Structural and Functional Analysis of Nup120 Suggests Ring Formation of the Nup84 Complex

Journal Article · Thu Jan 01 04:00:00 EST 2009 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.0907453106· OSTI ID:980492

Seo, H; Ma, Y; Debler, E; Wacker, D; Kutik, S; Blobel, G; Hoelz, A

The Nup84 complex constitutes a key building block in the nuclear pore complex (NPC). Here we present the crystal structure of one of its 7 components, Nup120, which reveals a ? propeller and an ?-helical domain representing a novel fold. We discovered a previously unidentified interaction of Nup120 with Nup133 and confirmed the physiological relevance in vivo. As mapping of the individual components in the Nup84 complex places Nup120 and Nup133 at opposite ends of the heptamer, our findings indicate a head-to-tail arrangement of elongated Nup84 complexes into a ring structure, consistent with a fence-like coat for the nuclear pore membrane. The attachment site for Nup133 lies at the very end of an extended unstructured region, which allows for flexibility in the diameter of the Nup84 complex ring. These results illuminate important roles of terminal unstructured segments in nucleoporins for the architecture, function, and assembly of the NPC.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 980492
• Report Number(s): BNL--93410-2010-JA
• Journal Information: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Vol. 106
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ARCHITECTURE
BUILDINGS
COMPLEXES
CRYSTAL STRUCTURE
FLEXIBILITY
FUNCTIONAL ANALYSIS
IN VIVO
INTERACTIONS
MAPPING
RINGS
national synchrotron light source