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2015 ; 10
(9
): 1275-84
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X-ray structure determination using low-resolution electron microscopy maps for
molecular replacement
#MMPMID26226459
Jackson RN
; McCoy AJ
; Terwilliger TC
; Read RJ
; Wiedenheft B
Nat Protoc
2015[Sep]; 10
(9
): 1275-84
PMID26226459
show ga
Structures of multisubunit macromolecular machines are primarily determined
either by electron microscopy (EM) or by X-ray crystallography. In many cases, a
structure for a complex can be obtained at low resolution (at a coarse level of
detail) with EM and at a higher resolution (with finer detail) by X-ray
crystallography. The integration of these two structural techniques is becoming
increasingly important for the generation of atomic models of macromolecular
complexes. A low-resolution EM image can be a powerful tool for obtaining the
'phase' information that is missing from an X-ray crystallography experiment;
however, integration of EM and X-ray diffraction data has been technically
challenging. Here we present a step-by-step protocol that explains how
low-resolution EM maps can be placed in the crystallographic unit cell by
molecular replacement, and how initial phases computed from the placed EM density
are extended to high resolution by averaging maps over noncrystallographic
symmetry. As the resolution gap between EM and X-ray crystallography continues to
narrow, the use of EM maps to help with X-ray crystal structure determination, as
described in this protocol, will become increasingly effective.