Fig. 8
From: Ultra-high resolution X-ray structure of orthorhombic bovine pancreatic Ribonuclease A at 100K
a (i) Alpha-helix II Orthorhombic Ribonuclease A. (ii) Alpha-helix II Orthorhombic Ribonuclease A showing Arg-33 and Asn-34 H-bonded at the side of the helix. b α-helix II covering residues Asp-NH2-24 to Arg-33. There are 2 waters and an EtOH on Asn-24, 2 waters on Asn-27 and Gln-28, 1 water on Met-30, Lys-31 and Ser-32 [not shown]. c α-helix III covering residues Ser-50 to Gln-NH2-60. SOE1168 hydrogen bonds to both Ser-50 and Leu-51. A number of water molecules H-bond to the residues along the helix [at least 15 can be seen in c]. Drawn with Biovia [19]. d The Hydrogen-bond link between α-helix I and α-helix II in Orthorhombic RNase A. The arrows indicate the direction of each helix which is opposed. There is an ethanol molecule EOH A 204 H-bonded to Asp-NH2-24 in α-helix II. Drawn with Biovia [19]