AN UPDATED STATUS OF ALANINE RACEMASE INHIBITORS: A REVIEW
HTML Full TextAN UPDATED STATUS OF ALANINE RACEMASE INHIBITORS: A REVIEW
P. Rathee, S. Saini and A. Khatkar *
Department of Pharmaceutical Sciences, M. D. University, Rohtak, Haryana, India.
ABSTRACT: Enzyme Alanine racemase is well known for performing the predominating role in mycobacterium cell wall synthesis. D-alanine provided by Alanine racemase serves as a peptidoglycan precursor, utterly vital for maintaining the growth and integrity of the cell wall. The lipid-rich mycobacterium cell wall is prevalent amidst prokaryotes with immense potential of becoming a therapeutic target for new drug discovery. The imperative role of Alanine racemase in mycobacterium cell wall synthesis implies that its inhibition is of utmost priority in dealing with various pathogenic infections. Interference with metabolic processes, lack of specificity, and cellular toxicity caused by several known inhibitors prompted renewed efforts by researchers to discover new and improved inhibitors with better therapeutic indexes. This paper provides an overview of the updated status of reported Alanine racemase inhibitors based on shreds of evidence in literature so that more precise inhibitors could be explored, designed, and identified to rationalize the overall drug discovery process, which will be true serendipity for the mankind.
Keywords: In-situ gel, Acyclovir, Anti-viral, HPMC E50 LV, Pluronic F-127
INTRODUCTION: Microorganisms are defined as infectious agents of microscopic size, including bacteria, fungi, protozoan and viruses, responsible for causing various types of infections. To deal with infectious agents, there is an urgent need for an antimicrobial agent that antagonizes the action of infection-causing microbe 1. The discovery of antimicrobial drugs conferred huge benefits on human health and changed the fate of mankind dramatically. Penicillin was the first antibiotic discovered by Alexander Fleming, which proved to be a boon in curing infectious diseases.
As a result, antibiotics were regarded as wonder drugs and generally used to manage infection caused by pathogens. However, a large number of people are reliant on antibiotics for the maintenance and improvement of health. Antibiotics have become one of the most commonly prescribed pharmaceutical drugs for curing various infections. This ultimately leads to the development of drug resistance that may often associate with careless use and overconsumption, which is a key issue of concern for the researchers 2.
Now the greatest challenge of the twenty-first century is the development of drug resistance responsible for causing immense human suffering. The resistance problem urges iterated effort to strive for antibacterial agents efficacious against pathogenic bacteria rebellious to commercial antibiotics 3, 4.
This highlights the immediate call for upgraded antibacterial agents with advanced mechanisms for clinical application 5, 6.
Potential Target Sites for the Search of Futuristic Antimicrobials: The treatment of infectious diseases becomes knotty as microbial resistance shoots up at odds with antimicrobial agents. Drugs that destroy microbes prevent their proliferation, and pathogenic actions have dissimilar structures, inconsistent affinity towards the target site, and disparate spectrum of activity with various mechanisms of action. The advancement in bacterial genomics has greatly altered the antimicrobial therapeutic environment, and many potential targets stand by 7, 8.
Attempts have been made to reveal unhackneyed antimicrobial agents, and many researchers have taken steps to disclose ultra-modern drugs acting via advanced mechanisms or against the latest target sites from natural sources 9. The probable targets for searching for new antimicrobial compounds may be focused on the following mechanisms 8, which are depicted in Fig. 1 as follows.
FIG. 1: POTENTIAL TARGET SITES FOR ANTIMICROBIAL AGENTS
Inhibition of Microbial Cell Wall Synthesis: Bacterial cells are surrounded by a cell wall made of a peptidoglycan network constitutes an essential component of the cell wall, serves as a perfect site for drug design since corresponding biosynthetic process are lacking in mammalian hosts. Blockage of bacterial cell wall synthesis is of paramount importance for the action of antimicrobials. The probable target sites 10-13, 8 in cell wall synthesis are summarized in Fig. 2 may be.
FIG. 2: TARGET SITES IN CELL WALL SYNTHESIS
Alanine racemase Promising Target for Antimicrobial agents: Alanine racemase (Alr, EC 5.1.1.1) is a pyridoxal-5- phosphate (PLP) dependent homodimeric enzyme that brings about reversible racemization of L- alanine and D- alanine. This bacterial enzyme execute predominating role in cell wall synthesis of bacteria 14, 15 by providing D- alanine (D-ala) which serve as a key molecule for the biosynthesis of peptidoglycan network of mycobacterial cell wall; hence its inhibition has been reported to be fatal to pathogen viability in the deprivation of D-alanine supplementation 16, 17. The lipid-rich mycobacterial cell wall is common amidst prokaryotes, making Alanine racemase a putative target for the design and development of pharmacologically active drug 18-21. D-alanine provided by Alanine racemase is vital for maintaining cell wall growth and integrity. D-alanine acts as a pivotal precursor for peptidoglycan biosynthesis in bacterial cell walls via D-ala-D-ala formed by the enzyme D-ala-D-ala ligase 22. This manifests how the inhibition of alanine racemase is importunate. This paper provides an overview of the updated status of reported Alanine racemase inhibitors based on shreds of literature. The products derived from natural sources have been recognized to play a significant role by being the lead molecules to be selected as potential candidates for drug development. Various researchers have synthesized derivatives of different scaffolds and evaluated them for Alanine racemase properties, summarized in Table 1.
TABLE 1: REPORTED INHIBITORS OF ENZYME ALANINE RACEMASE
Sr. no. | Reported Inhibitors | Research Findings |
1. |
D-cycloserine (DCS)
|
Sources: Streptomyces garyphalus or S. orchidaceus. Dissociation followed by subsequent rearrangement of DCS with substituted oxime unriddle alanine racemase reactivation in cellular pool. DCS, earlier proved to be an effective competitive inhibitor of enzyme, unfit for S. aureus Alr due to the absence of conformation essential for the molecule to bound with substrate region 23-25.
Enzyme kinetics- Km= 4.6 * 10-4 M (D-alanine) Km= 9.7 * 10-4 M (L-alanine) |
2. | O-carbamyl-D-serine | Sources: Streptococcus faecalis
Determination of primary site of action of O-carbamyl-D-serine on Alr on the basis of UDP-NAC muramyl-L-ala-D-glu-L-lys accumulation and in the absence of D-ala-O-carbamyl-D-serine 26, 27 Enzyme kinetics- Km= 4.8 * 10-4 M (D-alanine), Km= 6.8 * 10-3 M (L-alanine) |
3. |
Alafosfalin
|
Sources : Synthetic L-alanine analog
Contains two parts-AlaR inhibitor fosfalin and carrier alanine moiety Based upon alafosfalin formation of external aldimine with PLP cofactor, phosphonate group rendered catalytic residues inaccessible for catalysis. Variable activity against gram positive and negative bacterial strains. Phosphonodipeptide with antibacterial properties 27-29. |
4. | X= Cl, F Halovinylglycine | Sources: synthesized from N-(benzyloxycarbonyl)-vinylglycine methyl ester which in turn obtained from methionine.
Irreversible inhibitor of Alr obtained from E.coli. 27,30 D-chlorovinylglycine: MIC value- 32 µg/mL (S.aureus) 64 µg/mL (S.faecalis)
|
5. | (1-aminoethyl) boronic acid | Structural analog of alanine
Showed time-dependent inhibitory activity towards Alr isolated from B. stearothermophillus Competitive inhibitor of D-alanine at D-alanine binding sites 27, 31
|
6. | 1-aminocyclopropane phosphonate | Slow but potent inhibitor of Alr obtained from B. stearothermophillus strain.
Second order rate constant: <150M-1S-1 Km/Ki ratio: 200027,32 |
7. | Hydroquinone | Sources: Blueberry, pears, broccoli, onions, tea, coffee, beer, red wine, wheat and cereals etc.
Alr-2 inhibitors found to be active against Aeromonas hydrophila IC50 value= 11.39 µM MIC value= 25 µg/mL Potent inhibitor of Alr isolated from Streptococcus iniae HNM-118,33 |
8. | Homogentisic acid | Sources: Aebutus unedo (strawberry-tree), honey, Xanthomonas campestris pv. Phaseoll, Yarrownia lipolytica
Alr-2 inhibitors found to be active against Aeromonas hydrophila IC50 value= 0.2 µM MIC value= 1.73 µg/mL Potent inhibitor of Alr isolated from Streptococcus iniae HNM-118,33,34 |
9. | Thiadiazolidionone | Inhibitory activity against M. tuberclosis and M. smegmatis Alr with IC50 value ranging from <0.03 to 28 µM and 23 to >150 µM respectively 35. |
10. | 1-aminoethyltetrazole (Tetrazole containing bioisoster scaffold) | C-terminal 1-aminoethyltetrazole containing di and oligopeptides synthesized by solid phase peptide coupling technique were identified as novel and potential alanine racemase inhibitors 29. |
11. | Quercetin | Sources: Apples, berries, broccoli, grapes, citrus fruits, cherries, green tea, coffee, red wine, onions and capers etc.
M.W= 302.24 IC50 value= 0.33 µM Docking score= -102.489kcal/mol Potent inhibitor of AlaR Effective drug in the treatment of pulmonary tuberculosis 18,36 |
12. | Patulin | Sources: Apple, peach, grapes, fruit juices, several species of Aspergillus, Pencillium and Byssochlamys 18,37-39
M.W= 154.12 IC50 value= 14.7(0.27) µM MIC value= 20(0.89) µg/mL
|
13. | Propyl gallate | M.W= 212.2
IC50 value=8.6( 0.5) µM 18
|
14. | Haematoxylin | Sources: Heartwood of the logwood tree Haematoxylum campechianum 40
M.W= 302.29 IC50 value=15.6( 0.23) µM
|
15. | β, β, β-triflouroalanine | Exhibited time-dependent inhibition of against AlaR obtained from S. typhimurium and B. stearothermophillus 27
Ki values = 65 ±10 and >100mM Kinact = 0.08± 0.02 and >2.0min-1 |
In drug discovery, computer-aided drug design (CADD) offers effective and reliable methodologies for lead optimization, virtual screening, and designing new drug candidates. Molecular docking is a computational drug design approach that provides insights into molecular recognition 41. In an attempt to conduct wet laboratory experiments smoothly and effectively, this method is useful for predicting the compound architecture, preferred orientation and con-formation (binding pose), interaction, and binding geometry of small ligands into the catalytic pockets of biomolecular targets based on docking score function 42. Based on literature evidence, molecular docking studies of some reported Alanine racemase Inhibitors have been presented in Table 2.
TABLE 2: REPORTED MOLECULAR DOCKING-BASED STUDIES OF ALANINE RACEMASE INHIBITORS
Sr. no. | Reported Inhibitors | Research Findings |
1 | 3-((5-(4-chlorophenyl)-1,3,4-oxadiazol-2-yl) methyl) thiazolidine-2,4-dione | PDB code: 1XFC
Docking software- Schrodinger 43 IC50 value =13.1µM Number of H-bonds- 6 Salt bridge interaction- Arg228
|
2 | 2-(2-chloro-4-nitrophenyl)-4-(2,3-di hydro-1H-inden-2-yl)-1,2,4-thiadiazo- lidine-3,5-dione | PDB code: 1XFC
IC50 value=0.05µM Number of H-bonds-3 π-π stacking- His172, Tyr175 43
|
3 | Ricinoleic acid | PDB code: 3E5P
Docking software- AutoDock Docking score: -7.81, Number of H-bonds-5 Amino acid residues – Ser207, Val225, Tyr356, Tyr267. Bioavailability score: 0.56 with high GI absorption 44 |
4 | 4-[4-(propan-2-yl)phenyl]-2-{4-[(trifluoromethyl) sulfanyl]phenyl}-1,2,4-thiadiazolidine-3,5-dione | PDB code: 1XFC, Resolution: 1.9 Å
Docking software- Schrodinger Induced fit docking- Desmond Induced fit docking results revealed that Lys42, Tyr46, Tyr175 and Tyr364 residues were responsible for the stabilization of inhibitor-protein complexes 45. Binding energy value = -38.88 kcal/mol IC50 value=0.17 µM |
5 | Patulin | PDB code: 2rjh.1.A
Docking software: AutoDock Compound possessed inhibitory activity against Aeromonas hydrophilla 18 IC50 value=0.62 µM against Caco-2 cells Also exhibits strong cytotoxic effects and reduce the viability of HeLa cells upto 99% at 6.25 µg/ml. |
6 | Ganomycin B | PDB code: 2RJG
Docking software: AutoDock4 Predicted Xscore Ki = 0.15 µM Compound forms H-bonds with residues Arg280, Tyr274 and prosthetic group PLP. Compound had narrow access to the active site 46 |
7 | D-cycloserine (DCS) scaffold
4-benzyl-2-ethyl-1,2,4-thiadiazolidine-3,5-dione |
PDB code: 1XFC-A (Mtb-Alr)
Software: MODELLER (Homology modelling) Docking software: AutoDock Vina 15 Molecular Volume: 205.03
|
8 | Propionate | PDB code: 1SFT
Program: LigBuilder (to generate phrmacophore model) Non-covalent inhibitor fits only two features of the dynamic pharmacophore model with no excluded volumes, made the compound insufficient in order to be oriented on to the model with excluded volumes 47 |
CONCLUSION: The imperative role of alanine racemase in mycobacterium cell wall synthesis implies that its inhibition is of utmost priority in dealing with various pathogenic infections. This paper provides an overview of structural information on variously reported inhibitors of alanine racemase based on convincing shreds of evidence from literature so that more precise inhibitors could be explored, designed and identified to rationalize the overall drug discovery process which will be true serendipity for the mankind.
Ethics Approval and Consent to Participate: Not applicable.
Consent for Publication: Not applicable.
Funding: None.
ACKNOWLEDGEMENT: We would like to acknowledge and express our obligations to our Dean, Faculty of Pharmaceutical Sciences, Baba Mastnath University, Asthal Bohar, Rohtak and Department of Pharmaceutical Sciences, Maharshi Dayanand University, Rohtak, for providing necessary help.
CONFLICT OF INTEREST: The authors declare no conflict of interest, financial or otherwise.
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How to cite this article:
Rathee P, Saini S and Khatkar A: An updated status of alanine racemase inhibitors: a review. Int J Pharm Sci & Res 2023; 14(8): 3611-18. doi: 10.13040/IJPSR.0975-8232.14(8).3611-18.
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English
IJPSR
P. Rathee, S. Saini and A. Khatkar *
Department of Pharmaceutical Sciences, M. D. University, Rohtak, Haryana, India.
anuragpharmacy@gmail.com
03 November 2022
09 January 2023
05 May 2023
10.13040/IJPSR.0975-8232.14(8).3611-18
01 August 2023