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2017 ; 9
(5
): 517-527
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Going deep into protein secondary structure with synchrotron radiation circular
dichroism spectroscopy
#MMPMID28825203
Kumagai PS
; Araujo APU
; Lopes JLS
Biophys Rev
2017[Oct]; 9
(5
): 517-527
PMID28825203
show ga
Circular dichroism (CD) spectroscopy is a fast, powerful, well-established, and
widely used analytical technique in the biophysical and structural biology
community to study protein secondary structure and to track changes in protein
conformation in different environments. The use of the intense light of a
synchrotron beam as the light source for collecting CD measurements has emerged
as an enhanced method, known as synchrotron radiation circular dichroism (SRCD)
spectroscopy, that has several advantages over the conventional CD method,
including a significant spectral range extension for data collection, deeper
access to the lower limit (cut-off) of conventional CD spectroscopy, an improved
signal-to-noise ratio to increase accuracy in the measurements, and the
possibility to collect measurements in highly absorbing solutions. In this
review, we discuss different applications of the SRCD technique by researchers
from Latin America. In this context, we specifically look at the use of this
method for examining the secondary structure and conformational behavior of
proteins belonging to the four main classes of the hierarchical protein domain
classification CATH (Class, Architecture, Topology, Homology) database, focusing
on the advantages and improvements associated with SRCD spectroscopy in terms of
characterizing proteins composed of different structural elements.