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TitleIn situ structural analysis of the human nuclear pore complex.
Journal, issue, pagesNature, Vol. 526, Issue 7571, Page 140-143, Year 2015
Publish dateOct 1, 2015
AuthorsAlexander von Appen / Jan Kosinski / Lenore Sparks / Alessandro Ori / Amanda L DiGuilio / Benjamin Vollmer / Marie-Therese Mackmull / Niccolo Banterle / Luca Parca / Panagiotis Kastritis / Katarzyna Buczak / Shyamal Mosalaganti / Wim Hagen / Amparo Andres-Pons / Edward A Lemke / Peer Bork / Wolfram Antonin / Joseph S Glavy / Khanh Huy Bui / Martin Beck /
PubMed AbstractNuclear pore complexes are fundamental components of all eukaryotic cells that mediate nucleocytoplasmic exchange. Determining their 110-megadalton structure imposes a formidable challenge and ...Nuclear pore complexes are fundamental components of all eukaryotic cells that mediate nucleocytoplasmic exchange. Determining their 110-megadalton structure imposes a formidable challenge and requires in situ structural biology approaches. Of approximately 30 nucleoporins (Nups), 15 are structured and form the Y and inner-ring complexes. These two major scaffolding modules assemble in multiple copies into an eight-fold rotationally symmetric structure that fuses the inner and outer nuclear membranes to form a central channel of ~60 nm in diameter. The scaffold is decorated with transport-channel Nups that often contain phenylalanine-repeat sequences and mediate the interaction with cargo complexes. Although the architectural arrangement of parts of the Y complex has been elucidated, it is unclear how exactly it oligomerizes in situ. Here we combine cryo-electron tomography with mass spectrometry, biochemical analysis, perturbation experiments and structural modelling to generate, to our knowledge, the most comprehensive architectural model of the human nuclear pore complex to date. Our data suggest previously unknown protein interfaces across Y complexes and to inner-ring complex members. We show that the transport-channel Nup358 (also known as Ranbp2) has a previously unanticipated role in Y-complex oligomerization. Our findings blur the established boundaries between scaffold and transport-channel Nups. We conclude that, similar to coated vesicles, several copies of the same structural building block--although compositionally identical--engage in different local sets of interactions and conformations.
External linksNature / PubMed:26416747 / PubMed Central
MethodsEM (subtomogram averaging) / EM (tomography)
Resolution23.0 - 37.5 Å
Structure data

3103

5a9q

EMDB-3103: entire human nuclear pore complex
PDB-5a9q: Human nuclear pore complex
Method: EM (subtomogram averaging) / Resolution: 23.0 Å

EMDB-3104:
The human Nuclear Pore Complex with nucleoporin 358 knockdown
Method: EM (subtomogram averaging) / Resolution: 37.5 Å

EMDB-3105:
segment of the cytoplasmic ring of the human nuclear pore complex
Method: EM (subtomogram averaging) / Resolution: 23.4 Å

EMDB-3106:
segment of the inner ring of the human nuclear pore complex
Method: EM (subtomogram averaging) / Resolution: 23.0 Å

EMDB-3107:
segment of the nuclear ring of the human nuclear pore complex
Method: EM (subtomogram averaging) / Resolution: 24.1 Å

Source
  • homo sapiens (human)
KeywordsTRANSPORT PROTEIN

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