Biological Assembly 1  

 3D View: Structure

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 21.99 kDa 
• Atom Count: 1438 
• Residue Count: 166 
• Unique protein chains: 1

1HUW

THE CRYSTAL STRUCTURE OF AFFINITY-MATURED HUMAN GROWTH HORMONE AT 2 ANGSTROMS RESOLUTION

• DOI: 10.2210/pdb1HUW/pdb

• Classification: HORMONE
• Organism(s): Homo sapiens
• Mutation(s): Yes 


• Deposited: 1993-09-22 Released: 1994-01-31 
• Deposition Author(s): Ultsch, M.H., Somers, W.S., Kossiakoff, A.A., De Vos, A.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Work: 0.185 
• R-Value Observed: 0.185 

Literature

The crystal structure of affinity-matured human growth hormone at 2 A resolution.

Ultsch, M.H., Somers, W., Kossiakoff, A.A., de Vos, A.M.

(1994) J Mol Biol 236: 286-299

• PubMed: 8107110 
• DOI: 10.1006/jmbi.1994.1135
• Primary Citation of Related Structures:  
  1HUW


• PubMed Abstract: 
  

A variant of human growth hormone (hGH), in which 15 mutations were introduced with phage display mutagenesis to improve receptor binding affinity by 400-fold, yielded two related crystal forms diffracting to high resolution. The structure of this variant was determined in both crystal forms, one at 2.0 A resolution and one at 2.4 A resolution, using molecular replacement with wild-type hGH taken from the receptor complex structure as a search model. Crystallographic refinement of the 2 A structure gave an R-value R-value of 18.5% for data in the resolution range 8 to 2 A. The final model consists of residues 1 to 128 and 155 to 191, with three side-chains modeled in alternative conformations, together with 77 water molecules. Comparison of the structure with wild-type hGH shows that most of the secondary structural elements are unchanged. The exception is the first turn of the third helix in the four-helix bundle core, which is unraveled in the present variant. Analysis of the two related packing environments suggests that this change is caused by crystal packing forces. A large change in the orientation of a short segment of helix found in the connection between the first two core helices is interpreted as evidence for rigid-body variability of this helical segment. Analysis of the mutations in light of the structure of the wild-type hGH/receptor complex shows that six of the mutations are buried in the hormone, whereas the remaining nine involve residues that interact with the receptor in the complex.

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Related Citations: 

• Affinity Maturation of Human Growth Hormone by Monovalent Phage Display
  Lowman, H.B., Wells, J.A.
  () To be published --: --

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Organizational Affiliation: 

Department of Protein Engineering Genetech, Inc, South San Francisco, CA 94080.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
HUMAN GROWTH HORMONE	A	191	Homo sapiens	Mutation(s): 15  Gene Names: GH1
Find proteins for P01241 (Homo sapiens) Explore P01241  Go to UniProtKB:  P01241
NIH Common Fund Data Resources
PHAROS:  P01241 GTEx:  ENSG00000259384

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Work: 0.185 
• R-Value Observed: 0.185 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 80.45	α = 90
b = 59.34	β = 128.2
c = 50.87	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1993-09-22 
• Released Date: 1994-01-31 
Deposition Author(s): Ultsch, M.H., Somers, W.S., Kossiakoff, A.A., De Vos, A.M.

Revision History 

• Version 1.0: 1994-01-31
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance