Amylose A (fiber, powder and electron diffraction)
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Diffraction Diagram
Fig.1 Examples of electron diffraction diagrams recorded under frozen wet conditions from crystals rotated about their long axis. The indexations and the corresponding zone axes of these diagrams are also presented.
(a)The goniometer setting was (a) 36°, (b) -10° (c) +20°.
*Permission Pending for Diffraction Diagrams
Diffraction Diagram
Fig.1 Examples of electron diffraction diagrams recorded under frozen wet conditions from crystals rotated about their long axis. The indexations and the corresponding zone axes of these diagrams are also presented.
(a)The goniometer setting was (a) 36°, (b) -10° (c) +20°.
Fig.2 Examples of electron diffraction diagrams recorded under frozen wet conditions from crystals rotated about an axis perpendicular to their long direction. In (a) reflection 2 is twice as intense as that in 1. In (b) reflection 3 is slightly less intense than 1, 2 and 3 which index as --1-2-1 and --1 2-1 in an orthorhombic system, should have equivalent intensities. This is not the case and hence the monoclinic indexation is favoured.
*Permission Pending for Diffraction Diagrams
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Amylose A (fiber, powder and electron diffraction)
Linkage :
alpha 1-4    
Space Group :
monoclinic B2
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) =
21.24
- b (Å) =
11.72
- c (Å) =
10.69
- γ (°) =
123.00
Helix Type :
two left-handed, parallel-stranded double helices packed in a parallel fashion
Method(s) Used
For Structure Determination :
electron diffraction, X-ray powder patterns and X-ray fibre diffraction data
Link to the
Abstract :
http://www.ncbi.nlm.nih.gov/pubmed/3418703
Reference :
The Double-helical Nature of the Crystalline Part of A-Starch
Anne Imberty, Henri Chanzy, Serge Pérez, Alain Buléon and Vinh Tran, 1988, J. Mol. Biol, 201, 365-378
Download Structure
Unit AmyA_double
polysacdb/amylose-a/AmyA_double.pdb
amylose-a_expandedpolysacdb/amylose-a/amylose-a_expanded.pdb