1l16

STRUCTURAL ANALYSIS OF THE TEMPERATURE-SENSITIVE MUTANT OF BACTERIOPHAGE T4 LYSOZYME, GLYCINE 156 (RIGHT ARROW) ASPARTIC ACID

spinqualitylabelsall models 1l16, resolution 1.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1l16 is a 1 chain structure with sequence from Escherichia virus T4. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.7Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function ENLYS_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. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The structure of the mutant of bacteriophage T4 lysozyme in which Gly-156 is replaced by aspartic acid is described. The lysozyme was isolated by screening for temperature-sensitive mutants and has a melting temperature at pH 6.5 that is 6.1 degrees C lower than wild type. The mutant structure is destabilized, in part, because Gly-156 has conformational angles (phi, psi) that are not optimal for a residue with a beta-carbon. High resolution crystallographic refinement of the mutant structure (R = 17.7% at 1.7 A resolution) shows that the Gly----Asp substitution does not significantly alter the configurational angles (phi, psi) but forces the backbone to move, as a whole, approximately 0.6 A away from its position in wild-type lysozyme. This induced strain weakens a hydrogen bond network that exists in the wild-type structure and also contributes to the reduced stability of the mutant lysozyme. The introduction of an acidic side chain reduces the overall charge on the molecule and thereby tends to increase the stability of the mutant structure relative to wild type. However, at neutral pH this generalized electrostatic stabilization is offset by specific electrostatic repulsion between Asp-156 and Asp-92. The activity of the mutant lysozyme is approximately 50% that of wild-type lysozyme. This reduction in activity might be due to introduction of a negative charge and/or perturbation of the surface of the molecule in the region that is assumed to interact with peptidoglycan substrates. Structural analysis of the temperature-sensitive mutant of bacteriophage T4 lysozyme, glycine 156----aspartic acid.,Gray TM, Matthews BW J Biol Chem. 1987 Dec 15;262(35):16858-64. PMID:3680274 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Lysozyme 3D structures

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