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NMR study of the reconstitution of the β‐sheet of thioredoxin by fragment complementation
Author(s) -
Tasayco María Luisa,
Chao Kan
Publication year - 1995
Publication title -
proteins: structure, function, and bioinformatics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.699
H-Index - 191
eISSN - 1097-0134
pISSN - 0887-3585
DOI - 10.1002/prot.340220106
Subject(s) - fragment (logic) , complementation , thioredoxin , chemistry , computational biology , computer science , biology , biochemistry , programming language , gene , phenotype
The study of complementary protein fragments is thought to be generally useful to identify early folding intermediates. A prerequisite for these studies is the reconstitution of the native‐like structure by fragment complementation. Structural analysis of the complementation of the domain‐sized proteolytic fragments of E. coli thioredoxin, using a combination of H‐exchange and 2D NMR experiments as a fingerprint technique, provide evidence for the extensive reconstitution of a native β‐sheet, with local conformational adjustments near the cleavage site. Remarkably, the antiparallel β‐strand between the fragments shows a native‐like protection of the amide protons to solvent exchange. Our results indicate that these fragments can be useful to study the early events in the still little understood formation of β‐sheets. © 1995 Wiley‐Liss, Inc.