. and Mohanty, D., 2015. novPTMenzy: a database for enzymes involved in novel post-translational modifications. Database, 2015, p.bav039
Khater, S. and Mohanty, D., 2015. In silico identification of AMPylating enzymes and study of their divergent evolution. Scientific reports, 5
Khater, S. and Mohanty, D., 2014. Genome-wide search for eliminylating domains reveals novel function for BLES03-like proteins. Genome biology and evolution, 6(8), pp.2017-2033.