chemistry

Molecular Operating Environment

Molecular Operating Environment is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Molecular Operating Environment rather than just read about it. In short: Molecular Operating Environment (MOE) is a drug discovery software platform that integrates visualization, modeling and simulations, as well as methodology development, in one package. MOE scientific applications are used by biologists, medicinal chemists and computational chemists in pharmaceutical, biotechnology and academic research.

Key takeaways

Molecular Operating Environment belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Molecular Operating Environment to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Molecular Operating Environment from memory before moving on to harder problems.

Reference excerpt

Molecular Operating Environment (MOE) is a drug discovery software platform that integrates visualization, modeling and simulations, as well as methodology development, in one package. MOE scientific applications are used by biologists, medicinal chemists and computational chemists in pharmaceutical, biotechnology and academic research. MOE runs on Windows, Linux, Unix, and macOS. Main application areas in MOE include structure-based design, fragment-based design, ligand-based design, pharmacophore discovery, medicinal chemistry applications, biologics applications, structural biology and bioinformatics, protein and antibody modeling, molecular modeling and simulations, virtual screening, cheminformatics & QSAR. The Scientific Vector Language (SVL) is the built-in command, scripting and application development language of MOE.

History The Molecular Operating Environment was developed by the Chemical Computing Group under the supervision of President/CEO Paul Labute. Founded in 1994 and based in Montreal, Quebec, Canada, this private company is dedicated to developing computation software that will challenge, revolutionize, and aid in the scientific methodology. The Chemical Computing Group contains a team of mathematicians, scientists, and software engineers constantly altering and updating MOE in order to improve the fields of theoretical/computational chemistry and biology, molecular modeling, and computer-driven molecular design. Researchers specializing in pharmaceutics (drug-discovery); computational chemistry; biotechnology; bioinformatics; cheminformatics; molecular dynamics, simulations, and modeling are the main clients of the Chemical Computing Group.

Software As discussed before, MOE is a versatile software with main applications in 3D molecular visualization; structure-based protein-ligand design; antibody and biologics design, structure-based protein engineering; SAR and SPR visualization; ligand-based design; protein, DNA/RNA modeling; virtual screening; 3D pharmacophore screening; fragment-based discovery; structural bioinformatics; molecular mechanics and dynamics; peptide modeling; structural biology; cheminformatics and QSAR.

Molecular Modeling and Simulations

Molecular modeling and simulations is a process often used in computational chemistry, but there is wide application for researchers in a variety of fields. This theoretical approach allows scientists to extensively study the properties of molecules, and using the data can provide insight into how these molecules may behave in biological and/or chemical systems. This information is vital to the design of new materials and chemicals.

Molecular Docking Molecular docking is a computation study used to primarily analyze the binding affinity of a ligand and a receptor. Often times, proteins are studied using this technique, because data from molecular docking allows scientists to predict if a ligand will bind to a specific molecule and if so, how strongly. Molecular docking can be used to predict the binding mode of already known ligands and/or novel ligands, and as a binding affinity predictive instrument. Binding affinity is measured by the change in energy and the more negative the energy, the more stable the complex and the tighter the ligand binds to the receptor. Data from molecular docking can be used to construct new compounds that are more or less efficient at binding to a specific molecule. Molecular docking is extensively used throughout drug discovery for these reasons.

Preparing for molecular docking studies can involve many steps. When docking proteins, proteins are obtained from the Protein Data Bank (PDB), which is an online, open access resources containing the classification, structure/folding, organism, sequence length, mutations, genome, sequence, and other data relating to proteins. The structure of a protein can precisely be determined through a process known as X-ray crystallography. This process involves a concentrated beam of X-rays that is directed at a crystal. When X-rays are projected to a crystal structure, the crystal diffracts the X-rays in specific directions. These directions allow scientists to map and determine the detailed structure of proteins, which is then recorded and uploaded to the PDB.

Methods The protein structure file is downloaded from the PDB and opened in a molecular docking software. There are many programs that can facilitate molecular docking such as AutoDock, DOCK, FlexX, HYDRO, LIGPLOT, SPROUT, STALK, and Molegro Virtual Docker. Alternatively, some protein structures have not been experimentally determined through the use of X-ray crystallography and therefore, are not found on the PDB. In order to produce a protein molecule that can be used for docking, scientists can use the amino acid sequence of a protein and a program named UniProt to find protein structures in the PDB that have similar amino acid sequences. The amino acid sequence of the protein that is being constructed is then used in combination with the protein structure found in the PDB with the highest percent similarity (template protein) in order to create the target protein used in docking. Although this method does not produce an exact model of the target protein, it allows scientists to produce the closest possible structure in order to conduct computational methods and gain some insight into the behavior of a protein. After constructing the necessary molecules for docking, they are imported into a computational docking software such as MOE. In this program, proteins can be visualized and certain parts of the molecule can be isolated in order to obtain more precise data for a region of interest. A cavity, or region where the molecular docking will take place, is set around the binding site, which is the region in the receptor protein where the ligand attaches to. After specifying the cavity, molecular docking settings are configured and the program is run in order to determine the binding energy of the complex.

Molecular Dynamics (MD)

… excerpt ends here. Continue reading the full article.

Illustrations

Molecular Operating Environment: Molecular dynamics simulation of a single atom into a crystal lattice. — Molecular dynamics simulation of a single atom into a crystal lattice.

Worked examples

Example 1 — a first encounter with Molecular Operating Environment

Start with the simplest possible case. Write down what Molecular Operating Environment claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Molecular Operating Environment before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Molecular Operating Environment ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Molecular Operating Environment

In research: Molecular Operating Environment appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Molecular Operating Environment in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Molecular Operating Environment is common in secondary-school and first-year university syllabi. It links to neighbouring topics Chemistry software for Linux, Computational chemistry software, Molecular modelling software, so understanding it makes those chapters shorter.
In everyday life: Look for Molecular Operating Environment outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Molecular Operating Environment” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Molecular Operating Environment in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Molecular Operating Environment means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Molecular Operating Environment out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Molecular Operating Environment in simple terms?

Why does Molecular Operating Environment matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Molecular Operating Environment?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Molecular Operating Environment.