期刊
NUCLEIC ACIDS RESEARCH
卷 50, 期 1, 页码 536-548出版社
OXFORD UNIV PRESS
DOI: 10.1093/nar/gkab1220
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资金
- National Institutes of Health [R01NS100788, R01NS114018]
- Intramural Research Program of the National Institutes of Health, National Institute of Environmental Health Sciences [1ZIA50165]
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [W-31-109-Eng38]
- National Institutes of Health, National Institute of Environmental Health Sciences [1ZIA50165]
In C. elegans, PUF proteins are involved in promoting germline stem cell self-renewal, with their functions relying on partnerships with proteins, particularly LST-1, to modulate mRNA regulation by FBF2. LST-1 contains two interaction sites with FBF-2, LST-1 A and B, which have distinct effects on FBF-2's RNA-binding affinity. The specific binding interactions between FBF-2 and LST-1 A and B, particularly in the N- and C-terminal regions, determine the impact on mRNA regulation, highlighting the functional diversity of FBF binding sites in LST-1.
In C. elegans, PUF proteins promote germline stem cell self-renewal. Their functions hinge on partnerships with two proteins that are redundantly required for stem cell maintenance. Here we focus on understanding how the essential partner protein, LST-1, modulates mRNA regulation by the PUF protein, FBF2. LST-1 contains two nonidentical sites of interaction with FBF-2, LST-1 A and B. Our crystal structures of complexes of FBF-2, LST-1 A, and RNA visualize how FBF-2 associates with LST-1 A versus LST-1 B. One commonality is that FBF-2 contacts the conserved lysine and leucine side chains in the KxxL motifs in LST-1 A and B. A key difference is that FBF-2 forms unique contacts with regions N- and C-terminal to the KxxL motif. Consequently, LST-1 A does not modulate the RNA-binding affinity of FBF-2, whereas LST-1 B decreases RNA-binding affinity of FBF-2. The N-terminal region of LST-1 B, which binds near the 5' end of RNA elements, is essential to modulate FBF-2 RNA-binding affinity, while the C-terminal residues of LST-1 B contribute strong binding affinity to FBF-2. We conclude that LST-1 has the potential to impact which mRNAs are regulated depending on the precise nature of engagement through its functionally distinct FBF binding sites.
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