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@INPROCEEDINGS{Schrader:848775,
author = {Schrader, Tobias Erich and Ostermann and Monkenbusch,
Michael and Laatsch, Bernhard and Jüttner, Ph. and Petry,
Winfried and Richter, Dieter},
title = {{N}eutron protein crystallography: {N}ew developments and
recent application examples},
reportid = {FZJ-2018-03710},
year = {2017},
abstract = {With the advent of new instruments (e. g. Imagine at HFIR,
MANDI at SNS and BIODIFF at FRMII) and well established
instruments (iBIX at JPARC and LADI at ILL) neutron protein
crystallography has seen a resurrection from the past
pioneering work by Schoenborn. New sample environment
options at the instruments and a growing user community have
greatly enhanced the outcome of the existing neutron
diffractometers. Measurements at 100 K in a nitrogen gas
stream (cryostream) are now routinely possible at most
neutron diffractometers. Efforts to increase the flux at the
sample position and to reduce the background at the detector
enable to measure smaller and smaller protein crystals. Yet,
measuring crystals with volumes below 0.1 mm3 is still a big
challenge and usually works only in exceptional cases. The
main scientific questions addressed are: Hydrogen bonding to
ligands/substrates, protonation states of amino acids in
intermediate states of the catalytic process and determining
the correct structure of metallo-proteins which are
subjected to reduction due to the radiation damage caused by
x-rays. But also the water shell on the outer surface of the
protein can be studied, whereby water molecules of different
flexibility can be observed.As an example for a neutron
diffractometer, the instrument BIODIFF is introduced: It is
a joint project of the Jülich Centre for Neutron Science
(JCNS) and the FRM II. BIODIFF is designed as a
monochromatic instrument with a narrow wavelength spread of
less than 3 $\%.$ To cover a large solid angle the main
detector of BIODIFF consists of a neutron imaging plate in a
cylindrical geometry with online read-out capability. An
optical CCD-camera pointing at the sample position is used
to quickly align the sample (or a Cadmium replica of it)
with respect to the neutron beam. The main advantage of
BIODIFF is the possibility to adapt the wavelength to the
size of the unit cell of the sample crystal while operating
with a clean monochromatic beam that keeps the background
level low.In this contribution, a review of most recent
application examples of neutron protein crystallography is
given. New developments are discussed which may lead to a
widening of the application scope of this method. Especially
the need for large protein (typically > 0.5 mm3 in volume)
crystals is addressed.},
month = {May},
date = {2017-05-24},
organization = {Instruct Biennial Structural Biology
Conference 2017, Brno (Czech Republic),
24 May 2017 - 26 May 2017},
subtyp = {Outreach},
cin = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
(München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1 /
ZEA-1 / JCNS-2},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)ZEA-1-20090406 /
I:(DE-Juel1)JCNS-2-20110106},
pnm = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
Neutron Research (JCNS) (POF3-623) / 6215 - Soft Matter,
Health and Life Sciences (POF3-621)},
pid = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4 /
G:(DE-HGF)POF3-6215},
experiment = {EXP:(DE-MLZ)BIODIFF-20140101},
typ = {PUB:(DE-HGF)24},
url = {https://juser.fz-juelich.de/record/848775},
}