PolySacDb

A Database of Polysachharide 3D structures

 
By A. Sarkar & S. Pérez
 
 
 

Polysaccharides For Experts

Cellulose 1β

 

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Diffraction Diagram

 

Fig.1 (TOP) Synchrotron X-ray diffraction data collected on an online MAR image plate from fibers of Halocynthia cellulose Iα on station ID2A at the ESRF, Grenoble, France. (BOTTOM) A 3D fit of the Bragg intensities, done using custom-written software that takes into account fiber texture. The images have been remapped into cylindrical reciprocal space with the fiber axis vertical.

 

Fig.2 Neutron fiber diffraction patterns collected from two fibers of Halocynthia cellulose Iβ , one hydrogenated (TOP LEFT-HAND QUADRANT) and the other deuterated (TOP RIGHT-HAND QUADRANT). The bottom quadrants show 3D fits of the Bragg intensities, done using custom-written software that takes into account fiber texture. The images have been remapped into cylindrical reciprocal space with the fiber axis vertical.

*Permission Pending for Diffraction Diagrams

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Structures are best viewed using PyMol & Sybyl

(Please download the structure and view in a stand-alone viewer if the structure appears distorted in Jmol)

 

  Cellulose 1β

Linkage :       beta 1-4     

 

Space Group :       monoclinic P21

 

Unit Cell Dimensions (a, b, c in Å and α, β, γ in °)

(No values are displayed if no information is available or the value is zero)

a (Å) =   7.78

b (Å) =   8.20

c (Å) =   10.38

 

γ (°) =   96.55

β (°) =   90.00

α (°) =   90.00

 

Helix Type :      

parallel-up chain arrangement, two parallel chains

 

Method(s) Used For Structure Determination :      

X-ray and neutron fiber diffraction

 

Link to the Abstract :      
 
http://www.ncbi.nlm.nih.gov/pubmed/12149011

 

Reference :      

Crystal Structure and Hydrogen-Bonding System in Cellulose Ib from Synchrotron X-ray and Neutron Fiber Diffraction
Yoshiharu Nishiyama, Paul Langan, and Henri Chanzy, Journal of the American Chemical Society 2002, 124(31), 9074-9082

 

 

Download Structure

Unit          cellulose-1-beta-cornerchain_unit          cellulose-1-beta-2chains_expanded

 

 

 

 

 
   
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