4NSX

Crystal Structure of the Utp21 tandem WD Domain

Summary for 4NSX

• Entry DOI: 10.2210/pdb4nsx/pdb
• Descriptor: U3 small nucleolar RNA-associated protein 21, CITRATE ANION (3 entities in total)
• Functional Keywords: ribosome biogenesis, utpb complex, 90s preribosome, small subunit processome, protein binding
• Biological source: Saccharomyces cerevisiae (Baker's yeast)
• Cellular location: Nucleus, nucleolus: Q06078
• Total number of polymer chains: 1
• Total formula weight: 76284.50

Authors

Zhang, C.,Ye, K. (deposition date: 2013-11-29, release date: 2014-02-19, Last modification date: 2024-03-20)

Primary citation

Zhang, C.,Lin, J.,Liu, W.,Chen, X.,Chen, R.,Ye, K.
Structure of Utp21 Tandem WD Domain Provides Insight into the Organization of the UTPB Complex Involved in Ribosome Synthesis
Plos One, 9:e86540-e86540, 2014

PubMed Abstract: Assembly of the eukaryotic ribosome requires a large number of trans-acting proteins and small nucleolar RNAs that transiently associate with the precursor rRNA to facilitate its modification, processing and binding with ribosomal proteins. UTPB is a large evolutionarily conserved complex in the 90S small subunit processome that mediates early processing of 18S rRNA. UTPB consists of six proteins Utp1/Pwp1, Utp6, Utp12/Dip2, Utp13, Utp18 and Utp21 and has abundant WD domains. Here, we determined the crystal structure of the tandem WD domain of yeast Utp21 at 2.1 Å resolution, revealing two open-clamshell-shaped β-propellers. The bottom faces of both WD domains harbor several conserved patches that potentially function as molecular binding sites. We show that residues 100-190 of Utp18 bind to the tandem WD domain of Utp21. Structural mapping of previous crosslinking data shows that the WD domains of Utp18 and Utp1 are organized on two opposite sides of the Utp21 WD domains. This study reports the first structure of a UTPB component and provides insight into the structural organization of the UTPB complex.

PubMed: 24466140
DOI: 10.1371/journal.pone.0086540

Experimental method

X-RAY DIFFRACTION (2.1 Å)