Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Protein Workshop | Ligand Explorer

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 18867.59 
• Atom Count: 1303 
• Residue Count: 164 
• Unique protein chains: 1

115L

STRUCTURAL BASIS OF ALPHA-HELIX PROPENSITY AT TWO SITES IN T4 LYSOZYME

• DOI: 10.2210/pdb115L/pdb

• Classification: HYDROLASE(O-GLYCOSYL)
• Organism(s): Enterobacteria phage T4


• Deposited: 1992-12-17 Released: 1993-10-31 
• Deposition Author(s): Blaber, M., Matthews, B.W.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.8 Å

Literature

Structural basis of amino acid alpha helix propensity.

Blaber, M., Zhang, X.J., Matthews, B.W.

(1993) Science 260: 1637-1640

• PubMed: 8503008 
• Primary Citation of Related Structures:  
  217L, 216L, 137L, 114L, 113L, 112L, 111L, 110L, 109L, 108L, 107L


• PubMed Abstract: 
  

The propensity of an amino acid to form an alpha helix in a protein was determined by multiple amino substitutions at positions 44 and 131 in T4 lysozyme. These positions are solvent-exposed sites within the alpha helices that comprise, respectively, residues 39 to 50 and 126 to 134. Except for two acidic substitutions that may be involved in salt bridges, the changes in stability at the two sites agree well. The stability values also agree with those observed for corresponding amino acid substitutions in some model peptides. Thus, helix propensity values derived from model peptides can be applicable to proteins. Among the 20 naturally occurring amino acids, proline, glycine, and alanine each have a structurally unique feature that helps to explain their low or high helix propensities. For the remaining 17 amino acids, it appears that the side chain hydrophobic surface buried against the side of the helix contributes substantially to alpha helix propensity.

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Related Citations: 

• Structure of Bacteriophage T4 Lysozyme Refined at 1.7 Angstroms Resolution
  Weaver, L.H.,Matthews, B.W.
  (1987) J.Mol.Biol. 193: 189
• Control of Enzyme Activity by an Engineered Disulfide Bond
  Matsumura, M.,Matthews, B.W.
  (1989) Science 243: 792




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Organizational Affiliation: 

Institute of Molecular Biology, Howard Hughes Medical Institute, University of Oregon, Eugene 97403.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
T4 LYSOZYME	A	164	Enterobacteria phage T4	Mutation(s): 0  Gene Names: E EC: 3.2.1.17
Find proteins for P00720 (Enterobacteria phage T4) Go to UniProtKB:  P00720

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
CL	A	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M
BME	A	BETA-MERCAPTOETHANOL C2 H6 O S DGVVWUTYPXICAM-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.8 Å
• Space Group: P 3₂ 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 61.000	α = 90.00
b = 61.000	β = 90.00
c = 96.600	γ = 120.00

Software Package:

Software Name	Purpose
TNT	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1992-12-17 
• Released Date: 1993-10-31 
• Deposition Author(s): Blaber, M., Matthews, B.W.

Revision History 

• Version 1.0: 1993-10-31
  Type: Initial release
• Version 1.1: 2008-03-24
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance
• Version 1.3: 2017-11-29
  Type: Derived calculations, Other