5vnr
From Proteopedia
X-ray structure of perdeuterated T4 lysozyme cysteine-free pseudo-wild type at cryogenic temperature
Structural highlights
FunctionENLYS_BPT4 Endolysin with lysozyme activity that degrades host peptidoglycans and participates with the holin and spanin proteins in the sequential events which lead to the programmed host cell lysis releasing the mature viral particles. Once the holin has permeabilized the host cell membrane, the endolysin can reach the periplasm and break down the peptidoglycan layer.[1] Publication Abstract from PubMedBacteriophage T4 lysozyme (T4L) has been used as a paradigm for seminal biophysical studies on protein structure, dynamics, and stability. Approximately 700 mutants of this protein and their respective complexes have been characterized by X-ray crystallography; however, despite the high resolution diffraction limits attained in several studies, no hydrogen atoms were reported being visualized in the electron density maps. To address this, a 2.2 A-resolution neutron data set was collected at 80 K from a crystal of perdeuterated T4L pseudo-wild type. We describe a near complete atomic structure of T4L, which includes the positions of 1737 hydrogen atoms determined by neutron crystallography. The cryogenic neutron model reveals explicit detail of the hydrogen bonding interactions in the protein, in addition to the protonation states of several important residues. Neutron crystallographic studies of T4 lysozyme at cryogenic temperature.,Li L, Shukla S, Meilleur F, Standaert RF, Pierce J, Myles DAA, Cuneo MJ Protein Sci. 2017 Oct;26(10):2098-2104. doi: 10.1002/pro.3231. Epub 2017 Sep 6. PMID:28707382[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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