Cruciform DNA-binding protein which exerts an enhancing effect on the cleavage of cruciform DNA (X-DNA) by endonuclease VII from bacteriophage T4. Cleaved in the vicinity of position 160 to give an X-DNA-binding N-terminal subpeptide and a non-DNA-binding C-terminal subpeptide. Belongs to the CRP1/MDG1 family. Truncated N-terminus.