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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Biophys+Rev
2015 ; 7
(2
): 165-174
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Nanoscale protein domain motion and long-range allostery in signaling proteins- a
view from neutron spin echo sprectroscopy
#MMPMID26005503
Callaway DJ
; Bu Z
Biophys Rev
2015[Jun]; 7
(2
): 165-174
PMID26005503
show ga
Many cellular proteins are multi-domain proteins. Coupled domain-domain
interactions in these multidomain proteins are important for the allosteric relay
of signals in the cellular signaling networks. We have initiated the application
of neutron spin echo spectroscopy to the study of nanoscale protein domain
motions on submicrosecond time scales and on nanometer length scale. Our NSE
experiments reveal the activation of protein domain motions over a long distance
of over more than 100 Å in a multidomain scaffolding protein NHERF1 upon binding
to another protein Ezrin. Such activation of nanoscale protein domains motions is
correlated with the allosteric assembly of multi-protein complexes by NHERF1 and
Ezrin. Here, we summarize the theoretical framework that we have developed, which
uses simple concepts from nonequilibrium statistical mechanics to interpret the
NSE data, and employs a mobility tensor to describe nanoscale protein domain
motion. Extracting nanoscale protein domain motion from the NSE does not require
elaborate molecular dynamics simulations, or complex fits to rotational motion,
or elastic network models. The approach is thus more robust than multiparameter
techniques that require untestable assumptions. We also demonstrate that an
experimental scheme of selective deuteration of a protein subunit in a complex
can highlight and amplify specific domain dynamics from the abundant global
translational and rotational motions in a protein. We expect NSE to provide a
unique tool to determine nanoscale protein dynamics for the understanding of
protein functions, such as how signals are propagated in a protein over a long
distance to a distal domain.