6a4o

HEWL crystals soaked in 2.5M GuHCl for 20 minutes

spinqualitylabelsall models 6a4o, resolution 1.75Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6a4o is a 1 chain structure with sequence from Gallus gallus. This structure supersedes the now removed PDB entry 5h6c. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.75Å Ligands: CL, GAI, GOL Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function LYSC_CHICK Lysozymes have primarily a bacteriolytic function; those in tissues and body fluids are associated with the monocyte-macrophage system and enhance the activity of immunoagents. Has bacteriolytic activity against M.luteus. Publication Abstract from PubMed Time-dependent binding of guanidine hydrochloride (GuHCl) to hen egg-white lysozyme (HEWL), and effects of this binding on the protein structure have been investigated by solving X-ray structures of crystalline complexes. The complexes have been prepared by soaking, for different periods of time, native lysozyme crystals in solutions containing 2.5M GuHCl. In the refined structures, the number of water molecules in the protein's first solvent shell has progressively decreased from 152 to 115, showing protein's preference for guanidinium over water. Guanidinium ions preferentially hydrogen bond with the backbone carbonyl oxygen atoms. In their van der Waals interactions, they do not show any preference for apolar residues. Guanidinium ions have replaced water molecules that form cages around exposed hydrophobic residues. Guanidinium binding has decreased the average length of water-water hydrogen bond by 0.1A. The hydrogen bonds between main chain atoms have been weakened by GuHCl, and this may be the reason for increased potency of GuHCl compared to urea. Guanidinium binding destabilizes the beta-domain by causing loss of hydrogen bonds involving Asn 59 side chain. Interestingly, this loss is almost identical to that observed in structures of amyloidogenic variants of human lysozyme. Compounds preventing this loss could be anti-amyloidogenic. X-ray crystallographic analysis of time-dependent binding of guanidine hydrochloride to HEWL: First steps during protein unfolding.,Raskar T, Koh CY, Niebling S, Kini RM, Hosur MV Int J Biol Macromol. 2019 Feb 1;122:903-913. doi: 10.1016/j.ijbiomac.2018.11.023., Epub 2018 Nov 6. PMID:30412756 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Lysozyme 3D structures

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