Project description:U1 snRNP plays an essential role in initiating spliceosome assembly, yet the mechanism underlying its synergy with other splicing regulators for efficient spliceosome assembly remains elusive. Here we identify ZFP207 as a key regulator of U1 snRNP function that substantially promotes spliceosome assembly. Acute depletion of ZFP207 largely recapitulates the molecular phenotypes observed with the depletion of SNRNP70, a core component of U1 snRNP. Mechanistically, the N-terminal zinc finger domains of ZFP207 directly bind to U1 snRNA, while its C-terminus undergoes phase separation via intrinsically disordered regions (IDRs) to forms biomolecular condensates with U1 snRNP. These condensates create a crowded molecular environment that increases the local concentration of splicing snRNPs and regulators, thereby accelerating the speed of spliceosome assembly by facilitating interactions between U1 snRNP and other snRNPs. Collectively, our study demonstrates the critical role of phase separation in ensuring proper U1 snRNP function and efficient spliceosome assembly.
Project description:U1 snRNP plays an essential role in initiating spliceosome assembly, yet the mechanism underlying its synergy with other splicing regulators for efficient spliceosome assembly remains elusive. Here we identify ZFP207 as a key regulator of U1 snRNP function that substantially promotes spliceosome assembly. Acute depletion of ZFP207 results in a series of molecular phenotypes indicative of U1 snRNP dysregulation. Mechanistically, the N-terminal zinc finger domains of ZFP207 directly bind to the stem-loop 3 (SL3) of U1 snRNA, while its C-terminal intrinsically disordered regions (IDRs) undergo phase separation to form biomolecular condensates with U1 snRNP. These condensates create a crowded molecular environment that increases the local concentration of splicing snRNPs and regulators, thereby accelerating the speed of spliceosome assembly by facilitating interactions between U1 snRNP and other snRNPs. Collectively, our study demonstrates the critical role of phase separation in ensuring effective U1 snRNP function and promoting efficient spliceosome assembly.
Project description:U1 snRNP plays an essential role in initiating spliceosome assembly, yet the mechanism underlying its synergy with other splicing regulators for efficient spliceosome assembly remains elusive. Here we identify ZFP207 as a key regulator of U1 snRNP function that substantially promotes spliceosome assembly. Acute depletion of ZFP207 largely recapitulates the molecular phenotypes observed with the depletion of SNRNP70, a core component of U1 snRNP. Mechanistically, the N-terminal zinc finger domains of ZFP207 directly bind to U1 snRNA, while its C-terminus undergoes phase separation via intrinsically disordered regions (IDRs) to forms biomolecular condensates with U1 snRNP. These condensates create a crowded molecular environment that increases the local concentration of splicing snRNPs and regulators, thereby accelerating the speed of spliceosome assembly by facilitating interactions between U1 snRNP and other snRNPs. Collectively, our study demonstrates the critical role of phase separation in ensuring proper U1 snRNP function and efficient spliceosome assembly.
Project description:U1 snRNP plays an essential role in initiating spliceosome assembly, yet the mechanism underlying its synergy with other splicing regulators for efficient spliceosome assembly remains elusive. Here we identify ZFP207 as a key regulator of U1 snRNP function that substantially promotes spliceosome assembly. Acute depletion of ZFP207 recapitulates the molecular phenotypes observed with the depletion of SNRNP70, a core component of U1 snRNP. Mechanistically, the N-terminal zinc finger domains of ZFP207 directly bind to U1 snRNA, while its C-terminus undergoes phase separation via intrinsically disordered regions (IDRs). The coordination between the N-terminus and C-terminus of ZFP207 drives the formation of biomolecular condensate with U1 snRNP, which creates a molecular environment to promote spliceosome assembly by facilitating the interactions between U1 snRNP and other splicing regulators. Collectively, our study demonstrates the critical role of ZFP207-mediated phase separation in ensuring proper U1 snRNP function and spliceosome assembly.
Project description:U1 snRNP plays an essential role in initiating spliceosome assembly, yet the mechanism underlying its synergy with other splicing regulators for efficient spliceosome assembly remains elusive. Here we identify ZFP207 as a key regulator of U1 snRNP function that substantially promotes spliceosome assembly. Acute depletion of ZFP207 recapitulates the molecular phenotypes observed with the depletion of SNRNP70, a core component of U1 snRNP. Mechanistically, the N-terminal zinc finger domains of ZFP207 directly bind to U1 snRNA, while its C-terminus undergoes phase separation via intrinsically disordered regions (IDRs). The coordination between the N-terminus and C-terminus of ZFP207 drives the formation of biomolecular condensate with U1 snRNP, which creates a molecular environment to promote spliceosome assembly by facilitating the interactions between U1 snRNP and other splicing regulators. Collectively, our study demonstrates the critical role of ZFP207-mediated phase separation in ensuring proper U1 snRNP function and spliceosome assembly.
Project description:U1 snRNP plays an essential role in initiating spliceosome assembly, yet the mechanism underlying its synergy with other splicing regulators for efficient spliceosome assembly remains elusive. Here we identify ZFP207 as a key regulator of U1 snRNP function that substantially promotes spliceosome assembly. Acute depletion of ZFP207 recapitulates the molecular phenotypes observed with the depletion of SNRNP70, a core component of U1 snRNP. Mechanistically, the N-terminal zinc finger domains of ZFP207 directly bind to U1 snRNA, while its C-terminus undergoes phase separation via intrinsically disordered regions (IDRs). The coordination between the N-terminus and C-terminus of ZFP207 drives the formation of biomolecular condensate with U1 snRNP, which creates a molecular environment to promote spliceosome assembly by facilitating the interactions between U1 snRNP and other splicing regulators. Collectively, our study demonstrates the critical role of ZFP207-mediated phase separation in ensuring proper U1 snRNP function and spliceosome assembly.
Project description:U1 snRNP plays an essential role in initiating spliceosome assembly, yet the mechanism underlying its synergy with other splicing regulators for efficient spliceosome assembly remains elusive. Here we identify ZFP207 as a key regulator of U1 snRNP function that substantially promotes spliceosome assembly. Acute depletion of ZFP207 recapitulates the molecular phenotypes observed with the depletion of SNRNP70, a core component of U1 snRNP. Mechanistically, the N-terminal zinc finger domains of ZFP207 directly bind to U1 snRNA, while its C-terminus undergoes phase separation via intrinsically disordered regions (IDRs). The coordination between the N-terminus and C-terminus of ZFP207 drives the formation of biomolecular condensate with U1 snRNP, which creates a molecular environment to promote spliceosome assembly by facilitating the interactions between U1 snRNP and other splicing regulators. Collectively, our study demonstrates the critical role of ZFP207-mediated phase separation in ensuring proper U1 snRNP function and spliceosome assembly.
Project description:U1 snRNP plays an essential role in initiating spliceosome assembly, yet the mechanism underlying its synergy with other splicing regulators for efficient spliceosome assembly remains elusive. Here we identify ZFP207 as a key regulator of U1 snRNP function that substantially promotes spliceosome assembly. Acute depletion of ZFP207 recapitulates the molecular phenotypes observed with the depletion of SNRNP70, a core component of U1 snRNP. Mechanistically, the N-terminal zinc finger domains of ZFP207 directly bind to U1 snRNA, while its C-terminus undergoes phase separation via intrinsically disordered regions (IDRs). The coordination between the N-terminus and C-terminus of ZFP207 drives the formation of biomolecular condensate with U1 snRNP, which creates a molecular environment to promote spliceosome assembly by facilitating the interactions between U1 snRNP and other splicing regulators. Collectively, our study demonstrates the critical role of ZFP207-mediated phase separation in ensuring proper U1 snRNP function and spliceosome assembly.
Project description:U1 snRNP plays an essential role in initiating spliceosome assembly, yet the mechanism underlying its synergy with other splicing regulators for efficient spliceosome assembly remains elusive. Here we identify ZFP207 as a key regulator of U1 snRNP function that substantially promotes spliceosome assembly. Acute depletion of ZFP207 recapitulates the molecular phenotypes observed with the depletion of SNRNP70, a core component of U1 snRNP. Mechanistically, the N-terminal zinc finger domains of ZFP207 directly bind to U1 snRNA, while its C-terminus undergoes phase separation via intrinsically disordered regions (IDRs). The coordination between the N-terminus and C-terminus of ZFP207 drives the formation of biomolecular condensate with U1 snRNP, which creates a molecular environment to promote spliceosome assembly by facilitating the interactions between U1 snRNP and other splicing regulators. Collectively, our study demonstrates the critical role of ZFP207-mediated phase separation in ensuring proper U1 snRNP function and spliceosome assembly.