5VQI

Nuclear transport of the Neurospora crassa NIT2 transcription factor is mediated by Importin-alpha


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.183 

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This is version 1.3 of the entry. See complete history


Literature

Nuclear transport of the Neurospora crassa NIT-2 transcription factor is mediated by importin-alpha.

Bernardes, N.E.Takeda, A.A.S.Dreyer, T.R.Cupertino, F.B.Virgilio, S.Pante, N.Bertolini, M.C.Fontes, M.R.M.

(2017) Biochem J 474: 4091-4104

  • DOI: 10.1042/BCJ20170654
  • Primary Citation of Related Structures:  
    5VQI

  • PubMed Abstract: 
  • The Neurospora crassa NIT-2 transcription factor belongs to the GATA transcription factor family and plays a fundamental role in the regulation of nitrogen metabolism. Because NIT-2 acts by accessing DNA inside the nucleus, understanding the nuclear import process of NIT-2 is necessary to characterize its function ...

    The Neurospora crassa NIT-2 transcription factor belongs to the GATA transcription factor family and plays a fundamental role in the regulation of nitrogen metabolism. Because NIT-2 acts by accessing DNA inside the nucleus, understanding the nuclear import process of NIT-2 is necessary to characterize its function. Thus, in the present study, NIT-2 nuclear transport was investigated using a combination of biochemical, cellular, and biophysical methods. A complemented strain that produced an sfGFP-NIT-2 fusion protein was constructed, and nuclear localization assessments were made under conditions that favored protein translocation to the nucleus. Nuclear translocation was also investigated using HeLa cells, which showed that the putative NIT-2 nuclear localization sequence (NLS; 915 TISSKRQRRHSKS 927 ) was recognized by importin-α and that subsequent transport occurred via the classical import pathway. The interaction between the N. crassa importin-α (NcImpα) and the NIT-2 NLS was quantified with calorimetric assays, leading to the observation that the peptide bound to two sites with different affinities, which is typical of a monopartite NLS sequence. The crystal structure of the NcImpα/NIT-2 NLS complex was solved and revealed that the NIT-2 peptide binds to NcImpα with the major NLS-binding site playing a primary role. This result contrasts other recent studies that suggested a major role for the minor NLS-binding site in importin-α from the α2 family, indicating that both sites can be used for different cargo proteins according to specific metabolic requirements.


    Organizational Affiliation

    Departamento de Física e Biofísica, Instituto de Biociências, Universidade Estadual Paulista (UNESP), Botucatu, São Paulo, Brazil.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Importin subunit alphaA [auth B]495Neurospora crassaMutation(s): 0 
Gene Names: 3H10.030GE21DRAFT_7666
UniProt
Find proteins for Q9C2K9 (Neurospora crassa)
Explore Q9C2K9 
Go to UniProtKB:  Q9C2K9
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Nuclear localization sequence of NIT2 transcription factor (NIT2-NLS)B [auth A], C13Neurospora crassaMutation(s): 0 
UniProt
Find proteins for P19212 (Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987))
Explore P19212 
Go to UniProtKB:  P19212
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.183 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.034α = 90
b = 63.706β = 90
c = 183.635γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
MxCuBEdata collection
HKL-2000data processing
Cootmodel building
HKL-2000data reduction

Structure Validation

View Full Validation Report




Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Sao Paulo Research Foundation (FAPESP)Brazil2014/10289-0

Revision History  (Full details and data files)

  • Version 1.0: 2017-11-01
    Type: Initial release
  • Version 1.1: 2017-12-20
    Changes: Database references
  • Version 1.2: 2019-04-17
    Changes: Author supporting evidence, Data collection
  • Version 1.3: 2020-01-01
    Changes: Author supporting evidence