PolySacDb

A Database of Polysachharide 3D structures

 
By A. Sarkar & S. Pérez
 
 
 

Polysaccharides For Experts

Poly-α-L-Guluronic Acid (Alginic acid)

 

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Diffraction Diagram

           

Fig.1 X-ray diffraction fiber photograph obtained from polyguluronic acid. The pattern indexes on an orthorhombic unit cell with the fiber axis = 8.7 ± 0.1 Å.

(a)(A) polyguluronic acid

(b)(B) polyguluronate-K+

(c)(C) polyguluronate-NH4+

(d)(D) polyguluronate-Li+

(e)(E) polyguluronate-Ca

(f)(F) polyguluronate-Mg2+

*Permission Pending for Diffraction Diagrams

(Please right-click & view the image if it appears distorted here)

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Structures are best viewed using PyMol & Sybyl

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  Poly-α-L-Guluronic Acid (Alginic acid)

Linkage :       alpha 1-4     

 

Space Group :       orthorhombic P212121

 

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) =   8.60

b (Å) =   8.70

c (Å) =   10.70

 

 

Helix Type :      

2-fold helix

 

Method(s) Used For Structure Determination :      

X-ray diffraction and polarized infrared studies

 

Link to the Abstract :      
 
http://www.ncbi.nlm.nih.gov/pubmed/4733713

 

Reference :      

Structural Components of Alginic Acid. II. The Crystalline Structure of Poly-?-L-Guluronic Acid. Results of X-Ray Diffraction and Polarized Infrared Studies
Atkins, E.D.T., Nieduszynski, I.A., Mackie, W., Parker, K.D. and Smolko, E.E. , Biopolymers, 1973, 12(8), Pages 1879 - 1887

 

 

Download Structure

Unit          polyguluronic-acid-21_expanded          polyguluronic-acid-32_expanded

 

 

 

 

 
   
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