NMR Studies on Domain Diffusion and Alignment in Modular GB1 Repeats

Overview

Journal Biophys J

Publisher Cell Press

Specialty Biophysics

Date 2010 Oct 21

PMID 20959105

Citations 26

Authors

Joseph D Walsh

Katlyn Meier

Rieko Ishima

Angela M Gronenborn

Affiliations

Soon will be listed here.

Abstract

Modular proteins contain individual domains that are often connected by flexible, unstructured linkers. Using a model system based on the GB1 domain, we constructed tandem repeat proteins and investigated the rotational diffusion and long-range angular ordering behavior of individual domains by measuring NMR relaxation parameters and residual dipolar couplings. Although they display almost identical protein-solvent interfaces, each domain exhibits distinct rotational diffusion and alignment properties. The diffusion tensor anisotropy of the N-terminal domain (NTD) is D(‖)/D(⊥) = 1.5-1.6, similar to that of single-GB1 domains (D(‖)/D(⊥) = 1.6-1.7), whereas the value for the C-terminal domain (CTD) is D(‖)/D(⊥) = 2.0-2.2. In addition, the two domains have different rotational correlation times. These effects are observed for linkers of three to 24 residues, irrespective of linker length. The NTD and CTD also differ in their degree of magnetic alignment, even with a flexible linker of 18 residues, exhibiting D(a) values of 7.7 Hz and 9.7 Hz, respectively. Our results suggest that diffusion differences and long-range influences may persist in modular protein systems, even for systems that have highly flexible linkers and exhibit no domain-domain or domain-linker interactions.

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