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[[Image:1sok.gif|left|200px]]
{{Seed}}
[[Image:1sok.png|left|200px]]


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{{STRUCTURE_1sok|  PDB=1sok  |  SCENE=  }}  
{{STRUCTURE_1sok|  PDB=1sok  |  SCENE=  }}  


'''Crystal structure of the transthyretin mutant A108Y/L110E solved in space group p21212'''
===Crystal structure of the transthyretin mutant A108Y/L110E solved in space group p21212===




==Overview==
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Conformational changes in native and variant forms of the human plasma protein transthyretin (TTR) induce several types of amyloid diseases. Biochemical and structural studies have mapped the initiation site of amyloid formation onto residues at the outer C and D beta-strands and their connecting loop. In this study, we characterise an engineered variant of transthyretin, Ala108Tyr/Leu110Glu, which is kinetically and thermodynamically more stable than wild-type transthyretin, and as a consequence less amyloidogenic. Crystal structures of the mutant were determined in two space groups, P2(1)2(1)2 and C2, from crystals grown in the same crystallisation set-up. The structures are identical with the exception for residues Leu55-Leu58, situated at beta-strand D and the following DE loop. In particular, residues Leu55-His56 display large shifts in the C2 structure. There the direct hydrogen bonding between beta-strands D and A has been disrupted and is absent, whereas the beta-strand D is present in the P2(1)2(1)2 structure. This difference shows that from a mixture of metastable TTR molecules, only the molecules with an intact beta-strand D are selected for crystal growth in space group P2(1)2(1)2. The packing of TTR molecules in the C2 crystal form and in the previously determined amyloid TTR (ATTR) Leu55Pro crystal structure is close-to-identical. This packing arrangement is therefore not unique in amyloidogenic mutants of TTR.
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{{ABSTRACT_PUBMED_15210129}}


==About this Structure==
==About this Structure==
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[[Category: Sauer-Eriksson, A E.]]
[[Category: Sauer-Eriksson, A E.]]
[[Category: Greek key beta barrel]]
[[Category: Greek key beta barrel]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 08:57:20 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 19:18:03 2008''

Revision as of 16:18, 27 July 2008

File:1sok.png

Template:STRUCTURE 1sok

Crystal structure of the transthyretin mutant A108Y/L110E solved in space group p21212

Template:ABSTRACT PUBMED 15210129

About this Structure

1SOK is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

The beta-strand D of transthyretin trapped in two discrete conformations., Hornberg A, Olofsson A, Eneqvist T, Lundgren E, Sauer-Eriksson AE, Biochim Biophys Acta. 2004 Jul 1;1700(1):93-104. PMID:15210129

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