Insilico designing of Pyrazol-1-Yl Azetidin-2-One derivatives as drug like molecules for possible inhibition of Anti Microbial 3GI9, 4AE5, 3FHU and 5COX target Proteins

  1. Chemistry Department of Trident AcademyTechnology, Bhubaneswar- 751024.
  2. University Department of Pharmaceutical Sciences, Utkal University, Vani Vihar Bhubaneswar-751004.
  3. State Drugs Testing and Research Laboratory, Bhubaneswar- 751014 Odisha, India.
  4. I.P.T, Salipur, Cuttack, Odisha, India.
Corresponding Author: MOHANTA. R. K E-mail: [email protected]
Date of Submission: 11-11-2013 Date of Acceptance: 29-11-2013 Conflict of Interest: NIL Source of Support: NONE
Copyright: © 2014 MOHANTA. R. K et al, publisher and licensee IYPF. This is an Open Access article which permits unrestricted noncommercial use, provided the original work is properly cited.
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Two series of 1- [ [3-(substituted phenyl)-5-substituted-4,5-dihydro-1HPyrazol- 1-yl] Carbonothionyl]-3-chloro-4- (Fuan-2-yl)] Azetidin-2-ones derivates were interacted through inter or intra molecular hydrogen bonding by the enzymatic keys and ADME toxicity, solubility, Drug-score and Biological activities studies, which indicated that the compounds 4(P1-P7, P11-P77) have drug likeness properties. The enzymatic keys are the target proteins or receptors of E.coli (3GI9), S.a. (4AE5), S.typhi (3FHU), cyclooxygenase (5COX) and helped for designing of the compounds 4 (P1-P7, P11-P77) for better activities by the MVD-5.0.5 software


LBVS, ADME toxicity study, Biological activity study, Druglikeness study and Molecular Docking study.


Infections are the re-emergency diseases of life threatening, caused by bacteria (parasites) like E. coli, S. aureus, S. typhi. Normally Escherichia coli is a highly remarkable adapted pathogen which has a capable to produced wide range of infections like gastroenteritis to extra intestinal infections of the urinary tract, bloodstream and central nervous system. Mainly Escherichia coli (gram-ve) is remarkable for urinary tract infection (UTI) and various type conterminous infection diseases caused by Staphylococcus aurous (gram+ve). While the main causative agent of typhoid is Salmonella typhi. The glucocorticoid and prostaglandins are potent mediators of Inflammation in which the body reacts to infection, irritation or other injury were the key feature of redness, warmth, swelling and pain. In the early of 1990th s, the enzymatic key was discovered as a cyclooxygenase which catalyses for the biosynthesis path of arachidonic acid to prostaglandins. The cyclooxygenase enzyme has two isomeric forms likely Cox-1 and Cox-2. The cox-1was produced in many tissues like kidney and GIT, while cox-2 was the inducible and expressed during the inflammation at a site of the injury.
The heterocycles are important components of bio-molecules such as RNA, DNA, protein and vitamin in which the aromatic rings fused with five member heterocyclic moieties containing N,S,O , exhibited wide range of pharmacological activities like anti-inflammatory, antbacterial, antifungal etc. Keeping in the view of pharmacological activity was emphasized to designing the drug compounds of two series by the interaction of enzymatic keys in MDV5.o.5. The enzymatic key as receptors ( 3GI95, 4AE56, 3FHU7 and 5COX8) of cyclooxygenase, bacteria’s and reductase. The cyclooxygenase (COX, also known as PGH synthase) receptor was pharmacological target of NSAIDs. The 5COX pdb (cyclooxygenase inhibitor-2 or COX-2) was also known as PGH synthase-2. The murine structures of COX-2 was unliganded at SC-558 .The murine cox-2 was complexed with compounds to produced exert selective COX-2 inhibitor . While the E. coli (3GI9) receptor acts as Amino acid, polyamine, and organocation (APC) transporters which recycling the neurotransmitter to uptake of nutrient and regulate the ionic homeostasis. The S. aureus (4AE5) was contained fibrogen –binding clumping factor (ClfB) as like as dermokine peptide binding mode of (ClfB) ( glycine-serinerich, GSR ) replication. The main causative agent of typhoid is Salmonella typhi. The 3FHUpdb was extracted from native PilS protein (Delta PilS or IVb pilin) of S.typhi. The Delta pilS was interacted with extracellular domain of cystic fibrosis trans membrane conductance regulator (CFTR) and forming active site insight on the amino acids for binding. The pilus functions were helped to designing the suitable antibacterial analogs.


Drawing of these structures, energy minimization and docking of 1-[[3-(substituted phenyl)-5-substituted-4,5-dihydro-1H-Pyrazol- 1-yl]Carbonothionyl]-3-chloro-4-(Fuan-2-yl)] Azetidin-2-ones derivates were done by using Chem. sketch and MVD 5.0.5 .
The ADME toxicity study of the proposed titled compounds 4(P1-7, P11-77) were done in “Medchem2 Software”.
The Biological Activity study was tested in “Mol inspiration software” by on line submission of the title compounds.
The Drug-likeness properties were studied in “Osisir Molecular property Explorer software” by online submission of the compounds 4(P1-7, P11-77).
The target proteins i.e. E. coli (3GI9), S. aurous (4AE5), S. typhi (3FHU) and cyclooxygenase (5COX) were derived from protein data bank (RCBS).
To finding the best pose energies of Ligands, 4(P1-7, P11-77) and the target proteins interaction through hydrogen bonding were visualized in “Molegro Virtual Docker-5.0.5 software”.


Computer-based molecular design has been employed in bioinformatics, medicine, biochemistry, Biophysics and other fields. Computational design has speed up research by identifying new molecules with possible medical applications prior to laborious experiments and expensive preclinical studies. However, substantial computational resources and programming proficiencies are usually needed to design computationally molecules with desired biological properties. This precludes researchers who lack computer resources in many countries and small institutions from carrying out studies in the field. A simple, yet effective procedure presented as.

ADME toxicity study

The Five Rules of Lipinski is studied in Medchem2 software to purify and evaluate the drugs as druglikeness properties for orally active in human. In generally Lipinski’s rule says that for an orally active drug have the following criteria:
Not more than one violation.
Not more than 5 hydrogen bond donors (nitrogen or oxygen atoms with one or more hydrogen atoms).
Not more than 10 hydrogen bond acceptors (nitrogen or oxygen atoms).
Molecular weight under 500 Daltons.
The octanol-water partition coefficient log P of less than 5.
The rule describes molecular properties important for a drug’s pharmacokinetics in the human body, including their absorption, distribution, metabolism, and excretion (ADME). The compounds (4P1-7, P11-77) used in this study satisfy the rule (see Table -01) and are efficiently analyzed. The modification of the molecular structure often leads to drugs with higher molecular weight, more rings, more rotatable bonds, and a higher lipophilicity.

Biological activity study9

The biological activity scoring is an Expert system of Molinspiration technology for calculation of drug likeness score towards GPCR ligands, ion channel modulators, kinase inhibitors, nuclear receptor ligands, protease inhibitors studies furnished the 1- [ [3-(substituted phenyl)-5- substituted-4,5-dihydro-1H-Pyrazol-1-yl] Carbonothionyl]-3-chloro-4- (Fuan-2-yl)] Azetidin-2- ones derivates as “average drug-like molecule” and the larger value of the BA score will be highly active molecule. As compared to the standard drugs, ciprofloxacin, indomethacin and aspirin, all compounds have shown good affinity toward these six inhibitors and were shown in table-02.

Drug-likeness study10

Drug likeness may be defined as a complex balance of various molecular properties and structure features which determine whether particular molecule is similar to the known drugs. These properties mainly hydrophobicity, electronic distribution, hydrogen bonding characteristics, molecule size and flexibility and of course presence of various pharmacophoric features influence the behavior of molecule in a living organism, including bioavailability, transport properties, affinity to proteins, reactivity, toxicity, metabolic stability and many others. The diversity of possible drug targets is so enormous, that it is possible to find a common denominator for all of them and to express molecule drug-likeness by a single "magic number" i.e molecular weight, logP, or number of hydrogen bond donors or acceptors.

(1)Toxicity Risk Assessment

The drawing structures (4P1-7, P11-77) of the toxicity risk predictor will be validated on Osisir explorer due to toxicity risk alerts may be harmful the drawn structure and concerning the specified risk category. In order to assess the toxicity prediction's the precomputed set of structural fragments were encountered the shreddering of any molecule by RTECS database. These in turn were used to reconstruct all possible bigger fragments being a substructure of the original molecule. Afterwards, a substructure search process determined the occurrence frequency of any fragment (core and constructed fragments) within all compounds of that toxicity class. Based on the assumption that traded drugs are largely free of toxic effects, any fragment was considered a risk factor if it occurred often as substructure of harmful compounds but never or rarely in traded drugs.The proposed titled compounds were tested the toxicity studies in osisir property Explorer which indicates that, all the compounds have no toxic in nature toward the mutagenicity and are shown in table-03.

(2) C Log P Calculation

The log P value of a compound, which is the logarithm of its partition coefficient between noctanol and water log(c octanol /c water), is a well established measure of the compound's hydrophilicity. Low hydrophilicities and therefore high log P values cause poor absorption or permeation. It has been shown for compounds to have a reasonable probability of being well absorb their log P value must not be greater than 5.0. The distribution of calculated log P values of compounds (4P1-7, P11-77) were shown below.

(3) Solubility (log S) Calculation

The aqueous solubility of a compound significantly affects its absorption and distribution characteristics. Typically, a low solubility goes along with a bad absorption and therefore the general aim is to avoid poorly soluble compounds. Our estimated log S value is a unit stripped logarithm (base 10) of the solubility measured in mol/liter.
The solubility via an increment system by adding atom contributions depending on their atom types.
The solubility of a compound is also depending on the arrangement of molecule in the crystal.
The logs of the compound depend on pH.
In the following diagram you can see that more than 90% of the compounds 4(P1-P77) have a (estimated) logS value greater than 4.

(4) Molecular Weight

Optimizing compounds for high activity on a biological target almost often goes along with increased molecular weights. However, compounds with higher weights are less likely to be absorbed and therefore to ever reach the place of action. Thus, trying to keep molecular weights as low as possible should be the desire of every drug forger.
The diagram shows that more than 96 % of compounds have a molecular weight below 450.

(5) Drug likeness

There are many approaches around that assess a compound's drug likeness partially based on topological descriptors, fingerprints of MDL structure keys or other properties as cLog P and molecular weights. The drug likeness is calculated with the following equation summing up score values of those fragments that are present in the molecule under investigation.
The way fragment substitution patterns list were created by shreddering, cut of rotatable bonds or retained of fragment atoms in the original compounds and these properties were analyzed in compounds 4(P1-P77).

(6) Drug Score

ds: the drug score, si : are the contributions calculated directly from of cLogP, logS, molecular weight and druglikeness (pi) via the second equation which describes a spline curve. Parameters a and b are (1, -5), (1, 5), (0.012, -6) and (1, 0) for c Log P, log S, mol weight and drug likeness, respectively. ti are the contributions taken from the 4 toxicity risk types. The ti values are 1.0, 0.8 and 0.6 for no risk, medium risk and high risk, respectively. Thus most of the compounds 4(P1-P77) were shown good drug-scoring due to all of their scoring value was 0.6.

Molecular docking (MVD-5.0.5)1-4

Computational methods are now a ubiquitous part of modern drug design. Being able to predict and visualized drug candidates and their interactions with the target receptor makes it possible to rationally optimize the potential drugs is an important advantage in a competitive area of researched field. Molegro virual Docker is a highly accuracy molecular docking software which predicted the small flexible of ligands (4P1-P77) linked through intra and inter molecular Hbonding with protein receptors during the time of protein –ligand docking. The protein-Ligand docking results were shown in table-01 and steps of the docking are -
Import and export of standard file formats (PDB, Mol2, and SDF).
Displaceable water model.
Automated preparation of input structures.
Predict potential binding sites.
Protein binding pocket flexibility.
Repair, mutate, or minimize side chains before docking.
Visually inspect docking predictions with relevant interactions.


The insilico designing has been an important part of solid phase chemistry to purifying and minimized the cost of NCE. The proposed twonovel series of compounds have good tolerating efficacy in ADME toxicity studies. While the intrainter molecular attraction of compounds through hydrogen bonding with six receptors were Scaffold the promised biological activities (BA). The drug –likeness properties like solubility, drugscore and drug-liking score was guided by “Osisir molecular Explorer” which has made these compounds free from toxicity risk into therapeutically active analogs.
Molecular docking is an interesting part of attraction of ligands and target proteins to find out the active site of receptor as well as the biological activity compounds through the best pose energy. The docking results reveal that all the selected title compounds inside target proteins (three bacterial and one cox) were outlined by different amino acids and the hydrophobic pockets. Small ligand molecules were bound to 3GI9, 4AE5, 3FHU and 5COX by four binding modes such as hydrogen bonds, Vander Waals, electrostatic and hydrophobic interactions. The total energy of four binding modes and different energies, interacting surfaces between designed compounds comparison with standard drugs were given in Tables-04-07. Calculated free energy of binding for compounds 4P1-77 and ciprofloxacin, indomethacin and aspirin in the binding sites were -148.767, -144.124, - 142.640, -144.667,-94.489, -130.670, and -72.660 kcal/mol respectively in their best pose. The highest free energy of binding and lowest interactive surface is observed with Compound 4P1, 4P11 and 4P77 than other docked molecules (4P2-P66). Therefore, among all docked molecules, 4P1-77 possess highest probability of interaction with binding site of target proteins and it is comparable with that of standard antagonist. Furthermore, the present data showed that the substituent like Cl and furfuryl present in lactum ring resulted in improvement ability of binding was increased. Therefore it was observed that the in vitro insilico method revealed that the compounds of pyrazol- 1-yl azetidin-2-one derivatives acted as an antiantibacterial as well as anti-inflammatory agents.
GPCR: G- Protein couple Receptor, IM: Ion channel Modulator, KI: Kinase Inhibitor, NR: Nuclear Receptor, PI: Protease Inhibitor, EI: Enzymatic Inhibitor


Step 1: synthesis of chalcone

Step 2:

Step 3: synthesis of Schiff bases
Step 4: Synthesis of azetidin-2-one.


In conclusion, the molecular docking study of the title compounds reveals better activity. Indicating the pyrazol-1-yl azetidin-2-one derivatives scaffold influences the pharmacological activity. From the best posed energy, the compounds having electronegative group such as halogens are found to be more activity as compared to others. It is observed that the chloro at 3 position on beta lactum ring increases the activity. However, the difference in activity profile with structural modifications provides further scope to explore these compounds for better bioactivity.


The authors thankfully acknowledge to the chairman and Director of Trident Academy of Technology. We also extend our thanks to Mr. R.K. Das for helping hand in entire research at State Drug Testing Laboratory, Bhubaneswar. Finally grate gratitude goes to the HOD,UDPS, Utkal University who has permitted for carrying out this research work.

Tables at a glance

Table icon Table icon Table icon Table icon
Table 1 Table 2 Table 3 Table 4
Table icon Table icon Table icon
Table 1 Table 2 Table 3


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9) Molinspiration virtual screening toolkit miscreen(on line test).

10) OSIRIS Property Explorer
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