Figure 3. Structure of Danio rerio TRIM71 NHL domain bound to RNA.
A. The positively-charged cavity on the top surface of Dr Trim71 NHL domain (PDB: 6FPT) (Loedige et al., 2015) was visualized with APBS in PyMOL. Blue denotes positive charge, red denotes negative charge.
B. X-ray crystal structure of the Dr Trim71 NHL domain in complex with the RNA-binding site from the 3’UTR of the mab-10 mRNA (PDB: 6FQL) (Kumari et al., 2018). The RNA stem loop binding site sits within an indentation on the Trim71 NHL domain. Nucleotides that are important for RNA-binding specificity are highlighted in color.
C. The LIN-41 consensus binding motif consists of a short stem with a three nucleotide loop. Specific nucleotides in the loop (position III) and stem (positions −1 &+1) are preferred by LIN-41 and TRIM71 orthologs.