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Structural basis for the RNA binding properties of mouse IGF2BP3.

Xiaojia Li1, Wenting Guo2, Yan Wen3

  • 1Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Guangdong-Hong Kong Joint Laboratory for RNA Medicine, Medical Research Center, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou 510120, China; Department of Reproductive Medicine, Department of Obstetrics and Gynecology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou 510080, China; Department of Obstetrics and Gynecology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou 510120, China.

Structure (London, England : 1993)
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Researchers uncovered how Insulin-like Growth Factor 2 Binding Protein 3 (IGF2BP3) binds to RNA. Structural studies reveal specific RNA-binding domains (RBDs) and modes, offering insights into gene regulation.

Keywords:
IGF2BP3KH domainRRM domaincomplexstructure

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Gene Regulation

Background:

  • Insulin-like Growth Factor 2 Binding Proteins (IGF2BPs) are crucial regulators of gene expression.
  • These proteins possess complex RNA-binding properties due to multiple RNA-binding domains (RBDs).
  • Understanding IGFBP-RNA interactions is key to deciphering their regulatory functions.

Purpose of the Study:

  • To elucidate the structural mechanisms by which IGF2BP3 recognizes specific RNA targets.
  • To provide detailed insights into the RNA-binding modes of IGF2BP3 domains.
  • To compare RNA-binding properties across different IGF2BP3 domains.

Main Methods:

  • Determination of crystal structures of mouse IGF2BP3 constructs bound to various RNA substrates.
  • Biochemical assays to validate RNA-binding interactions.
  • Comparative analysis of RNA-binding domain (RBD) characteristics.

Main Results:

  • IGF2BP3's RRM12 domains recognize CA-rich elements (up to 5 nucleotides) primarily via RRM1.
  • The KH12 domains exhibit an antiparallel RNA-binding mode, with KH1 binding five nucleotides and KH2 binding two.
  • Evidence suggests IGF2BP3-KH12 domains can recognize the "zipcode" RNA element in β-actin mRNA.

Conclusions:

  • Structural and biochemical data reveal specific RNA recognition strategies employed by IGF2BP3.
  • The findings highlight distinct RNA-binding capabilities of IGF2BP3's RRM and KH domains.
  • This study provides critical structural insights into IGF2BP3-mediated RNA target recognition.