Topics

Major conformational changes in the structure of lysozyme obtained from a crystal with a very low solvent content.

08:00 EDT 1st November 2019 | BioPortfolio

Summary of "Major conformational changes in the structure of lysozyme obtained from a crystal with a very low solvent content."

A new crystal form of lysozyme with a very low solvent content (26.35%) has been obtained in the orthorhombic space group P222 (with unit-cell parameters a = 30.04, b = 51.68, c = 61.53 Å). The lysozyme structure obtained from these crystals does not show the typical overall fold. Instead, major conformational changes take place in some elements of the secondary structure and in the hydrophobic core of the protein. At the end of the central α-helix (α2), Glu35 is usually buried in the catalytic site and shows an abnormally high pK value, which is key to the activity of the enzyme. The high pK value of this glutamate residue is favoured by the hydrophobic environment, particularly by its neighbour Trp108, which is important for structural stability and saccharide binding. In this new structure, Trp108 shows a 90° rotation of its side chain, which results in the rearrangement of the hydrophobic core. Conformational changes also result in the exposure of Glu35 to the solvent, which impairs the catalytic site by increasing the distance between Glu35 and Asp52 and lowering the pK value of the glutamate. Altogether, this new lysozyme structure reveals major conformational changes in the hydrophobic core and catalytic site that might play a role in the folding and bactericidal function of the protein.

Affiliation

Journal Details

This article was published in the following journal.

Name: Acta crystallographica. Section F, Structural biology communications
ISSN: 2053-230X
Pages: 687-696

Links

DeepDyve research library

PubMed Articles [17660 Associated PubMed Articles listed on BioPortfolio]

X-ray crystal structure of the influenza A M2 proton channel S31N mutant in two conformational states: an open and shut case.

The amantadine-resistant S31N mutant of the influenza A M2 proton channel has become prevalent in currently circulating viruses. Here we have solved an X-ray crystal structure of M2(22-46) S31N that c...

Synthesis, Crystal Structure, and Optical Characterization of the Sulfide Chloride Oxide CsBaVSClO with a Near-Infrared Fluorescence.

When CsCl, BaS, BaO, V, and S are reacted in a solid-state reaction under inert conditions, pure powders and single crystals of senary CsBaVSClO can be obtained. Its unique crystal structure has the s...

Conformational, configurational, and supramolecular studies of podocephalol acetate from Lasianthaea aurea.

Although podocephalol (1) and its derived acetate 2 were found in Lasianthaea podocephala four decades ago, and 1 was later detected in the essential oils of several vegetal species, its absolute conf...

Double-edged effects of aluminium ions on amyloid fibrillation of hen egg-white lysozyme.

Elucidating the effects of Al(III) ions on amyloid fibrillation is important to understand the association between metal ions and Alzheimer's disease. Here, Raman spectroscopy was applied to investiga...

Structure Elucidation of a Melam-Melem Adduct by a Combined Approach of Synchrotron X-ray Diffraction and DFT Calculations.

Melam-melem (1:1), an adduct compound that can be obtained from dicyandiamide in autoclave reactions at 450 °C and elevated ammonia pressure, had previously been described based on mass spectrometry ...

Clinical Trials [4891 Associated Clinical Trials listed on BioPortfolio]

Effects of Lysozyme on Acute Exacerbation of Chronic Obstructive Pulmonary Disease : A Randomised Placebo-Controlled Study

The aim of this study is to assess the effectiveness in preventing exacerbation of 52 weeks lysozyme administration in patients with COPD.

Lactoferrin and Lysozyme Supplementation for Environmental Enteric Dysfunction

Randomized, double-blind, placebo controlled trial of daily lactoferrin and lysozyme supplementation in improving environmental enteric dysfunction in Malawian children

The Serum Angiotensin Converting Enzyme and Lysozyme Levels in Patients Non-infectious and Infectious Uveitis

This study evaluates the significance of differences in serum angiotensin converting enzyme and lysozyme levels of patients with ocular involvement of other autoimmune inflammatory and inf...

Co-crystal E-58425 vs Tramadol and Celecoxib for Moderate to Severe Acute Pain After Bunionectomy. Phase III Clinical Trial.

This is a Phase 3, randomized, double-blind, controlled, parallel-group, multicenter clinical trial with co-crystal E-58425 compared to tramadol, to celecoxib, and to placebo. The primary ...

Human Lysozyme Goat Milk in Treating Patients With Blood Cancer Undergoing Donor Stem Cell Transplant

This randomized pilot phase I trial studies the side effects of human lysozyme goat milk in treating patients with blood cancer undergoing a donor stem cell transplant. Sometimes the trans...

Medical and Biotech [MESH] Definitions

A class of fibrous proteins or scleroproteins that represents the principal constituent of EPIDERMIS; HAIR; NAILS; horny tissues, and the organic matrix of tooth ENAMEL. Two major conformational groups have been characterized, alpha-keratin, whose peptide backbone forms a coiled-coil alpha helical structure consisting of TYPE I KERATIN and a TYPE II KERATIN, and beta-keratin, whose backbone forms a zigzag or pleated sheet structure. alpha-Keratins have been classified into at least 20 subtypes. In addition multiple isoforms of subtypes have been found which may be due to GENE DUPLICATION.

The study of crystal structure using X-RAY DIFFRACTION techniques. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)

A central nervous system stimulant and sympathomimetic with actions and uses similar to DEXTROAMPHETAMINE. The smokable form is a drug of abuse and is referred to as crank, crystal, crystal meth, ice, and speed.

Variation in a population's DNA sequence that is detected by determining alterations in the conformation of denatured DNA fragments. Denatured DNA fragments are allowed to renature under conditions that prevent the formation of double-stranded DNA and allow secondary structure to form in single stranded fragments. These fragments are then run through polyacrylamide gels to detect variations in the secondary structure that is manifested as an alteration in migration through the gels.

The use of a quartz crystal microbalance for measuring weights and forces in the micro- to nanogram range. It is used to study the chemical and mechanical properties of thin layers, such as polymer coatings and lipid membranes; and interactions between molecues.

Quick Search


DeepDyve research library

Relevant Topics

Nutrition
Within medicine, nutrition (the study of food and the effect of its components on the body) has many different roles. Appropriate nutrition can help prevent certain diseases, or treat others. In critically ill patients, artificial feeding by tubes need t...

Enzymes
Enzymes are proteins that catalyze (i.e., increase the rates of) chemical reactions. In enzymatic reactions, the molecules at the beginning of the process, called substrates, are converted into different molecules, called products. Almost all chemical re...


Searches Linking to this Article