1Department of Pharmacy, Annamalai University, Annamalai Nagar-608002, Tamilnadu, India. 2Immunology Laboratory, Department of Pharmacy, Annamalai University, Annamalai Nagar-608002, Tamilnadu, India. 3S. A. Raja Pharmacy College, Vadakangulam, Tirunelveli, Tamilnadu-627116, India. 4Azidus Laboratories Ltd., Rathinamangalam, Vandalur, Chennai-600048, Tamilnadu, India. 5Centre for Cell Biology and Drug Discovery, Faculty of Engineering, Annamalai University, India
*Corresponding author: Parthasarathy V.; *Email: vapartha@yahoo.com
Received: 05 Jun 2023, Revised and Accepted: 01 Aug 2023
ABSTRACT
Objective: The present investigation explores the binding affinities of Irinotecan, which is a topoisomerase I inhibitor, against the targets such as AKT1, TNKS-2, MMP, EGFR, TNKS-1, and BRAF, which are the protein that was overexpressed by colorectal carcinogenesis.
Methods: In this study, the drug structure was drawn by chemdraw software and explored for its anti-cancer potential by Schrodinger software against selected targeted proteins such as epidermal growth factor receptor (EGFR), matrix metalloproteinase (MMPs), serine/threonine protein kinase Ba (AKT1), BRAF, tankyrases 1 (TNKS-1, and tankyrases 2 (TNKS-2).
Results: From the results of docking analysis, the targets with the maximum binding affinity towards the preselected drug Irinotecan were further subjected to ADME prediction by the QikProp module of Schrodinger Maestro version 2018.4. Molecular docking analysis revealed that surface protein targets AKT1, TNKS-2, MMP, and EGFR have the highest binding affinity towards the selected topoisomerase I inhibitor Irinotecan when compared to TNKS-1 and BRAF targets. The higher docking score of Irinotecan with extracellular colorectal cancer target proteins was discovered in this investigation.
Conclusion: Cancer is one of the most prevalent, lethal and risky malignant pathologies with an elevated prevalence and mortality rate worldwide. The current work will be more beneficial for rationalising the effective anticancer treatment according to the intensities of expression of the colon cancer target protein and for creating an optimum targeted drug delivery system of an anticancer agent to treat colon cancer.
Keywords: Colorectal cancer, Irinotecan hydrochloride, Marker proteins, Molecular Docking, Lipinski's rule
© 2023 The Authors. Published by Innovare Academic Sciences Pvt Ltd. This is an open access article under the CC BY license (https://creativecommons.org/licenses/by/4.0/)
DOI: https://dx.doi.org/10.22159/ijap.2023v15i5.48523. Journal homepage: https://innovareacademics.in/journals/index.php/ijap
Cancer is a physiological condition that develops as a consequence of the body's cells proliferating abnormally. Globally, cancer is widespread in mostly six organs: lung, breast, colorectal, prostate, stomach and cervical [1, 2]. Colorectal cancer (CRC), ranks among the most extensive and third most chief causes of death, driven on by some genetic changes in the colorectal mucosal lining and has emerged as a serious global health problem. In 2020, it is anticipated that there would be 1.93 million new cases of CRC diagnosed and 0.94 million deaths globally [3, 4]. Despite variations in mortality rates, population growth and ageing are expected to cause the number of deaths from colon and rectal cancer to increase by 60.0% and 71.5%, respectively, in all countries through 2035. With an expected 2.4 lakh diagnoses by 2035, increased access to early detection services and specialised care is most likely responsible for the decreased mortality rates for colon and rectal cancer [5, 6]. Both changeable and immutable components are risk factors for Colon cancer (CC). Age and genetic predisposition are risk factors that cannot be modified; hence it is highly recommended to have people over 50 and/or with a family history of polyps and CRC examined [7]. Red and processed meat intake, alcohol use, and diets that are heavy in fat and low in fibre have all been related to an amplified risk of CC or CRC [8, 9]. Smoking, being overweight, and some other risk factors contribute to cancer development. Apoptosis usually stops damaged cells from becoming out of balance under normal physiological circumstances is avoided and control apoptosis [10]. FDA-approved drugs such as capecitabine, 5-fluorouracil, irinotecan, oxaliplatin, and trifluridine/tipiracil are commonly used anticancer drugs for chemotherapy [11-13]. Oxaliplatin (OX), irinotecan (IRI), and capecitabine are examples of medications used in multiple-agent chemotherapy. Various chemotherapy regimens, either alone or in combination, are used as current treatments for CRC. Examples include FOLFOXIRI (5-FU/oxaliplatin/irinotecan), FOLFIRI (5-FU/leucovorin/oxaliplatin), and FOLFOX (5-FU/leucovorin/oxaliplatin). High-grade toxicity includes neurological diseases, gastrointestinal side effects, myelosuppression, neutropenia, anaemia, etc causes frequently necessitates dose restrictions or the termination of anticancer therapy [14-16]. The important drug targets for colon cancer include Epidermal growth factor receptor (EGFR) [17], Matrix metalloproteinase (MMP) [18, 19], Serine/threonine protein kinase Ba (AKT1) [20], BRAF [21, 22], tankyrases 1 and 2 (TNKS-1 and TNKS-2) [23, 24], Mitogen-activated protein kinase 3 (MAPK3) [25, 26], Human tyrosine-protein kinase (C-SRC) [27, 28], Tumour suppressor p53 (TP53) [29-31], Glyceralde-3-phosphate dehydrogenase (GAPDH) [32, 33], poly (ADP-ribosyl) polymerase 1 (PARP) [34, 35], inducible nitric oxide synthase (iNOS) [36-38], Checkpoint kinase 1 (Chk1) [39-41], and so on.
Fig. 1: Structure of Irinotecan, (4S)-4,11-diethyl-4-hydroxy-9-([4-piperidino-piperidino] carbonyloxy)1H-pyrano(3′,4′:6,7) indolizino (1,2-b) quinol-3,14, (4H,12H)-dione hydrochloride or 7-ethyl-10-(4-[1-piperidino]1-piperidino) carbonyloxy camptothecin
Irinotecan (IRT) is an alkaloid extract from the plant Camptotheca acuminata that is water-soluble and semi-synthetic in nature. Chemically, irinotecan is irinotecan hydrochloride trihydrate (4S)-4,11-diethyl-4-hydroxy-9-([4-piperidino-piperidino] carbonyloxy). 1H-pyrano (3′, 4′: 6, 7) indolizino (1,2-b) quinol-3,14 (4H, 12H)-dione hydrochloride or 7-ethyl-10-(4-[1-piperidino]-1-piperidino) carbonyloxy camptothecin. For the treatment of colorectal cancer which is resistant to 5-fluorouracil (5-FU), it has received FDA approval as a first-line chemotherapeutic medication [42-44]. IRT is transformed in living cells into the active metabolite 7-ethyl-10-hydroxycamptothecine (SN-38), which attaches to the topoisomerase I-DNA complex, and prevents DNA strand breaks from being relegated, and causes cytotoxicity [43, 45, 46].
Molecular docking analysis is essential for discovering new drugs as well as determining how drugs interact with molecules and receptors. The primary goal of the current investigation was to use in silico docking analysis against the chosen targets to determine the degree of specificity of the chemical component irinotecan for its potential anti-cancer effect on colon cancer and to overcome the side effects of the drug by releasing IRT directly into the cancer cells. The colon cancer-specific marker proteins chosen for the present study are, among others, EGFR, MMP, AKT1, BRAF, TNKS-1, and TNKS-2. Schrödinger software was employed to carry out the investigation. The protein data bank (PDB) was used to mine these proteins. In addition to this, the Lipinski rule was used to predict the drug similarity and the ADME (absorption, distribution, metabolism, and excretion) characteristics of Irinotecan. The transmembrane glycoprotein known as the epidermal growth factor (EGF) receptor is a member of the tyrosine kinase receptor family. The binding of EGF to its cognate ligands might result in autophosphorylation and subsequent signal transduction pathways (cellular proliferation, differentiation, and survival) [47, 48]. Matrix metalloproteinases (MMPs) are proteolytic enzymes that are zinc-dependent metalloproteinases that have the potential to break down the proteins in the extracellular matrix (ECM) [24, 49-52]. AKT, or Protein Kinase B, is a protein kinase (PKB), a serine/threonine kinase that stops apoptosis, governs glycogen metabolism, and encourages the growth of cancer. AKT that has been phosphorylated and overexpressed is a therapeutic target for the management of malignant tumours [53]. AKT activation regulates apoptosis as well as the cell cycle, cell motility, and angiogenesis, which promote cell transformation and cancer [54]. The B-Raf proto-oncogene, serine/threonine kinase gene (BRAF), is a critical molecular genomic marker utilised in CRC diagnosis, prognosis, and therapy modalities [55]. The BRAF gene participates in the MAPK/ERK signalling pathway, which is crucial for the development of cancer and other diseases (RASopathies). This route influences crucial cell processes such as proliferation, senescence, apoptosis, differentiation, and growth [56, 57]. Tankyrases are members of the two-membered family of proteins known as poly (ADP)-ribose polymerases (PARPs): tankyrase 1 (TNKS-1) and tankyrase 2 (TNKS-2) [23]. Tankyrase exerts positive control on the Wnt/b-catenin signalling pathway, which is amplified in the early stages of colorectal cancer development [58].
Preparation of protein
Three-dimensional (3D) crystal structures of the proteins, namely, epidermal growth factor receptor (EGFR) (PDB code: 1M17), matrix metalloproteinase (MMPs) (PDB code: 2DDY), serine/threonine protein kinase Ba (AKT1) (PDB code: 3O96), BRAF (PDB code: 4MNE), Tankyrases 1 (TNKS-1) (PDB code: 5ECE), and Tankyrases 2 (TNKS-2) (PDB code: 6KRO) were recognised and imported from the Protein Data Bank (PDB) (http://www.rcsb.org/pdb/-home/home.do). The resolutions of the target proteins are 2.60 Å (1M17), 2.31 Å (2DDY), 2.70 Å (Akt 1), 2.85 Å (BRAF), and 2.20 Å (Tankyrases 1) and were considered good for further analysis. "Protein preparation wizard" was used to import the proteins' 3D structures. Using the required modelling calculations of Schrodinger software, the protein was created in this manner. A protein structure with heavy atoms, metal ions, missing hydrogen atoms, water molecules, co-crystallised ligands, and incomplete and terminal amide groups may be found and extracted using the protein data bank. The wizard fixed the bond ordering, made formal adjustments, added the missing protons, treated the metals, and got rid of the water that extended past the heteroatom's 5th position. Using Epik, the potential ionisation states for the protein's ligand were produced, and the most stable state was chosen [59]. Using the force field OPLS-2005 and a restricted root mean square deviation (RMSD) tolerance of 0.3, the protein was then minimised under controlled conditions [60].
Receptor grid generation
The "receptor grid creation" feature was used to create the grid over the ligands associated with an active site while keeping the ligands present in all proteins. The protein's active site is indicated by the centroid (cubical) shape that forms over the ligand [61, 62].
Ligand preparation
Irinotecan chemical structure and formula (C33H38N4O6) were created using "Chemdraw" and then saved in SDF format (fig. 1). The ligand was then loaded into Schrodinger 2018's "LigPrep" module software. The molecule's 2D structure was changed into a low-energy 3D structure [63]. These were added to by the creation of several structures with various ionisation states: tautomers, stereo-isomers, and ring conformations. The ligand was also tuned for its shape and energy minimization. Ionisation and tautomeric states were produced in a pH range of 6.8 to 7.2 using the "EPIK" module. The optimal potentials for liquid simulations-2005 (OPLS-2005) force field was used to decrease the compounds, yielding a root mean square deviation (RMSD) value of 1.8 [64].
Molecular docking
The formerly chosen receptor grid and ligand were used throughout the docking procedure, which was carried out using the Schrodinger "Glide" module [65, 66]. Using the Glide "Ligand docking" tool, the favourable contacts between the ligand molecules were rated. The extra precision (XP) form and force field of OPLS-2005 were used to perform the docking calculations. The docking postures were changed using a series of hierarchical filters, and the flexible docking mode was used to assess how well the ligand connected to the receptor. The strategy minimises steric collisions while emphasising advantageous metal ligation, hydrogen bonds, and hydrophobic interactions. The method's last phase involves rating the reduced postures using the Glide "Scoring function" and force field OPLS-2005 minimization [67].
“Lipinski's rule of five (Ro5)” and the analysis of pharmacokinetics (ADME) properties
To prevent the failure of a molecule at the end of the drug development process, in silico analysis is a crucial method for early preclinical evaluation of a novel chemical entity. Using this method, the processes for expanding medicinal molecules are rationalised, and time and resources are greatly saved. Almost 40% of drug candidates fail owing to inadequate pharmacokinetic properties such as absorption, distribution, metabolism, and excretion (ADME) characteristics. In order to accurately predict the ADME properties of a freshly created molecule and to screen challenging drug candidates that shouldn't be explored further, high-throughput screening (HTS) techniques are used. Amazingly, using this technique, the failed chemical is changed to enhance its beneficial characteristics [68].
The preferred filter, Lipinski's Rule of Five (Ro5), is more effective in predicting a molecule's bioavailability. According to the five requirements in 2004 (Lipinski), the molecular mass should be less than 500 daltons, there should be no more than five hydrogen bond donors and no more than ten hydrogen bond acceptors, and the "log P" octonal/water partition coefficient should be less than five. The Schrodinger 2018.1 "QikProp" tool was used to forecast Lipinski's Rule of Five (Ro5), and pharmacokinetic characteristics such as absorption, distribution, metabolism, and excretion (ADME) (Schrodinger, 2018) [69-71].
Using the sophisticated molecular docking programme "Schrodinger Maestro version 11," several target proteins in colon cancer and the ligand "Irinotecan" were studied on the active sites. The "LigPrep" tool from Schrodinger software was used to optimise the ligand irinotecan, which was then used for docking experiments. The colon cancer proteins EGFR, MMP, AKT1, BRAF, TNKS-1, and TNKS-2 were made using the protein preparation wizard programme of Schrodinger. Schrodinger's receptor grid creation method was used to build the cube-shaped grid/active site area. The selected and set-up Grid region or active site was designed to bind or interact with the target drug, "Irinotecan." The research rated the binding affinity of irinotecan for each of its target proteins. Binding orientations of Irinotecan with the crystal structure of EGFR, MMP, AKT1, BRAF, TNKS-1, and TNKS-2 was given in fig. 1-7.
Fig. 2: Binding orientations of Irinotecan with the crystal structure of Epidermal growth factor receptor (EGFR) and its hydrogen-bond interactions with amino acids
Fig. 3: Binding orientations of Irinotecan with the crystal structure of matrix metalloproteinase (MMPs) and its hydrogen-bond interactions with amino acids
Fig. 4: Binding orientations of Irinotecan with the crystal structure of serine/threonine protein kinase Ba (AKT1) and its hydrogen-bond interactions with amino acids
Fig. 5: Binding orientations of Irinotecan with the crystal structure BRAF
Fig. 6: Binding orientations of Irinotecan with the crystal structure of Tankyrases 1 (TNKS-1)
Fig. 7: Binding orientations of Irinotecan with the crystal structure of Tankyrases 2 (TNKS-2) and its hydrogen-bond interactions with amino acids
Using schrodinger's GLIDE programme, molecular docking was done on all target proteins, including EGFR, MMP, AKT1, BRAF, TNKS-1, and TNKS-2. The predicted values of docking score, Glide evdw (Van Der Waals energy), ecoul (Coulomb energy), Glide energy, and the interacting residues (Hydrogen bond/-bond) were all carefully examined to ascertain the extent of interaction between the target proteins and Irinotecan. The study's findings indicated that the ligand "Irinotecan" docked well and made powerful binding with the active sites of all the proteins. The results for EGFR, MMP, AKT1, BRAF, TNKS-1, and TNKS-2 were labelled by the protein codes 1M17, 2DDY, 3O96, 4MNE, 5ECE, and 6KRO, respectively (table 1). The protein targets such as EGFR, MMP, AKT1, BRAF, TNKS-1, and TNKS-2 found in this study is overexpressed is a therapeutic target for the management of malignant tumours (47-58). IRT attaches to the topoisomerase I-DNA complex and prevents DNA strand breaks from being relegated and causes cytotoxicity [43, 45, 46]. The current investigation found that irinotecan interacted well with all of the targeted proteins, with the order of binding being AKT1>TNKS-2>MMP>EGFR>TNKS-1>BRAF. The docking scores of the proteins are as follows: -8.70,-7.62,-6.52,-5.68,-4.34, and-3.54. A high binding affinity option is the ligand with the lowest binding energy. In this investigation, AKT1 and TNKS-2 had greater binding affinities to Irinotecan than MMP, EGFR, TNKS-1, and BRAF proteins. AKT1, TNKS-2, MMP, EGFR, TNKS-1, and BRAF had Glide evdv values of-60.46,-36.72,-47.15,-42.01,-42.47, and-34.44, respectively (table 1).
Glide energy values f were-4.05,-3.18,-8.48,-9.05,-6.41, and-4.45. Following that, the glide energies of proteins such as AKT1, TNKS-2, MMP, EGFR, TNKS-1, and BRAF were calculated, and the results are-38.87,-39.90,-55.63,-51.06, and-48.88, respectively. The target proteins amino acids in particular, displayed excellent interaction with Irinotecan via hydrogen bonding, pi-pi bonding, and polar interactions. Table 1 shows the hydrogen bonds and pi-pi interactions formed by target protein amino acids and Irinotecan. Each target protein's docking scores with "Irinotecan" were compared. Interestingly, the drug "Irinotecan" showed excellent binding interactions and affinities with all six proteins that are specific for colon cancer, with the following order of binding interactions: AKT1>TNKS-2>MMP>EGFR>TNKS-1>BRAF. By considering the ligand and certain target areas as flexible conformations, this approach was able to determine the binding free energy between each target and ligand. IRT demonstrated the least amount of binding energy to AKT1 of all the examined proteins. Additionally, compared to other targets, AKT1 is one of the targets in cancer research that has received the most attention. Several anticancer candidates that target AKT1, such as capivasertib (AZD5363), ipatasertib (RG7440), and MK-2206, are currently undergoing clinical trials [72]. MK-2206, one of these contenders, has demonstrated good outcomes in the treatment of people with colorectal cancer [73].
Evaluation of the docking programme
The docking procedure's accuracy was demonstrated by the scoring function's analysis of the binding conformations of the ligand and target proteins based on their lowest energy positions. The experimental binding as measured by X-ray crystallography and the Glide/docking score are equivalent. The investigation's conclusions were calculated using hydrogen bonding interactions and the root mean square deviation (RMSD) between the anticipated and actual X-ray crystallographic conformations. By removing the co-crystallised ligand from its active site, "Irinotecan" was docked with its binding site to demonstrate the extreme precision (XP) docking mode [73]. The docking scores of each target protein with "Irinotecan" were compared. Surprisingly, "Irinotecan" showed substantial binding contacts with each of the six proteins believed to be responsible for colon cancer, and their interactions were conducted in the order shown below: AKT1>TNKS-2>MMP>EGFR>TNKS-1>BRAF.
Table 1: Irinotecan's molecular docking score, glide evdw (Van der Waals energy), ecoul (Coulomb energy), interacting residues, kind of interaction, and docking score were determined using schrodinger’s glide software (version 2018-1). Where the letters HB stand for hydrogen bonds and Pi-Pi for-bonds
Compound | Protein | Docking score | Glide evdw | Glide ecoul | Glide energy | Interacting residues/type (HB/Pi-Pi) |
Irinotecan | 1M17 | -05.68 | -42.01 | -09.05 | -51.06 | LYS704, ASP831 and HOH |
2DDY | -06.52 | -47.15 | -08.48 | -55.63 | HIS120, GLU121 and THR141/HIS124 and HIS130 | |
3O96 | -08.70 | -60.46 | -04.05 | -64.51 | TRP80 | |
4MNE | -03.54 | -34.44 | -4.45 | -38.87 | ASN78, LYS97, SER150, SER194, LYS192, LEU197 and HOH | |
5ECE | -04.34 | -42.47 | -6.41 | -48.88 | LYS1195, TYR1203/PHE1188 | |
6KRO | -07.62 | -36.72 | -3.18 | -39.90 | ARG1047 and TYR1071 |
Lipinski rule and pharmacokinetic (ADME) parameters
The ADME characteristics of the test drug "Irinotecan" were further evaluated using the QikProp module of the Schrodinger software. Examples of Lipinski characteristics include molecular weight, hydrogen bond donor (HBD), hydrogen bond acceptor (HBA), partition coefficient (QPlogP (O/W), and the rule of five. The expected values for each of these parameters were, accordingly, 586.68 (500), 1 (5), 12.75 (10), and 3.41 (5), and the rule of five is one (0) (table 2). Except for a tiny change with HBA, the estimated Lipinski values were below the limit stated in parentheses.
Aqueous solubility (QPlogS), predicted IC50 for HERG K+channel blockage (QPlogHERG), blood and brain partition coefficient (QPlogBB), qualitative human oral absorption (PHOA), and gastrointestinal system barrier and cell permeability in nm/s (QPPCaco) were all calculated. The following values are equivalent: -6.5 (-6.50 to 0.50),-7.01 (-05),-1.32 (-03 to 1.20), 65 (>80 high, 25 poor), and 68 (>500 high, 25 poor) (table 3). The levels of irinotecan were within the permitted range and did not exceed the limit according to the pharmacokinetic characteristics of the drug. The complete experiment's findings demonstrated that irinotecan complied with all ADME and Lipinski's rule requirements and exhibited a consistent interaction with the target protein.
Table 2: The values that the lipinski rule-based QikProp module of schrodinger predicted for irinotecan. Molecular weight, abbreviated as M. W., the HB-Hydrogen bond, and the expected octanol/water partition coefficient logP together with the HB-Hydrogen bond and QPLogP (O/W)
Factors of lipinski rule of 5 | |||||
Name of the compound | M. W. (<500) | HB-Donor (<05) | HB-Acceptor (<10) | QPlogP (O/W) (<05) | Rule of 5 (00) |
Irinotecan hydrochloride | 586.68 | 01 | 12.75 | 03.41 | 01 |
Table 3: Irinotecan’s ADME values were predicted using a schrodinger QikProp module. Where QPlogS stands for aqueous solubility, QpHERG for expected IC50 for blocking HERG K+channels, QPlogBB for predicted blood and brain partition coefficient, PHOA for predicted oral absorption, and QPPCaco for predicted gut-blood barrier and cell permeability in nm/s, respectively
Pharmacokinetic (ADME) properties | |||||
Compound | QPlogS (-06.50 to 0.50) |
QpHERG (<-05) |
QPlogBB (-03 to 01.20) |
PHOA (>80 high,<25 poor) |
QPPCaco (>500 high,<25 poor) |
Irinotecan | -06.5 | -07.01 | -01.32 | 65 | 68 |
The current work used Schrodinger Maestro to examine the molecular interactions and pharmacokinetics of Irinotecan with the chosen proteins AKT1, TNKS-2, MMP, EGFR, TNKS-1, and BRAF. Both binding affinity and ADME features were examined using Schrodinger's GLIDE and QikProp programmes. The results of the investigation showed that the individual proteins had strong hydrogen bonds, polar bonds, and pi-pi bonds with each other for binding. Interestingly, the expected scores for Irinotecan using Lipinski's rule and pharmacokinetic (ADME) characteristics were within satisfactory limits. As a result, the drug Irinotecan efficiently and at a low energy level inhibits the target colon cancer proteins AKT1, TNKS-2, MMP, EGFR, TNKS-1, and BRAF. Irinotecan's interactions with the six proteins were more energetic in the following order: AKT1>TNKS-2>MMP>EGFR>TNKS-1>BRAF. Additionally, compared to MMP, EGFR, TNKS-1, and BRAF proteins, the proteins AKT1 and TNKS-2 had higher binding affinities to irinotecan. In this current study, we identified the higher docking score of irinotecan with extracellular colorectal cancer target proteins. This study is recommended for the continuous effort of researchers towards the selected extracellular colorectal cancer target proteins that are most suitable with irinotecan hydrochloride as a candidate for pharmaceutical formulation.
The products selected in this study are those that are often and predominately used in our nation and field of study. Because we don't aim to use these items as a venue for any lawsuit but rather for the development of knowledge, The authors and the product's makers have no financial ties to one another. Additionally, the study was not paid for by the production business; rather, the writers paid for it themselves.
AKT1-Serine/threonine protein kinase, TNKS–tankyrases, MMP-Matrix metalloproteinase, EGFR-Epidermal growth factor receptor, and BRAF, Irinotecan-IRT, Checkpoint kinase 1-Chk1, inducible nitric oxide synthase–iNOS, GAPDH-Glyceralde-3-phosphate dehydrogenase, MAPK3-Mitogen-activated protein kinase 3, PARP-poly (ADP-ribosyl) polymerase 1, TP53-Tumour suppressor p53, IRT-Irinotecan, ADME-Absorption, distribution, metabolism, excretion, HBD-hydrogen bond donor, HBA-hydrogen bond acceptor, RMSD-root mean square deviation.
This research did not receive a specific grant from any funding agencies.
The authors declare no conflict of interest.
All the authors have contributed equally.
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