NUDIX_5 is found in higher eukaryotes at the N-terminus of KRIT1 or Krev interaction trapped proteins. NUDIX_5 carries three NPxY-like motifs, and it is found to bind the integrin cytoplasmic-associated protein 1 ICAP1. In the absence of KRIT1 ICAP1 binds via its C-terminal PH/PTB fold domain to the integrin beta-1 cytoplasmic tail. Binding of KRIT1 to ICAP1 via NUDIX_5 out-competes the binding of ICAP1 to integrin cytoplasmic tails such that ICAP1 is sequestered in the nucleus. Integrin activation is thus prevented [1].

1: Mechanism for KRIT1 release of ICAP1-mediated suppression of integrin activation. Liu W, Draheim KM, Zhang R, Calderwood DA, Boggon TJ; Mol Cell. 2013;49:719-729. PMID:23317506