Part of the distal tail tip complex which plays a role in DNA injection during entry, and in tail assembly initiation during exit. The tail tip complex is assembled successively with three tail central fiber proteins J, one tail tip protein I, one tail tip protein L and one tail tip protein K. The tail tip complex interacts with tail measure protein to initiate tail tube assembly. The formation of the tail tip complex is completed by the addition of tail tip protein M, which is followed by tail tube polymerization. Binds 1 [4Fe-4S] cluster. The C-terminus coordinates an iron-sulfur cluster. Belongs to the lambda-like tail tip protein L family.