3TNU

Heterocomplex of coil 2B domains of human intermediate filament proteins, keratin 5 (KRT5) and keratin 14 (KRT14)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.210 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural basis for heteromeric assembly and perinuclear organization of keratin filaments.

Lee, C.H.Kim, M.S.Chung, B.M.Leahy, D.J.Coulombe, P.A.

(2012) Nat Struct Mol Biol 19: 707-715

  • DOI: 10.1038/nsmb.2330
  • Primary Citation of Related Structures:  
    3TNU

  • PubMed Abstract: 
  • There is as yet no high-resolution data regarding the structure and organization of keratin intermediate filaments, which are obligate heteropolymers providing vital mechanical support in epithelia. We report the crystal structure of interacting 2B r ...

    There is as yet no high-resolution data regarding the structure and organization of keratin intermediate filaments, which are obligate heteropolymers providing vital mechanical support in epithelia. We report the crystal structure of interacting 2B regions from the central coiled-coil domains of keratins 5 and 14 (K5 and K14), expressed in progenitor keratinocytes of epidermis. The interface of the K5-K14 coiled-coil heterodimer has asymmetric salt bridges, hydrogen bonds and hydrophobic contacts, and its surface exhibits a notable charge polarization. A trans-dimer homotypic disulfide bond involving Cys367 in K14's stutter region occurs in the crystal and in skin keratinocytes, where it is concentrated in a keratin filament cage enveloping the nucleus. We show that K14-Cys367 impacts nuclear shape in cultured keratinocytes and that mouse epidermal keratinocytes lacking K14 show aberrations in nuclear structure, highlighting a new function for keratin filaments.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Keratin, type I cytoskeletal 14A131Homo sapiensMutation(s): 0 
Gene Names: KRT14
Find proteins for P02533 (Homo sapiens)
Explore P02533 
Go to UniProtKB:  P02533
NIH Common Fund Data Resources
PHAROS  P02533
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Keratin, type II cytoskeletal 5B129Homo sapiensMutation(s): 0 
Gene Names: KRT5
Find proteins for P13647 (Homo sapiens)
Explore P13647 
Go to UniProtKB:  P13647
NIH Common Fund Data Resources
PHAROS  P13647
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.210 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 150.991α = 90
b = 150.991β = 90
c = 141.623γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-06-20
    Type: Initial release
  • Version 1.1: 2012-08-01
    Changes: Database references