Fold: YefM-like [143119]
core: beta-alpha(2)-beta(2)-alpha; mixed beta-sheet, order:123, strands 1 and 2 are parallel; forms compact dimer with a single beta-sheet;
YefM-like [143121] (2) antitoxin component of the YefM/YoeB-like system; binds to the toxin component wia extra C-terminal tail, unstructured in the free state, but adopting a RelB-like conformation in the bound state