- Protein crystallography
Main steps: - Protein purification - Crystallisation
Special: - Programs for crystallography - X-ray detectors
Basic tutorials: - Chemistry - Protein - Peptide - Amino Acids
Xtal community: - CCP4BB
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Subject: Negative density around C of COO- From: Narayanan Ramasubbu ramasun1 {- at -} UMDNJ {- dot -} EDU Date: 2008-05-05
Dear all: I am noticing that in some of my structures, at 1.5 A resolution, 1) there is some negative density around the C of the carboxyl groups. 2) I also notice the negative density around S in a disulfide region. It is as though the disulfide is broken.
Could some body enlighten me on this feature?
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