7AVF

Triclinic hydrogenated hen egg-white lysozyme at 100 K (control)

Summary for 7AVF

• Entry DOI: 10.2210/pdb7avf/pdb
• Descriptor: Lysozyme, NITRATE ION, ACETATE ION, ... (4 entities in total)
• Functional Keywords: lysozyme, hewl, hydrogenated, hydrolase
• Biological source: Gallus gallus
• Total number of polymer chains: 1
• Total formula weight: 14945.29

Authors

Ramos, J.,Laux, V.,Haertlein, M.,Erba Boeri, E.,Forsyth, V.T.,Mossou, E.,Larsen, S.,Langkilde, A.E. (deposition date: 2020-11-05, release date: 2021-05-12, Last modification date: 2024-01-31)

Primary citation

Ramos, J.,Laux, V.,Haertlein, M.,Boeri Erba, E.,McAuley, K.E.,Forsyth, V.T.,Mossou, E.,Larsen, S.,Langkilde, A.E.
Structural insights into protein folding, stability and activity using in vivo perdeuteration of hen egg-white lysozyme.
Iucrj, 8:372-386, 2021

PubMed Abstract: This structural and biophysical study exploited a method of perdeuterating hen egg-white lysozyme based on the expression of insoluble protein in followed by in-column chemical refolding. This allowed detailed comparisons with perdeuterated lysozyme produced in the yeast , as well as with unlabelled lysozyme. Both perdeuterated variants exhibit reduced thermal stability and enzymatic activity in comparison with hydrogenated lysozyme. The thermal stability of refolded perdeuterated lysozyme is 4.9°C lower than that of the perdeuterated variant expressed and secreted in yeast and 6.8°C lower than that of the hydrogenated protein. However, both perdeuterated variants exhibit a comparable activity. Atomic resolution X-ray crystallographic analyses show that the differences in thermal stability and enzymatic function are correlated with refolding and deuteration effects. The hydrogen/deuterium isotope effect causes a decrease in the stability and activity of the perdeuterated analogues; this is believed to occur through a combination of changes to hydrophobicity and protein dynamics. The lower level of thermal stability of the refolded perdeuterated lysozyme is caused by the unrestrained Asn103 peptide-plane flip during the unfolded state, leading to a significant increase in disorder of the Lys97-Gly104 region following subsequent refolding. An ancillary outcome of this study has been the development of an efficient and financially viable protocol that allows stable and active perdeuterated lysozyme to be more easily available for scientific applications.

PubMed: 33953924
DOI: 10.1107/S2052252521001299

Experimental method

X-RAY DIFFRACTION (1 Å)