1PEF

PEPTIDE F (EQLLKALEFLLKELLEKL), AMPHIPHILIC OCTADECAPEPTIDE

• PDB DOI: https://doi.org/10.2210/pdb1PEF/pdb

• Classification: SYNTHETIC PROTEIN
• Mutation(s): No 


• Deposited: 1995-06-19 Released: 1996-12-07 
• Deposition Author(s): Garavito, R.M., Taylor, K., Yang, N.C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.50 Å
• R-Value Free: 0.196 
• R-Value Work: 0.170 
• R-Value Observed: 0.170 

Literature

A novel, multilayer structure of a helical peptide.

Taylor, K.S., Lou, M.Z., Chin, T.M., Yang, N.C., Garavito, R.M.

(1996) Protein Sci 5: 414-421

• PubMed: 8868477 
• DOI: https://doi.org/10.1002/pro.5560050302
• Primary Citation of Related Structures:  
  1PEF


• PubMed Abstract: 
  

  X-ray diffraction analysis at 1.5 A resolution has confirmed the helical conformation of a de novo designed 18-residue peptide. However, the crystal structure reveals the formation of continuous molecular layers of parallel-packed amphiphilic helices as a result of much more extensive helix-helix interactions than predicted. The crystal packing arrangement, by virtue of distinct antiparallel packing interactions, segregates the polar and apolar surfaces of the helices into discrete and well-defined interfacial regions. An extensive "ridges-into-grooves" interdigitation characterizes the hydrophobic interface, whereas an extensive network of salt bridges and hydrogen bonds dominates the corresponding hydrophilic interface.

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Organizational Affiliation: 

Department of Biochemistry and Molecular Biology, University of Chicago, Illinois 60637, USA.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 2.17 kDa 
• Atom Count: 162 
• Modelled Residue Count: 18 
• Deposited Residue Count: 18 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PEPTIDE F (EQLLKALEFLLKELLEKL)	A	18	N/A	Mutation(s): 0

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.50 Å
• R-Value Free: 0.196 
• R-Value Work: 0.170 
• R-Value Observed: 0.170 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 22.6	α = 90
b = 10.67	β = 101.85
c = 29.24	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
SADNES	data reduction
MADNES	data reduction
CCP4	data reduction
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1996-12-07 
Deposition Author(s): Garavito, R.M., Taylor, K., Yang, N.C.

Revision History  

• Version 1.0: 1996-12-07
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2018-04-18
  Changes: Data collection, Other
• Version 1.4: 2024-02-14
  Changes: Data collection, Database references