9W4R

Cryo-EM structure of hTUT4_mini:hLin28A:pre-let-7g miRNA_UUU, conformation 1

Summary for 9W4R

• Entry DOI: 10.2210/pdb9w4r/pdb
• Related: 9W4S
• EMDB information: 65642
• Descriptor: Terminal uridylyltransferase 4, Protein lin-28 homolog A, pre-let-7g miRNA, ... (4 entities in total)
• Functional Keywords: complex, tutase, transferase
• Biological source: Homo sapiens (human); More
• Total number of polymer chains: 3
• Total formula weight: 178218.25

Authors

Han, X.,Yamashita, S.,Tomita, K. (deposition date: 2025-08-01, release date: 2025-12-03, Last modification date: 2026-01-28)

Primary citation

Han, X.,Yamashita, S.,Tomita, K.
Mechanistic insights into Lin28-dependent oligo-uridylylation of pre-let-7 by TUT4.
Nucleic Acids Res., 54:-, 2026

PubMed Abstract: Lin28-dependent oligo-uridylylation of precursor let-7 (pre-let-7) by terminal uridylyltransferases 4 and 7 (TUT4/7) represses let-7 expression by blocking Dicer processing, thereby regulating cell differentiation and proliferation. The interaction between the Lin28:pre-let-7 complex and the N-terminal Lin28-interacting module (LIM) of TUT4/7 is required for pre-let-7 oligo-uridylylation by the C-terminal catalytic module (CM). Here, we report the cryogenic electron microscopy structure of human TUT4 complexed with Lin28A and oligo-uridylated pre-let-7, representing the elongation stage of oligo-uridylylation. Structural and biochemical analyses suggest that, after recruitment of pre-let-7 to the LIM through interactions between its terminal stem-loop and Lin28A, the CM associates with the LIM through protein-protein interactions. The double-stranded stem region of pre-let-7 is surrounded by the CM and LIM, the upper portion of the duplex unwinds, and the 3' end of pre-let-7 is positioned in the CM catalytic site for the initiation of oligo-uridylylation. At the oligo-uridylylation stage, the CM finger domain clamps the double-stranded region of pre-let-7, thereby further stabilizing the pre-let-7:TUT4 complex, enabling processive elongation of the uridine tail by the CM. Thus, the LIM functions as a stable anchor, working together with Lin28A to ensure efficient and processive oligo-uridylylation of pre-let-7.

PubMed: 41521656
DOI: 10.1093/nar/gkaf1421

Experimental method

ELECTRON MICROSCOPY (3.78 Å)