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15 a.a.
101 a.a.
Key reference
DOI no: 10.1002/(SICI)1097-0134(19990815)36:3<282::AID-PROT3>3.3.CO;2-6 Proteins 36:282-294 (1999) PubMed id: 10409822
X-ray crystallographic studies of the denaturation of ribonuclease S. G.S.Ratnaparkhi, R.Varadarajan. ABSTRACT
In an attempt to view the onset of urea denaturation in ribonuclease we have collected X-ray diffraction data on ribonuclease S crystals soaked in 0, 1.5, 2, 3, and 5 molar urea. At concentrations above 2 M urea, crystals were stabilized by glutaraldehyde crosslinking. We have also collected data on ribonuclease S crystals at low pH in an attempt to study the onset of pH denaturation. The resolution of the datasets range from 1.9 to 3.0 A. Analysis of the structures reveals an increase in disorder with increasing urea concentration. In the 5 M urea structure, this increase in disorder is apparent all over the structure but is larger in loop and helical regions than in the beta strands. The low pH structure shows a very similar pattern of increased disorder. In addition there is a major change in the position of the main chain (> 1 A) in the 65-72 turn region. This region has previously been shown to be involved in one of the initial steps of unfolding in the reduction of ribonuclease A. Crystallographic analyses in the presence of denaturant, when combined with controlled crosslinking, can thus provide detailed structural information that is related to the initial steps of unfolding in solution. Proteins 1999;36:282-294.
Selected figure(s)
Figure 5.
Figure 5. Analysis of water in the high resolution structures. A: RMSD plot. B:B-factor plot.
Figure 6.
Figure 6. Ribbon diagram of RNase S coloured according to value ofThe above figures are reprinted by permission from John Wiley & Sons, Inc.: Proteins (1999, 36, 282-294) copyright 1999. Figures were selected by an automated process.
Literature references that cite this PDB file's key reference
PubMed id Reference
11742124 E.Chatani, R.Hayashi, H.Moriyama, and T.Ueki (2002).
Conformational strictness required for maximum activity and stability of bovine pancreatic ribonuclease A as revealed by crystallographic study of three Phe120 mutants at 1.4 A resolution.Protein Sci, 11, 72-81.
PDB codes: 1eic 1eid 1eie 1fs3 The most recent references are shown first. Citation data come partly from CiteXplore and partly from an automated harvesting procedure. Note that this is likely to be only a partial list as not all journals are covered by either method. However, we are continually building up the citation data so more and more references will be included with time. Where a reference describes a PDB structure, the PDB codes are shown on the right.
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