Difference between revisions of "User:Dhea Patel/Notebook/CHEM 572: ADA&Inhibitor Kinetics/2013/01/30"

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*to use Maestro and Canvas to calculate molecular fingerprints and docking scores of various commercial compounds in relation to the ADA active site.
*Taken from [[User:Mary_Mendoza/Notebook/CHEM572_Exp._Biological_Chemistry_II/2013/01/30|Mary's Notebook]]. We did all the steps together.
==Opening Maestro==
#From the assigned computer, a new terminal was created by either:
##Finder > Services > New terminal at folder OR
##press the provided shortcut key F5
#Then, enter $maestro to open the suite.
#Draw the molecule on the workspace area.
##Modifications can be made through the Edit panel > build > fragments > atom properties.
##Sponge the drawn molecule for clarity.
#Save the molecule:
##create this entry on the project table OR
##Workspace option > project entry > name and create the project and then save.
#Put the molecule under energy minimization to find a stable energetically conformation.
B. Energy Minimization
* To initiate energy minimization, go to the Applications option > Impact > Minimization.
* Minimization analyzes the molecule using Classical Physics.
* A dialog box appears with the force field set on OPLS 2005.
* Then click the Minimization tab. On the maximum cycles, this was changed to 10,000. The other standard parameters such as gradient criterion (0.01) and energy change criterion (1e-07) were kept. The pH was changed to the desired pH level of 7.4.
* Knowing there are amino acids present, by changing the pH of the parameters, the structure must also be converted to its alkoxide form at pH 7.4. As a result, through atom types O3 was changed to OM.
* After all the parameters were set for minimization, the host zorro was chosen and the minimization was started.
* Double-click the finished minimization on the monitor jobs (from applications option), then label the partial charges of the molecule.
* Save the project entry.
C. Calculation of Fingerprint
* Opened Canvas from the Finder by typing $Canvas
* Created a new project and named it as Aspirin_fingerprint.
* Imported the energy minimized aspirin saved earlier from maestro.
* Under applications option, click binary fingerprints > molprint2D and create.
* Click on the imported molecule and incorporate.
* Export the molecule by saving it with an extension of .fp
* A dialog box will appear, choose remove all properties and click ok.
* Close the project.
D. Screen Fingerprint
* After closing the previous aspirin project, open the zinc database.
* Imported the aspirin.fp molecule and allow duplicate mappings.
* Go to the Applications > similar/distance screen > select aspirin.
** Tanimoto similarity
* Selected the fingerprint column and choose the fingerprint (aspirin)
* Screened the molecules and then incorporate ~ 15,001
* Clicked the fingerprint screen column and sort in descending order to show molecules closest to aspirin.
* On the panel, select rows 1-15,001
* Saved the selection by exporting the project as aspirin_15001.mae along with its properties and click OK.
** A noticeable common feature among the imported database is the benzene ring.
* Closed Canvas
E. Docking Preparation
[[Image:Prepwizard2.png|thumb|right|Protein Preparation Wizard_Import and Process Tab]]
* Opened the protein databank (PDB) website, www.rcsb.org, and acquired two ADA Bovine structures. The two following structures were chosen by desirable resolutions:
**1KRM (resolution 2.5 angstroms)
**2Z7G (resolution 2.52 angstroms)
* The pdb.txt of these structures were downloaded.
* On Maestro, opened the aspirin.prj and imported the downloaded structures of ADA.
* The structures of ADA were protonated according to the pH of 7.4. This was executed from:
** Workflows > Protein preparation Wizard
** On the Import and Process Tab, add H<sup>+</sup> (see image on the right side of the protein preparation wizard dialog box)
** Uncheck the delete waters on the dialog box and click preprocess.
** Moving to the Refine Tab, changed the default pH of 7.0 to 7.4 as shown below.
** Then click Optimize
F. Superimposition of Proteins
* After Optimization, navigated through Tools > Protein Structure Alignment
** All > align
** From the Undisplay icon, remove waters for both structures
* Added ribbons for all residues to view the entire structure
* Upon scanning the structure, subtracted all portions leaving only the ligand on display at 5 Angstroms.
* Compared both structures by superimposing them.
* Verified structure 1KRM has a better resolution and removed 2Z7G from the project table.
* Showed ribbons for 1KRM and colored element entry carbons
G. Docking
* Duplicated the 1KRM H-minimized and deleted water molecules by manually clicking on each.
** Removed the water molecules to remove the rigidity of the protein. This also interferes with the docking of compounds by taking up space.
* Changed ribbon color by residue position
* Made a grid of the docking region by:
** Application > Glide > Receptor Grid Generation
** Select the ligand
** Click site tab > center on ligand > change dock ligands to 15 Angstroms
** Click Start
* Changed the grid name and specified the host: zorro; click OK
* Seeing the docking is done from the Monitor Jobs window:
** Applications > Glide > Ligand Docking
** Browse for the .zip grid previously created
** Verify host: zorro and click start
* Imported the glide.pv file
* Excluded the protein structure leaving only the ligand
* Superimposed the raw, crystallized PDB ADA ligand structure with the docked ligand
* Imported flavonoids to compare with the docked ligand by superimposition
* Database screening was initiated by going to Applications > Glide > Ligand Docking
* Selected the entry with 15,000 compounds from the .pv file
* Selected zorro host and clicked start

Revision as of 13:53, 8 May 2013

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