PolySacDb

A Database of Polysachharide 3D structures

 
By A. Sarkar & S. Pérez
 
 
 

Polysaccharides For Experts

Galactomannan

 

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Diffraction Diagram

 

Fig.1 X-Ray diffraction pattern from a polycrystalline and well oriented fiber of guaran (81% r.h.) which was tipped approximately 9° towards the incident beam in order to register the meridional reflection on the second layer line.

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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)

 

  Galactomannan

Linkage :       beta 1-4      alpha 1-6

 

Space Group :       orthorhombic I222

 

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) =   9.26

b (Å) =   30.84

c (Å) =   10.38

 

γ (°) =   90.00

β (°) =   90.00

α (°) =   90.00

 

Helix Type :      

2-fold helix of pitch 10.38 ?. 4 helices are packed in to an orthorhombic unit cell

 

Method(s) Used For Structure Determination :      

X-ray diffraction

 

Link to the Abstract :      
 
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFF-40BG3YG-29&_user=10&_coverDate=01%2F31%2F1998&_rdoc=1&_fmt=high&_orig=search&_origin=search&_sort=d&_docanchor=&view=c&_searchStrId=1620812139&_rerunOrigin=google&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=680502f4020d51ceedc02846c04565ee&searchtype=a

 

Reference :      

Morphology of galactomannans: an X-ray structure analysis of guaran
Rengaswami Chandrasekaran, Akella Radha and Kenji Okuyama, Carbohydrate Research 1998, 306 (1-2), 243-255

 

 

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