Tsi6 inhibits the NADase activity of Tse6, an integral membrane toxin from Pseudomonas aeruginosa. The Tsi6 immunity protein adopts an all-alpha-helical fold that binds to a surface of Tse6 [1].

1: Diverse NADase effector families mediate interbacterial antagonism via the type VI secretion system. Tang JY, Bullen NP, Ahmad S, Whitney JC; J Biol Chem. 2018;293:1504-1514. PMID:29237732