National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35GM147414
米国
National Science Foundation (NSF, United States)
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
T32GM008268
米国
引用
ジャーナル: Sci Adv / 年: 2025 タイトル: Molecular exaptation by the integrin αI domain. 著者: Jeremy A Hollis / Matthew C Chan / Harmit S Malik / Melody G Campbell / 要旨: Integrins bind ligands between their alpha (α) and beta (β) subunits and transmit signals through conformational changes. Early in chordate evolution, some α subunits acquired an "inserted" (I) ...Integrins bind ligands between their alpha (α) and beta (β) subunits and transmit signals through conformational changes. Early in chordate evolution, some α subunits acquired an "inserted" (I) domain that expanded integrin's ligand-binding repertoire but obstructed the ancestral ligand pocket, seemingly blocking conventional integrin activation. Here, we compare cryo-electron microscopy structures of apo and ligand-bound states of the I domain-containing αEβ integrin and the I domain-lacking αβ integrin to illuminate how the I domain intrinsically mimics an extrinsic ligand to preserve integrin function. We trace the I domain's evolutionary origin to an ancestral collagen-collagen interaction domain, identifying an ancient molecular exaptation that facilitated integrin activation immediately upon I domain insertion. Our analyses reveal the evolutionary and biochemical basis of expanded cellular communication in vertebrates.