Journal
DEVELOPMENT
Volume 150, Issue 9, Pages -Publisher
COMPANY BIOLOGISTS LTD
DOI: 10.1242/dev.201705
Keywords
Intrinsically disordered proteins; RNA repression; CNOT complex; Network hub
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PUF RNA-binding proteins are conserved stem cell regulators that work together with intrinsically disordered proteins LST-1 and SYGL-1 to regulate self-renewal of Caenorhabditis elegans germline stem cells. This study investigates the molecular activities of LST-1-PUF and SYGL-1-PUF partnerships in nematode stem cells and confirms the importance of the LST-1-PUF partnership in repressing gene expression and forming an effector complex on PUF target RNAs.
PUF RNA-binding proteins are conserved stem cell regulators. Four PUF proteins govern self-renewal of Caenorhabditis elegans germline stem cells together with two intrinsically disordered proteins, LST-1 and SYGL-1. Based on yeast two-hybrid results, we previously proposed a composite self-renewal hub in the stem cell regulatory network, with eight PUF partnerships and extensive redundancy. Here, we investigate LST-1-PUF and SYGL-1-PUF partnerships and their molecular activities in their natural context - nematode stem cells. We confirm LST-1-PUF partnerships and their specificity to self-renewal PUFs by co-immunoprecipitation and show that an LST-1(AmBm) mutant defective for PUF-interacting motifs does not complex with PUFs in nematodes. LST-1(AmBm) is used to explore the in vivo functional significance of the LST-1-PUF partnership. Tethered LST-1 requires this partnership to repress expression of a reporter RNA, and LST-1 requires the partnership to co-immunoprecipitate with NTL-1/Not1 of the CCR4-NOT complex. We suggest that the partnership provides multiple molecular interactions that work together to form an effector complex on PUF target RNAs in vivo. Comparison of LST-1-PUF and Nanos-Pumilio reveals fundamental molecular differences, making LST-1-PUF a distinct paradigm for PUF partnerships.
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