2OQU

High Pressure Cryocooling of Capillary Sample Cryoprotection and Diffraction Phasing at Long Wavelengths

• PDB DOI: https://doi.org/10.2210/pdb2OQU/pdb

• Classification: HYDROLASE
• Organism(s): Sus scrofa
• Mutation(s): No 


• Deposited: 2007-02-01 Released: 2007-05-01 
• Deposition Author(s): Kim, C.U., Hao, Q., Gruner, S.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.226 
• R-Value Work: 0.178 
• R-Value Observed: 0.180 

Starting Model: experimental

Literature

High-pressure cryocooling for capillary sample cryoprotection and diffraction phasing at long wavelengths.

Kim, C.U., Hao, Q., Gruner, S.M.

(2007) Acta Crystallogr D Biol Crystallogr 63: 653-659

• PubMed: 17452791 
• DOI: https://doi.org/10.1107/S0907444907011924
• Primary Citation of Related Structures:  
  2OQN, 2OQU


• PubMed Abstract: 
  

  Crystal cryocooling is usually employed to reduce radiation damage during X-ray crystallography. Recently, a high-pressure cryocooling method has been developed which results in excellent diffraction-quality crystals without the use of penetrative cryoprotectants. Three new developments of the method are presented here: (i) Xe-He high-pressure cryocooling for Xe SAD phasing, (ii) native sulfur SAD phasing and (iii) successful cryopreservation of crystals in thick-walled capillaries without additional cryoprotectants other than the native mother liquor. These developments may be useful for structural solution of proteins without the need for selenomethionine incorporation and for high-throughput protein crystallography.

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Organizational Affiliation: 

Field of Biophysics, Cornell University, Ithaca, NY 14853, USA.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 26.2 kDa 
• Atom Count: 2,156 
• Modelled Residue Count: 240 
• Deposited Residue Count: 240 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Elastase-1	A	240	Sus scrofa	Mutation(s): 0  EC: 3.4.21.36
UniProt
Find proteins for P00772 (Sus scrofa) Explore P00772  Go to UniProtKB:  P00772

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
XE	D [auth A]	XENON Xe FHNFHKCVQCLJFQ-UHFFFAOYSA-N
SO4	C [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
CA	B [auth A]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.226 
• R-Value Work: 0.178 
• R-Value Observed: 0.180 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 50.153	α = 90
b = 58.166	β = 90
c = 74.658	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
ADSC	data collection
HKL-2000	data reduction
HKL-2000	data scaling
MOLREP	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2007-05-01 
Deposition Author(s): Kim, C.U., Hao, Q., Gruner, S.M.

Revision History  

• Version 1.0: 2007-05-01
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2023-08-30
  Changes: Data collection, Database references, Derived calculations, Refinement description
• Version 1.4: 2024-11-13
  Changes: Structure summary