Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 12.35 kDa 
• Atom Count: 841 
• Residue Count: 110 
• Unique protein chains: 1

1BYW

STRUCTURE OF THE N-TERMINAL DOMAIN OF THE HUMAN-ERG POTASSIUM CHANNEL

• DOI: 10.2210/pdb1BYW/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 1998-10-15 Released: 1998-12-16 
• Deposition Author(s): Cabral, J.H.M., Lee, A., Mackinnon, R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.286 
• R-Value Work: 0.252 
• R-Value Observed: 0.252 

Literature

Crystal Structure and Functional Analysis of the Herg Potassium Channel N-Terminus: A Eukaryotic Pas Domain

Cabral, J.H.M., Lee, A., Cohen, S.L., Chait, B.T., Li, M., Mackinnon, R.

(1998) Cell 95: 649-655

• PubMed: 9845367 
• DOI: 10.1016/s0092-8674(00)81635-9
• Primary Citation of Related Structures:  
  1BYW


• PubMed Abstract: 
  

The HERG voltage-dependent K+ channel plays a role in cardiac electrical excitability, and when defective, it underlies one form of the long QT syndrome. We have determined the crystal structure of the HERG K+ channel N-terminal domain and studied its role as a modifier of gating using electrophysiological methods. The domain is similar in structure to a bacterial light sensor photoactive yellow protein and provides the first three-dimensional model of a eukaryotic PAS domain. Scanning mutagenesis of the domain surface has allowed the identification of a hydrophobic "hot spot" forming a putative interface with the body of the K+ channel to which it tightly binds. The presence of the domain attached to the channel slows the rate of deactivation. Given the roles of PAS domains in biology, we propose that the HERG N-terminal domain has a regulatory function.

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Organizational Affiliation: 

Laboratory of Molecular Neurobiology and Biophysics, Rockefeller University, New York, New York 10021, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (HUMAN ERG POTASSIUM CHANNEL)	A	110	Homo sapiens	Mutation(s): 1  Gene Names: KCNH2, ERG, ERG1, HERG
Find proteins for Q12809 (Homo sapiens) Explore Q12809  Go to UniProtKB:  Q12809
NIH Common Fund Data Resources
PHAROS:  Q12809 GTEx:  ENSG00000055118

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.286 
• R-Value Work: 0.252 
• R-Value Observed: 0.252 
• Space Group: P 6₅ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 56.1	α = 90
b = 56.1	β = 90
c = 135.5	γ = 120

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
CCP4	model building
X-PLOR	refinement
CCP4	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1998-10-15 
• Released Date: 1998-12-16 
Deposition Author(s): Cabral, J.H.M., Lee, A., Mackinnon, R.

Revision History 

• Version 1.0: 1998-12-16
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2018-03-14
  Changes: Database references