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Imran, M.;  Arora, M.K.;  Chaudhary, A.;  Khan, S.A.;  Kamal, M.;  Alshammari, M.M.;  Alharbi, R.M.;  Althomali, N.A.;  Alzimam, I.M.;  Alshammari, A.A.; et al. MmpL3 Inhibition in Thearaphy of Tuberculosis. Encyclopedia. Available online: https://encyclopedia.pub/entry/36042 (accessed on 16 November 2024).
Imran M,  Arora MK,  Chaudhary A,  Khan SA,  Kamal M,  Alshammari MM, et al. MmpL3 Inhibition in Thearaphy of Tuberculosis. Encyclopedia. Available at: https://encyclopedia.pub/entry/36042. Accessed November 16, 2024.
Imran, Mohd., Mandeep Kumar Arora, Anurag Chaudhary, Shah Alam Khan, Mehnaz Kamal, Manal Mutlaq Alshammari, Raghad Mohammad Alharbi, Nuha Abdullah Althomali, Ibrahim Mohammed Alzimam, Abdullah Ayed Alshammari, et al. "MmpL3 Inhibition in Thearaphy of Tuberculosis" Encyclopedia, https://encyclopedia.pub/entry/36042 (accessed November 16, 2024).
Imran, M.,  Arora, M.K.,  Chaudhary, A.,  Khan, S.A.,  Kamal, M.,  Alshammari, M.M.,  Alharbi, R.M.,  Althomali, N.A.,  Alzimam, I.M.,  Alshammari, A.A.,  Alharbi, B.H.,  Alshengeti, A.,  Alsaleh, A.A.,  Alqahtani, S.A., & Rabaan, A.A. (2022, November 23). MmpL3 Inhibition in Thearaphy of Tuberculosis. In Encyclopedia. https://encyclopedia.pub/entry/36042
Imran, Mohd., et al. "MmpL3 Inhibition in Thearaphy of Tuberculosis." Encyclopedia. Web. 23 November, 2022.
MmpL3 Inhibition in Thearaphy of Tuberculosis
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This entry is adapted from the peer-reviewed paper 10.3390/biomedicines10112793

Tuberculosis (TB) is a contagious bacterial illness known to humankind since ancient times. The causal microorganism of TB is Mycobacterium tuberculosis (Mtb). Lung or pulmonary TB is the most common form, but Mtb also affects other body parts. TB does not spare any age group and is omnipresent worldwide. Most TB patients remain asymptomatic (latent TB) and non-contagious. However, approximately 10% of latent TB cases may advance to active TB (active or symptomatic TB). Some usual symptoms of active TB comprise continuing chronic cough, hemoptysis, night sweating, and weight loss. Active TB is associated with a high mortality rate if left untreated. The 2021 TB report of the World Health Organization (WHO) states that TB is one of the top 10 reasons for global deaths, about one-quarter of the global population is affected by Mtb, and the global burden of TB is expected to increase due to the COVID-19 pandemic.

tuberculosis drug-resistance Mmpl3 SQ109 clinical studies patent

1. Mycobacterial Membrane Protein Large 3 (MmpL3)

MmpL is a transport protein (trehalose monomycolate flippase) in Mtb. There are about 13 MmpLs, but only MmpL3 is essential in Mtb [1]. The physiological role, structure, and properties of MmpL3 are well described in the literature [1][2][3][4][5][6]. Mycolic acid (MA) is an essential component of the MA-based hydrophobic outer cell wall of Mtb [1][2][3][4][5][6]. MA is produced in the cytoplasm of the Mtb cell. In the cytoplasm of the Mtb, the type I polyketide synthase 13 (Pks13) drives the interaction of MA and trehalose to produce trehalose monomycolate (TMM). MmpL3 is located at the plasma membrane of the Mtb. MmpL3 is responsible for transporting TMM from the cytoplasm to the inner membrane of the Mtb. In the inner membrane, Ag85 mediates the conversion of TMM to trehalose dimycolate (TDM) and trehalose. The trehalose returns to the cytoplasm via the SugABC-Lpqy transporter to restart this cycle. The TDM makes the covalent bond with the arabinogalactan polysaccharides to synthesize a packed and MA-based hydrophobic outer cell wall of Mtb (Figure 1).
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Figure 1. Mechanism of action of MmpL3 inhibitor (SQ109).
The MA-based hydrophobic outer cell wall of Mtb is impermeable to many chemical compounds, including antibiotics, and protects and contributes to the pathogenic success of Mtb [1][3]. Therefore, the expression of MmpL3 is essential for Mtb’s survival and pathogenicity [1][2][3][4][5][6]. The inhibitors of MmpL3 (SQ109) cause the diminution of MmpL3, which leads to the cessation of cell wall synthesis, cell division, and thevrapid death of Mtb [1][2][3][4][5][6].

2. Literature on MmpL3 Inhibitors

The literature on MmpL3 inhibitors was searched on the PubMed database using “MmpL3” as a keyword on 1 October 2022. Herein, 146 articles were provided, including 21 review articles. The summary of 12 relevant and recent review articles is mentioned in Table 1. The authors did not find an MmpL3 inhibitor-based review article discussing clinical studies on MmpL3 inhibitors (SQ109), the development of SQ109, or the patent literature of MmpL3. This aspect provides novelty to the current review article over the previously published reviews on MmpL3 inhibitors.
Table 1. Summary of relevant and recent review articles on MmpL3.
Ref. No. Year Summary of the Review Article
[1] 2020 Reviews MmpL3 (physiological role, structure, and properties) and ligands/inhibitors of MmpL3 (AU1235, ICA38, SQ109, rimonabant, SPIRO, and NITD-349).
[3] 2021 Describes MmpL3 as a drug target, different chemical classes of MmpL3 inhibitors (derivatives of indole carboxamide, pyrrole/pyrazole, quinoline/quinolone, adamantane, benzimidazole, acetamide, and spiro-compound) and different ligands of MmpL3 like ICA38 (PDB ID: 6AJJ), rimonabant (PDB ID: 6AJI), SQ109 (PDB ID: 6AJG), and U1235 (PDB ID: 6AJH).
[7] 2022 Reviews indole derivatives as MmpL3 inhibitors (NITD-349, indolamide, adamantanol analogs, and indole-2-carboxamides) and inhibitors of other anti-TB drug targets (InhA, DprE1, KasA, chorismate mutase, DNA replication, DNA gyrase, dihydrofolate reductase).
[8] 2022 Describes MmpL3 as a promiscuous drug target and also spotlights the MmpL3 inhibitors of different chemical classes (adamantyl derivatives, piperidinol derivatives, and benzimidazole derivatives). It also highlights other anti-TB drug targets (TrmD, Ag85C, GyrB, and ClpC1).
[9] 2021 Briefly explains clinical study data (NCT01785186) of SQ109 (an MmpL3 inhibitor) and comments on the improved anti-TB activity of SQ109 with MDR regimens.
[10] 2020 Talks about MmpL3, the preclinical/clinical development of MmpL3 inhibitors (BM212, THPP, SQ109, Spiro, NITD-349, NITD-304, AU1235, C215, and HC2091), and different chemical classes of MmpL3 inhibitors (derivatives of indole, benzimidazole, benzothiazole, piperidine, 4-Thiophen-2-yloxane-4-carboxamide, benzofuran, quinoline/quinolone, naphthalene, acetamide, and pyrrole).
[11] 2020 Explores the current development of MmpL3 inhibitors (ethylenediamine derivatives, carboxamide derivatives, benzothiazole amides, adamantyl ureas, pyrroles and pyrazoles, benzimidazoles, spiropiperidines, and piperidinol), along with their structure-activity relationship (SAR) and challenges in developing them. It also provides the chemical structure of many MmpL3 inhibitors (AU1235, CRS400393, BM212, THPP, spiropiperidine, TBL-140, ICA38, HC2091, BM533, BM635, rimonabant, C215, PIPD1, NITD-349, NITD-304, and SQ109,).
[12] 2020 Surveys the new targets for TB, including MmpL3 and the chemistry of MmpL3 inhibitors (design and structural features) in clinical/preclinical trials.
[13] 2020 Identified lead compounds from PubChem database targeting MmpL3 and other anti-TB drug targets by high-throughput screening.
[14] 2019 Underlines the chemical structures and designs of MmpL3 inhibitors.
[15] 2018 Highlights the target validation, discovery, hit-optimization, and SAR of MmpL3 inhibitors of different chemical classes (ethylenediamine, adamantyl ureas, phenyl pyrroles, benzimidazoles, indole carboxamides, and spiropiperidines).
[16] 2014 Discloses MmpL3 as a validated target for developing anti-TB medications. It also discloses SQ109 and BM212 as MmpL3 inhibitors.

3. Clinical Studies on MmpL3 Inhibitors

Studies [1][3][6][7][10][11][12][13][14][15][16] have disclosed the chemistry of some important inhibitors of MmpL3 (SQ109, NITD-304, NITD-349, AU1235, CRS400393, BM212, THPP, spiropiperidine, TBL-140, ICA38, HC2091, BM533, BM635, rimonabant, C215, and PIPD1). The clinical studies on MmpL3 inhibitors were searched on 1 October 2022, on the clinicaltrial.gov database [17] utilizing different keywords (SQ109 = 7 studies; No anti-TB study found for NITD-304, NITD-349, AU1235, CRS400393, BM212, THPP, spiropiperidine, TBL-140, ICA38, HC2091, BM533, BM635, rimonabant, C215, or PIPD1). A general search on PubMed was also conducted with the earlier mentioned keywords in the clinical trial and randomized controlled trial section of PubMed. Three studies were identified for the “SQ109” keyword [18][19][20], while other keywords did not produce clinical studies related to TB. The summary of clinical studies on SQ109 is provided in the SQ109 section herein.

4. SQ109

SQ109 (Synonym: NSC722041; Molecular Formula: C22H38N2; Molecular Weight: 330.55; CAS registry number: 502487-67-4; ChemSpider ID: 4438718; PubChem substance ID: 175426955; PubChem CID: 5274428; Figure 2) is a 1,2-ethylenediamine-based analog of EMB (Figure 2) [21][22]. The 1,2-ethylenediamine linker is essential for the anti-TB activity of SQ109 and EMB [23].
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Figure 2. Chemical structures of SQ109 and ethambutol.
Infectex and Sequella are developing SQ109 in partnership to treat MDR pulmonary TB [24][25]. SQ109 was developed by focusing on EMB, but they share an uncommon chemical skeleton (Figure 2) and mechanism of action. The chemical structure, synthesis, anti-TB activity, oral bioavailability, and acid stability of SQ109 were first disclosed in 2003 [21][26]. The development timeline of SQ109 is presented in Figure 3.
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Figure 3. The development timeline of SQ109.

4.1. Mechanism of Action

SQ109 demonstrates its anti-TB activity through three different mechanisms comprising inhibition of MmpL3 (Figure 1), biosynthesis of quinones (MenG and MenA), and a reduction in ATP synthesis in Mtb [24][25][26][27].

4.2. Preclinical Studies

The preclinical studies have established the efficacy of SQ109 against all forms of TB, including DS-TB, DR-TB, and the slow vegetative form of Mtb (latent-TB) [25][26] (Table 2). SQ109 has also shown activity against Aspergillus fumigatus, Candida spp., Helicobacter pylori, Haemophilus influenzae, and Streptococcus pneumoniae [25]. SQ109 presented low oral bioavailability but achieved 45-fold higher concentrations in TB murine target organs (lung and spleen) than in plasma, reduced TB-treatment time by about 25–30% in in vivo models, and exhibited synergistic effects with INH, RIF, CFZ, and BDQ [24][25][26] (Table 2).
Table 2. The anti-TB activity of SQ109 and its combinations against Mtb.
The Anti-TB Activity of SQ109 The Anti-TB Activity of SQ109 Combinations in Mice
Susceptibility Profile Assay MIC (μg/mL) Drug Regimen Log10 CFU in Lung Log Decrease
H37Rv (pan-susceptible) BACTEC ≤0.2 Two weeks
H37Rv (pan-susceptible) Alamar ≤0.39 Untreated 6.16 ± 0.02 -
Erdman (pan-susceptible) Alamar ≤0.39 INH + RIF + EMB 4.64 ± 0.23 1.52
EMB-resistant Alamar 0.78 INH + RIF + SQ109 4.46 ± 0.12 1.70
INH-resistant Alamar 0.78 Four weeks
RIF-resistant Alamar ≤0.39 Untreated 6.42 ± 0.76 -
XDR plus EMB-resistant Microbroth 0.20 INH + RIF + EMB 3.86 ± 0.14 2.56
INH + RIF + SQ109 3.26 ± 0.12 3.16

4.3. Clinical Studies on SQ109

The clinical studies on SQ109 were searched on the clinicaltrial.gov database [17] and PubMed. The summary of clinical studies on SQ109 is provided in Table 3.
Table 3. Summary of clinical studies on SQ109.
Title (Allocation; Intervention Model; Masking; Purpose) Intervention and Active Comparator (AC) NCT Number
(Status; Phase; Number Enrolled; Results; Outcome Measures)		 Sponsor/Collaborator (Location; Study Start Date (SSD); Study Completion Date (SCD); Last Update Date (LUD))
Pharmacokinetics and early bactericidal activity (EBA) of SQ109 in adult subjects with pulmonary TB
(Randomized; Parallel assignment; None (Open-label);
Treatment of TB)		 SQ109 monotherapy (75 mg, 150 mg, and 300 mg tablet daily) or a combination of RIF with SQ109 (RIF standard dose + 150 mg or 300 mg of SQ109) for 14 days; AC: RIF capsule (150 mg) NCT01218217
(Completed; 2; 90; Not available; EBA of SQ109 monotherapy and combination therapy of SQ109 with RIF)		 Michael Hoelscher and Sequella, Inc.
(South Africa; November 2010: May 2012; 14 January 2013)
Evaluation of SQ109 plus PPI in urea breath test-positive volunteers
(Not mentioned; Single group assignment; None (Open-label); Treatment of H. pylori infection)		 SQ109 (300 mg) daily for two weeks; AC: Not mentioned NCT01252108
(Withdrawn due to lack of funding: 2: 0: Not available; safety and efficacy of SQ109 against H. pylori infection in adult patients)		 Sequella, Inc.
(Not mentioned; March 2012; August 2015; 17 November 2015)
Evaluation of SQ109, high-dose RIF, and moxifloxacin in adults with smear-positive pulmonary TB in a MAMS design
(Randomized:
Single group assignment: None (Open-label): Treatment of TB)		 Combinations of SQ109 (300 mg) with RIF (10 to 35 mg/kg), INH (75 mg), PZA
(400 mg) and pyridoxine (25 mg); AC: Combination of INH, RIF, PZA, and EMB		 NCT01785186
(Completed: 2: 365; Available; Two negative sputum cultures utilizing liquid media)		 Michael Hoelscher and Sequella, Inc.
(South Africa; April 2013; March 2015; 20 September 2017)
Escalating single-dose safety, tolerability, and pharmacokinetics of SQ109 in healthy volunteers
(Randomized; Single group assignment; Quadruple (participant, care provider, investigator, outcomes assessor); Treatment of TB)		 A single oral dose of SQ109 (10 mg, 20 mg, 50 mg, 100 mg, 200 mg, 300 mg, and the combination of fatty food with 300 mg of SQ109); AC: Placebo NCT01585636
(Completed; 1; 62; Not available; Safety and pharmacokinetics of single dose of SQ109 for seven days)		 Sequella, Inc. and Quintiles, Inc.
(United States; September 2006; February 2007; 19 August 2013)
Dose escalation study of SQ109 in healthy adult volunteers
(Randomized; Parallel assignment; Double (participant, investigator); Treatment of MDR-TB)		 SQ109 (75 mg and 150 mg) daily for 14 days and SQ109 (150 mg) daily on days 1–5, 9, and 14; AC: Placebo NCT00866190
(Completed; 1; 10; Not available; Safety and tolerability evaluation of SQ109)		 National Institute of Allergy and Infectious Diseases (NIAID)
(United States; April 2009; November 2009; 6 November 2011)
Phase IC study of safety and PK of SQ109 300 mg daily
(Randomized; Parallel assignment; Triple (participant, investigator, outcomes assessor); Treatment of TB)		 A single dose of SQ109 (300 mg) daily for two weeks; AC: Placebo NCT01358162
(Completed: 1: 10: Not available: Safety and tolerability evaluation of SQ109)		 NIAID
(United States; November 2010; April 2011; 14 May 2013)
Effects of SQ109 on QTc interval in healthy subjects
(Randomized; Crossover assignment; None (Open-label); Treatment of TB)		 Oral SQ109 (300 mg or 450 mg daily) for seven days; AC: Placebo NCT01874314
(Withdrawn due to undisclosed reason; 1; 0; Not available; Effect of SQ109 on QTc interval)		 NIAID
(United States;
Not available; December 2015; 24 March 2014)

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Subjects: Infectious Diseases
Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Mohd. Imran
,
Mandeep Kumar Arora
,
Anurag Chaudhary
,
Shah Alam Khan
,
Mehnaz Kamal
,
Manal Mutlaq Alshammari
,
Raghad Mohammad Alharbi
,
Nuha Abdullah Althomali
,
Ibrahim Mohammed Alzimam
,
Abdullah Ayed Alshammari
,
Bashair Hamed Alharbi
,
Amer Alshengeti
,
Abdulmonem A. Alsaleh
,
Shayea A. Alqahtani
,
Ali A. Rabaan
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Update Date: 24 Nov 2022
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