Periplasmic chitooligosaccharide-binding protein requires a three-domain organization for substrate translocation. - Ohnuma, Takayuki; Tsujii, Jun; Kataoka, Chikara; Yoshimoto, Teruki; Takeshita, Daijiro; Lampela, Outi; Juffer, André H.; Suginta, Wipa; Fukamizo, Tamo (Scientific Reports, 2023)