9t3l

Crystal structure of the Acl1 ankyrin repeat domain in complex with the second Rpl1 domain

spinqualitylabelsall models 9t3l, resolution 2.55Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9t3l is a 2 chain structure with sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.55Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed In eukaryotes, most newly synthesized ribosomal proteins (r-proteins) need to rapidly and safely get into the nucleus to reach their assembly site on pre-ribosomal particles. However, only for few r-proteins tailored support mechanisms involving so-called dedicated chaperones (DCs) could so far be revealed. Here, with the primary aim of identifying novel DCs, we performed TurboID-based proximity labelling with all 46 large subunit r-proteins of Saccharomyces cerevisiae, which unveiled the fungi-specific Acl1 and the conserved Bcl1 as candidate DCs of Rpl1. We show that the functionally cooperating Acl1 and Bcl1 both directly interact with Rpl1, form a trimeric Acl1-Rpl1-Bcl1 complex, and enable the nuclear import of Rpl1. Moreover, our crystal structure of the minimal Acl1-Rpl1 complex reveals how Acl1's ankyrin repeat domain shields a positively charged ribosomal RNA-binding surface of Rpl1. Our proximity labelling approach also permitted to establish novel interactions between four r-proteins and distinct importins and to illuminate r-protein neighbourhoods on successive pre-60S particles. Additionally, reciprocal proximity labelling with the known DCs indicates that almost all appear to be transiently associated with pre-ribosomal particles. Our study provides for the first time comprehensive insight into the physical proximities of large subunit r-proteins along their entire life cycle. Exploration of the proxiOME of large subunit ribosomal proteins reveals Acl1 and Bcl1 as cooperating dedicated chaperones of Rpl1.,Favre S, Pillet B, Burchert F, Siva Sankar D, Mendez-Godoy A, Kiontke S, Dengjel J, Bange G, Kressler D Nucleic Acids Res. 2026 Mar 19;54(6):gkag264. doi: 10.1093/nar/gkag264. PMID:41909949 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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