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Fernandez-Santamaria R, Ariza A, Bogas G, Salas M, Calvo-Serrano S, Frecha C, Mayorga C, Torres MJ, Fernandez TD. Involvement of autologous myeloid dendritic cells in the evaluation of immediate hypersensitivity reactions to betalactams. Clin Immunol 2024; 262:110166. [PMID: 38432423 DOI: 10.1016/j.clim.2024.110166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 02/01/2024] [Accepted: 02/26/2024] [Indexed: 03/05/2024]
Abstract
BACKGROUND Amoxicillin (AX) and clavulanic acid (CLV) are the betalactam antibiotics (BLs) most used to treat bacterial infections, although they can trigger immediate hypersensitivity reactions (IDHRs). The maturation analysis of monocyte-derived dendritic cells (moDCs) and their capacity to induce proliferative response of lymphocytes are useful to test the sensitisation to a drug, although without optimal sensitivity. Nevertheless, this can be improved using directly isolated DCs such as myeloid DCs (mDCs). METHODS mDCs and moDCs were obtained from 28 allergic patients (AP), 14 to AX, 14 to CLV and from 10 healthy controls (HC). The expression of CCR7, CD40, CD80, CD83, and CD86 was analysed after stimulation with both BLs. We measured the capacity of these pre-primed DCs to induce drug-specific activation of different lymphocyte subpopulations, CD3+, CD4+, CD8+, CD4+Th1, and CD4+Th2, by flow cytometry. RESULTS Higher expression of CCR7, CD40, CD80, CD83, and CD86 was observed on mDCs compared to moDCs from AP after stimulating with the culprit BL. Similarly, mDCs induced higher proliferative response, mainly of CD4+Th2 cells, compared to moDCs, reaching up to 67% of positive results with AX, whereas of only 25% with CLV. CONCLUSIONS mDCs from selective AP efficiently recognise the culprit drug which trigger the IDHR. mDCs also trigger proliferation of lymphocytes, mainly those with a Th2 cytokine pattern, although these responses depend on the nature of the drug, mimicking the patient's reaction.
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Affiliation(s)
- Ruben Fernandez-Santamaria
- Allergy Research Group, IBIMA Plataforma BIONAND, Málaga, Spain; Departamento de Medicina, Universidad de Málaga-UMA, Málaga, Spain
| | - Adriana Ariza
- Allergy Research Group, IBIMA Plataforma BIONAND, Málaga, Spain; Allergy Unit, Hospital Regional Universitario de Málaga-ARADyAL, Málaga, Spain.
| | - Gador Bogas
- Allergy Research Group, IBIMA Plataforma BIONAND, Málaga, Spain; Allergy Unit, Hospital Regional Universitario de Málaga-ARADyAL, Málaga, Spain
| | - Maria Salas
- Allergy Research Group, IBIMA Plataforma BIONAND, Málaga, Spain; Allergy Unit, Hospital Regional Universitario de Málaga-ARADyAL, Málaga, Spain
| | - Silvia Calvo-Serrano
- Allergy Research Group, IBIMA Plataforma BIONAND, Málaga, Spain; Departamento de Medicina, Universidad de Málaga-UMA, Málaga, Spain
| | - Cecilia Frecha
- Allergy Research Group, IBIMA Plataforma BIONAND, Málaga, Spain
| | - Cristobalina Mayorga
- Allergy Research Group, IBIMA Plataforma BIONAND, Málaga, Spain; Allergy Unit, Hospital Regional Universitario de Málaga-ARADyAL, Málaga, Spain
| | - Maria Jose Torres
- Allergy Research Group, IBIMA Plataforma BIONAND, Málaga, Spain; Departamento de Medicina, Universidad de Málaga-UMA, Málaga, Spain; Allergy Unit, Hospital Regional Universitario de Málaga-ARADyAL, Málaga, Spain
| | - Tahia Diana Fernandez
- Allergy Research Group, IBIMA Plataforma BIONAND, Málaga, Spain; Departamento de Biología Celular, Genética y Fisiología, Universidad de Málaga-UMA, Málaga, Spain
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2
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Balcazar-Ochoa LG, Ventura-Martínez R, Ángeles-López GE, Gómez-Acevedo C, Carrasco OF, Sampieri-Cabrera R, Chavarría A, González-Hernández A. Clavulanic Acid and its Potential Therapeutic Effects on the Central Nervous System. Arch Med Res 2024; 55:102916. [PMID: 38039802 DOI: 10.1016/j.arcmed.2023.102916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 09/28/2023] [Accepted: 11/09/2023] [Indexed: 12/03/2023]
Abstract
Clavulanic acid (CLAV) is a non-antibiotic β-lactam that has been used since the late 1970s as a β-lactamase inhibitor in combination with amoxicillin, another ß-lactam with antibiotic activity. Its long-observed adverse reaction profile allows it to say that CLAV is a well-tolerated drug with mainly mild adverse reactions. Interestingly, in 2005, it was discovered that β-lactams enhance the astrocytic expression of GLT-1, a glutamate transporter essential for maintaining synaptic glutamate homeostasis involved in several pathologies of the central nervous system (CNS). This finding, along with a favorable pharmacokinetic profile, prompted the appearance of several studies that intended to evaluate the effect of CLAV in preclinical disease models. Studies have revealed that CLAV can increase GLT-1 expression in the nucleus accumbens (NAcc), medial prefrontal cortex (PFC), and spinal cord of rodents, to affect glutamate and dopaminergic neurotransmission, and exert an anti-inflammatory effect by modulating the levels of the cytokines TNF-α and interleukin 10 (IL-10). CLAV has been tested with positive results in preclinical models of epilepsy, addiction, stroke, neuropathic and inflammatory pain, dementia, Parkinson's disease, and sexual and anxiety behavior. These properties make CLAV a potential therapeutic drug if repurposed. Therefore, this review aims to gather information on CLAV's effect on preclinical neurological disease models and to give some perspectives on its potential therapeutic use in some diseases of the CNS.
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Affiliation(s)
| | - Rosa Ventura-Martínez
- Farmacology Department, Faculty of Medicine, Universidad Nacional Autónoma de México, Mexico City, Mexico.
| | | | - Claudia Gómez-Acevedo
- Farmacology Department, Faculty of Medicine, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Omar Francisco Carrasco
- Farmacology Department, Faculty of Medicine, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Raúl Sampieri-Cabrera
- Phyisiology Department, Faculty of Medicine, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Anahí Chavarría
- Experimental Medicine Research Unit, Faculty of Medicine, Universidad Nacional Autónoma de México, Mexico City, Mexico
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3
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Saini R, Kumari S, Singh A, Mishra A. From nature to cancer therapy: Evaluating the Streptomyces clavuligerus secondary metabolites for potential protein kinase inhibitors. J Cell Biochem 2024; 125:59-78. [PMID: 38047468 DOI: 10.1002/jcb.30501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 10/31/2023] [Accepted: 11/06/2023] [Indexed: 12/05/2023]
Abstract
The study aimed to evaluate the antioxidant, protein kinase inhibitory (PKIs) potential, cytotoxicity activity of Streptomyces clavuligerus extract. DPPH assay revealed a robust free radical scavenging capacity (IC50 28.90 ± 0.24 µg/mL) of organic extract with a maximum inhibition percentage of 61 ± 1.04%. PKIs assay revealed the formation of a whitish bald zone by S. clavuligerus extracts which indicates the presence of PKIs. The cytotoxicity activity of organic fraction of extract through Sulforhodamine B assay on MCF-7, Hop-62, SiHa, and PC-3 cell lines demonstrated the lowest GI50 value against the MCF-7 cell line followed by the PC-3 cell line, showing potent growth inhibitory potential against human breast cancer and human prostate cancer cell line. HR-LCMS analysis identified multiple secondary metabolites from the organic and aqueous extracts of S. clavuligerus when incubated at 30°C under 200 rpm for 3 days. All the secondary metabolites were elucidated for their potential to inhibit RTKs by molecular docking, molecular dynamic simulation, MM/GBSA calculations, and free energy approach. It revealed the superior inhibitory potential of epirubicin (Epi) and dodecaprenyl phosphate-galacturonic acid (DPGA) against fibroblast growth factors receptor (FGFR). Epi also exhibited excellent inhibitory activity against the platelet-derived growth factor receptor (PDGFR), while DPGA effectively inhibited the vascular endothelial growth factor receptor. Additionally, the presence Epi in S. clavuligerus extract was validated through the HPLC technique. Thus, our findings highlight a superior inhibitory potential of Epi against FGFR and PDGFR RTKs than the FDA-approved drug.
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Affiliation(s)
- Ravi Saini
- Biomolecular Laboratory, School of Biochemical Engineering, Indian Institute of Technology (Banaras Hindu University), Varanasi, Uttar Pradesh, India
| | - Sonali Kumari
- Biomolecular Laboratory, School of Biochemical Engineering, Indian Institute of Technology (Banaras Hindu University), Varanasi, Uttar Pradesh, India
| | - Amit Singh
- Department of Pharmacology, Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India
| | - Abha Mishra
- Biomolecular Laboratory, School of Biochemical Engineering, Indian Institute of Technology (Banaras Hindu University), Varanasi, Uttar Pradesh, India
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4
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Xu Z, Mo Y, Li Z, Ban S, Song H. New small-molecule alcohol synthesis by breaking the space limitation of the "aromatic cage" in Pseudomonas sp. AK1 BBOX. Org Biomol Chem 2023; 21:6397-6404. [PMID: 37497645 DOI: 10.1039/d3ob00830d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/28/2023]
Abstract
Fe(II)/2OG-dependent oxygenase γ-butyrobetaine hydroxylase (BBOX) stereoselectively hydroxylates inactive C-H bonds and produces L-carnitine. It has potential applications in the biosynthesis of L-carnitine and the synthesis of other small molecule alcohols. In this paper, we systematically explore the substrate range of Pseudomonas sp. AK1 BBOX (psBBOX), with emphasis on the quaternary ammonium portion of γ-butyrobetaine (γ-BB). The space limitation of the "aromatic cage" in psBBOX in the hydroxylation of large quaternary ammonium analogues was studied, and the role of four aromatic amino acid residues in the substrate binding mode was analyzed. Consequently, the F188A mutant was developed with the ability to hydroxylate cyclic quaternary ammonium analogues and generate new alcohol compounds by breaking the limitation of the "aromatic cage".
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Affiliation(s)
- Zhiqin Xu
- School of Pharmacy, Shanxi Medical University, Taiyuan, Shanxi Province 030001, China.
| | - Yaling Mo
- School of Pharmacy, Shanxi Medical University, Taiyuan, Shanxi Province 030001, China.
| | - Zhengwen Li
- School of Pharmacy, Shanxi Medical University, Taiyuan, Shanxi Province 030001, China.
| | - Shurong Ban
- School of Pharmacy, Shanxi Medical University, Taiyuan, Shanxi Province 030001, China.
| | - Heng Song
- College of Chemistry & Molecular Science, Wuhan University, Wuhan, Hubei Province 430072, China.
- Wuhan University Shenzhen Research Institute, Shenzhen, Guangdong Province 518000, China
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5
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Kashif Khan R, Meanwell NA, Hager HH. Pseudoprolines as stereoelectronically tunable proline isosteres. Bioorg Med Chem Lett 2022; 75:128983. [PMID: 36096342 DOI: 10.1016/j.bmcl.2022.128983] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 08/29/2022] [Accepted: 09/05/2022] [Indexed: 11/18/2022]
Abstract
The cyclic structure of proline (Pro) confers unique conformational properties on this natural amino acid that influences polypeptide structure and function. Pseudoprolines are a family of Pro isosteres that incorporate a heteroatom, most prominently oxygen or sulfur but also silicon and selenium, to replace the Cβ or Cγ carbon atom of the pyrrolidine ring. These readily synthetically accessible structural motifs can facilitate facile molecular editing in a fashion that allows modulation of the amide bond topology of dipeptide elements and influence over ring pucker. While the properties of pseudoprolines have been exploited most prominently in the design of oligopeptide analogues, they have potential application in the design and optimization of small molecules. In this Digest, we summarize the physicochemical properties of pseudoprolines and illustrate their potential in drug discovery by surveying examples of applications in the design of bioactive molecules.
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Affiliation(s)
- R Kashif Khan
- Small Molecule Drug Discovery, Bristol Myers Squibb Research and Early Development, 100 Binney Street, Cambridge, MA 02142, USA.
| | - Nicholas A Meanwell
- Small Molecule Drug Discovery, Bristol Myers Squibb Research and Early Development, P.O. Box 4000, Princeton, NJ 08543-4000, USA.
| | - Harry H Hager
- Small Molecule Drug Discovery, Bristol Myers Squibb Research and Early Development, 200 Cambridgepark Drive, Cambridge, MA 02140, USA.
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6
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Fernandez‐Santamaria R, Bogas G, Montañez MI, Ariza A, Salas M, Cespedes JA, Labella M, Paris JL, Perez‐Sanchez N, Perez‐Inestrosa E, Vida Y, Fernandez TD, Mayorga C, Torres MJ. Synthetic antigenic determinants of clavulanic acid induce dendritic cell maturation and specific T cell proliferation in patients with immediate hypersensitivity reactions. Allergy 2022; 77:3070-3083. [PMID: 35611454 PMCID: PMC9796838 DOI: 10.1111/all.15383] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 04/19/2022] [Accepted: 05/04/2022] [Indexed: 01/28/2023]
Abstract
BACKGROUND Immediate drug hypersensitivity reactions (IDHRs) to clavulanic acid (CLV) have increased in the last decades due to a higher consumption alongside amoxicillin (AX). Due to its chemical instability, diagnostic procedures to evaluate IDHRs to CLV are difficult, and current in vitro assays do not have an optimal sensitivity. The inclusion of the specific metabolites after CLV degradation, which are efficiently recognised by the immune system, could help to improve sensitivity of in vitro tests. METHODS Recognition by dendritic cells (DCs) of CLV and the synthetic analogues of two of its hypothesised antigenic determinants (ADs) was evaluated by flow cytometry in 27 allergic patients (AP) and healthy controls (HC). Their ability to trigger the proliferation of T cells was also analysed by flow cytometry. RESULTS The inclusion of synthetic analogues of CLV ADs, significantly increased the expression of maturation markers on DCs from AP compared to HC. A different recognition pattern could be observed with each AD, and, therefore, the inclusion of both ADs achieves an improved sensitivity. The addition of synthetic ADs analogues increased the proliferative response of CD4+ Th2 compared to the addition of native CLV. The combination of results from both ADs increased the sensitivity of proliferative assays from 19% to 65% with a specificity higher than 90%. CONCLUSIONS Synthetic ADs from CLV are efficiently recognised by DCs with ability to activate CD4+ Th2 cells from AP. The combination of analogues from both ADs, significantly increased the sensitivity of DC maturation and T-cell proliferation compared to native CLV.
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Affiliation(s)
- Ruben Fernandez‐Santamaria
- Allergy Research Group, Instituto de Investigación Biomédica de Málaga‐IBIMA‐ARADyALMálagaSpain,Departmento de Medicina, Universidad de Málaga‐UMAMálagaSpain
| | - Gador Bogas
- Allergy Research Group, Instituto de Investigación Biomédica de Málaga‐IBIMA‐ARADyALMálagaSpain,Allergy Unit, Hospital Regional Universitario de Málaga‐HRUMMálagaSpain
| | - Maria Isabel Montañez
- Allergy Research Group, Instituto de Investigación Biomédica de Málaga‐IBIMA‐ARADyALMálagaSpain,Departamento de Química Orgánica, Universidad de Málaga‐UMAMálagaSpain,Nanostructures for Diagnosing and Treatment of Allergic Diseases Laboratory, Centro Andaluz de Nanomedicina y Biotecnología‐BIONANDMálagaSpain
| | - Adriana Ariza
- Allergy Research Group, Instituto de Investigación Biomédica de Málaga‐IBIMA‐ARADyALMálagaSpain
| | - Maria Salas
- Allergy Research Group, Instituto de Investigación Biomédica de Málaga‐IBIMA‐ARADyALMálagaSpain,Allergy Unit, Hospital Regional Universitario de Málaga‐HRUMMálagaSpain
| | - Jose Antonio Cespedes
- Allergy Research Group, Instituto de Investigación Biomédica de Málaga‐IBIMA‐ARADyALMálagaSpain,Departmento de Medicina, Universidad de Málaga‐UMAMálagaSpain
| | - Marina Labella
- Allergy Research Group, Instituto de Investigación Biomédica de Málaga‐IBIMA‐ARADyALMálagaSpain,Allergy Unit, Hospital Regional Universitario de Málaga‐HRUMMálagaSpain
| | - Juan Luis Paris
- Allergy Research Group, Instituto de Investigación Biomédica de Málaga‐IBIMA‐ARADyALMálagaSpain,Nanostructures for Diagnosing and Treatment of Allergic Diseases Laboratory, Centro Andaluz de Nanomedicina y Biotecnología‐BIONANDMálagaSpain
| | - Natalia Perez‐Sanchez
- Allergy Research Group, Instituto de Investigación Biomédica de Málaga‐IBIMA‐ARADyALMálagaSpain,Allergy Unit, Hospital Regional Universitario de Málaga‐HRUMMálagaSpain
| | - Ezequiel Perez‐Inestrosa
- Departamento de Química Orgánica, Universidad de Málaga‐UMAMálagaSpain,Nanostructures for Diagnosing and Treatment of Allergic Diseases Laboratory, Centro Andaluz de Nanomedicina y Biotecnología‐BIONANDMálagaSpain
| | - Yolanda Vida
- Departamento de Química Orgánica, Universidad de Málaga‐UMAMálagaSpain,Nanostructures for Diagnosing and Treatment of Allergic Diseases Laboratory, Centro Andaluz de Nanomedicina y Biotecnología‐BIONANDMálagaSpain
| | - Tahia D. Fernandez
- Allergy Research Group, Instituto de Investigación Biomédica de Málaga‐IBIMA‐ARADyALMálagaSpain,Departamento de Biología Celular, Genética y Fisiología, Universidad de Málaga‐UMAMálagaSpain
| | - Cristobalina Mayorga
- Allergy Research Group, Instituto de Investigación Biomédica de Málaga‐IBIMA‐ARADyALMálagaSpain,Allergy Unit, Hospital Regional Universitario de Málaga‐HRUMMálagaSpain,Nanostructures for Diagnosing and Treatment of Allergic Diseases Laboratory, Centro Andaluz de Nanomedicina y Biotecnología‐BIONANDMálagaSpain
| | - Maria Jose Torres
- Allergy Research Group, Instituto de Investigación Biomédica de Málaga‐IBIMA‐ARADyALMálagaSpain,Departmento de Medicina, Universidad de Málaga‐UMAMálagaSpain,Allergy Unit, Hospital Regional Universitario de Málaga‐HRUMMálagaSpain,Nanostructures for Diagnosing and Treatment of Allergic Diseases Laboratory, Centro Andaluz de Nanomedicina y Biotecnología‐BIONANDMálagaSpain
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7
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Panth N, Wenger ES, Krebs C, Bollinger JM, Grossman RB. Synthesis of 6,6- and 7,7-difluoro-1-acetamidopyrrolizidines and their oxidation catalyzed by the nonheme Fe oxygenase LolO. Chembiochem 2022; 23:e202200081. [PMID: 35482316 DOI: 10.1002/cbic.202200081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2022] [Revised: 03/26/2022] [Indexed: 11/11/2022]
Abstract
LolO, a 2-oxoglutarate-dependent nonheme Fe oxygenase, catalyzes both the hydroxylation and cycloetherification of 1- exo -acetamidopyrrolizidine (AcAP), a pathway intermediate in the biosynthesis of the loline alkaloids. We have prepared fluorinated AcAP analogs to aid in continued mechanistic investigation of the unusual LolO-catalyzed cycloetherification step. LolO was able to first hydroxylate and then cycloetherify 6,6-difluoro-AcAP (prepared from N , O -protected 4-oxoproline), forming a difluorinated analog of N -acetylnorloline (NANL) and providing evidence for a cycloetherification mechanism involving a C(7) radical as opposed to a C(7) carbocation. By contrast, LolO was able to hydroxylate 7,7-difluoro-AcAP (prepared from 3-oxoproline) but failed to cycloetherify it, forming (1 R , 2 R , 8 S )-7,7-difluoro-2-hydroxy-AcAP as the sole product. Because it completely blocks the cycloetherification step, 7,7-difluoro-AcAP has the potential to become an important tool for accumulating and characterizing the LolO intermediate responsible for catalyzing cycloetherification of 2-hydroxy-AcAP.
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Affiliation(s)
- Nabin Panth
- University of Kentucky, Chemistry, UNITED STATES
| | | | - Carsten Krebs
- The Pennsylvania State University, Chemistry; Biochemistry and Molecular Biology, UNITED STATES
| | - J Martin Bollinger
- The Pennsylvania State University, Chemistry; Biochemistry and Molecular Biology, UNITED STATES
| | - Robert B Grossman
- University of Kentucky, Chemistry, Chemistry-Physics Building, 40506-0055, Lexington, UNITED STATES
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8
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Abstract
The Streptomyces clavuligerus genome consists in a linear chromosome of about 6.7 Mb and four plasmids (pSCL1 to pSCL4), the latter one of 1.8 Mb. Deletion of pSCL4, results in viable mutants with high instability in the chromosome arms, which may lead to chromosome circularisation. Transcriptomic and proteomic studies comparing different mutants with the wild-type strain improved our knowledge on the biosynthesis and regulation of clavulanic acid, cephamycin C and holomycin. Additional knowledge has been obtained on the SARP-type CcaR activator and the network of connections with other regulators (Brp, AreB, AdpA, BldG, RelA) controlling ccaR expression. The transcriptional pattern of the cephamycin and clavulanic acid clusters is supported by the binding of CcaR to different promoters and confirmed that ClaR is a CcaR-dependent activator that controls the late steps of clavulanic biosynthesis. Metabolomic studies allowed the detection of new metabolites produced by S. clavuligerus such as naringenin, desferroxamines, several N-acyl tunicamycins, the terpenes carveol and cuminyl alcohol or bafilomycin J. Heterologous expression of S. clavuligerus terpene synthases resulted in the formation of no less than 15 different terpenes, although none of them was detected in S. clavuligerus culture broth. In summary, application of the Omic tools results in a better understanding of the molecular biology of S. clavuligerus, that allows the use of this strain as an industrial actinobacterial platform and helps to improve CA production.
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Affiliation(s)
- Paloma Liras
- Microbiology Section. Department of Molecular Biology University of León, León 24071. Spain
| | - Juan F Martín
- Microbiology Section. Department of Molecular Biology University of León, León 24071. Spain
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9
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Wang X, Hu C, Qin C, Dong Y, Ying G, Xiu Z, Su Z. Simultaneous solid-liquid separation and primary purification of clavulanic acid from fermentation broth of Streptomyces clavuligerus using salting-out extraction system. Eng Life Sci 2021; 21:643-652. [PMID: 34690635 PMCID: PMC8518655 DOI: 10.1002/elsc.202000091] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Revised: 07/14/2021] [Accepted: 07/22/2021] [Indexed: 11/10/2022] Open
Abstract
Clavulanic acid (CA) is usually used together with other β-lactam antibiotics as combination drugs to inhibit bacterial β-lactamases, which is mainly produced from the fermentation of microorganism such as Streptomyces clavuligerus. Recently, it is still a challenge for downstream processing of low concentration and unstable CA from fermentation broth with high solid content, high viscosity, and small cell size. In this study, an integrated process was developed for simultaneous solid-liquid separation and primary purification of CA from real fermentation broth of S. clavuligerus using salting-out extraction system (SOES). First, different SOESs were investigated, and a suitable SOES composed of ethanol/phosphate was chosen and further optimized using the pretreated fermentation broth. Then, the optimal system composed of 20% ethanol/15% K2HPO4 and 10% KH2PO4 w/w was used to direct separation of CA from untreated fermentation broth. The result showed that the partition coefficient (K) and recovery yield (Y) of CA from untreated fermentation broth were 29.13 and 96.8%, respectively. Simultaneously, the removal rates of the cells and proteins were 99.8% and 63.3%, respectively. Compared with the traditional method of membrane filtration or liquid-liquid extraction system, this developed SOES showed the advantages of simple operation, shorter operation time, lower process cost and higher recovery yield of CA. These results demonstrated that the developed SOES could be used as an attractive alternative for the downstream processing of CA from real fermentation broth.
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Affiliation(s)
- Xu‐Dong Wang
- School of BioengineeringDalian University of TechnologyDalianP. R. China
- College of Pharmaceutical ScienceZhejiang University of TechnologyHangzhouP. R. China
| | - Chun‐Yan Hu
- School of BioengineeringDalian University of TechnologyDalianP. R. China
| | - Chao Qin
- School of BioengineeringDalian University of TechnologyDalianP. R. China
| | - Yue‐Sheng Dong
- School of BioengineeringDalian University of TechnologyDalianP. R. China
| | - Guo‐Qing Ying
- College of Pharmaceutical ScienceZhejiang University of TechnologyHangzhouP. R. China
| | - Zhi‐Long Xiu
- School of BioengineeringDalian University of TechnologyDalianP. R. China
| | - Zhi‐Guo Su
- State Key Laboratory of Biochemical EngineeringInstitute of Process EngineeringChinese Academy of SciencesBeijingP. R. China
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10
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Martín-Serrano Á, Gonzalez-Morena JM, Barbero N, Ariza A, Sánchez Gómez FJ, Pérez-Inestrosa E, Pérez-Sala D, Torres MJ, Montañez MI. Biotin-Labelled Clavulanic Acid to Identify Proteins Target for Haptenation in Serum: Implications in Allergy Studies. Front Pharmacol 2021; 11:594755. [PMID: 33442385 PMCID: PMC7797785 DOI: 10.3389/fphar.2020.594755] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Accepted: 10/06/2020] [Indexed: 12/19/2022] Open
Abstract
Clavulanic acid (CLV) and amoxicillin, frequently administered in combination, can be independently involved in allergic reactions. Protein haptenation with β-lactams is considered necessary to activate the immune system. The aim of this study was to assess the suitability of biotinylated analogues of CLV as probes to study protein haptenation by this β-lactam. Two synthetic approaches afforded the labeling of CLV through esterification of its carboxylic group with a biotin moiety, via either direct binding (CLV-B) or tetraethylenglycol linker (CLV-TEG-B). The second analogue offered advantages as solubility in aqueous solution and potential lower steric hindrance for both intended interactions, with the protein and with avidin. NMR reactivity studies showed that both CLV and CLV-TEG-B reacts through β-lactam ring opening by aliphatic amino nitrogen, however with different stability of resulting conjugates. Unlike CLV conjugates, that promoted the decomposition of clavulanate fragment, the conjugates obtained with the CLV-TEG-B remained linked, as a whole structure including biotin, to nucleophile and showed a better stability. This was a desired key feature to allow CLV-TEG-B conjugated protein detection at great sensitivity. We have used biotin detection and mass spectrometry (MS) to detect the haptenation of human serum albumin (HSA) and human serum proteins. MS of conjugates showed that HSA could be modified by CLV-TEG-B. Remarkably, HSA preincubation with CLV excess only reduced moderately the incorporation of CLV-TEG-B, which could be attributed to different protein interferences. The CLV-TEG-B fragment with opened β-lactam was detected bound to the 404-430HSA peptide of the treated protein. Incubation of human serum with CLV-TEG-B resulted in the haptenation of several proteins that were identified by 2D-electrophoresis and peptide mass fingerprinting as HSA, haptoglobin, and heavy and light chains of immunoglobulins. Taken together, our results show that tagged-CLV keeps some of the CLV features. Moreover, although we observe a different behavior in the conjugate stability and in the site of protein modification, the similar reactivity indicates that it could constitute a valuable tool to identify protein targets for haptenation by CLV with high sensitivity to get insights into the activation of the immune system by CLV and mechanisms involved in β-lactams allergy.
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Affiliation(s)
- Ángela Martín-Serrano
- Allergy Research Group, Instituto de Investigación Biomédica de Málaga-IBIMA, Málaga, Spain.,Centro Andaluz de Nanomedicina y Biotecnología-BIONAND, Málaga, Spain
| | - Juan M Gonzalez-Morena
- Department of Structural and Chemical Biology, Centro de Investigaciones Biológicas Margarita Salas (CSIC), Madrid, Spain
| | - Nekane Barbero
- Centro Andaluz de Nanomedicina y Biotecnología-BIONAND, Málaga, Spain.,Department Química Orgánica, Universidad de Málaga-IBIMA, Málaga, Spain
| | - Adriana Ariza
- Allergy Research Group, Instituto de Investigación Biomédica de Málaga-IBIMA, Málaga, Spain
| | - Francisco J Sánchez Gómez
- Department of Structural and Chemical Biology, Centro de Investigaciones Biológicas Margarita Salas (CSIC), Madrid, Spain
| | - Ezequiel Pérez-Inestrosa
- Centro Andaluz de Nanomedicina y Biotecnología-BIONAND, Málaga, Spain.,Department Química Orgánica, Universidad de Málaga-IBIMA, Málaga, Spain
| | - Dolores Pérez-Sala
- Department of Structural and Chemical Biology, Centro de Investigaciones Biológicas Margarita Salas (CSIC), Madrid, Spain
| | - Maria J Torres
- Allergy Research Group, Instituto de Investigación Biomédica de Málaga-IBIMA, Málaga, Spain.,Centro Andaluz de Nanomedicina y Biotecnología-BIONAND, Málaga, Spain.,Allergy Unit, Hospital Regional Universitario de Málaga, Málaga, Spain.,Department of Medicina, Universidad de Málaga, Málaga, Spain
| | - María I Montañez
- Allergy Research Group, Instituto de Investigación Biomédica de Málaga-IBIMA, Málaga, Spain.,Centro Andaluz de Nanomedicina y Biotecnología-BIONAND, Málaga, Spain
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11
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Pan J, Wenger ES, Matthews ML, Pollock CJ, Bhardwaj M, Kim AJ, Allen BD, Grossman RB, Krebs C, Bollinger JM. Evidence for Modulation of Oxygen Rebound Rate in Control of Outcome by Iron(II)- and 2-Oxoglutarate-Dependent Oxygenases. J Am Chem Soc 2019; 141:15153-15165. [PMID: 31475820 DOI: 10.1021/jacs.9b06689] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Iron(II)- and 2-oxoglutarate-dependent (Fe/2OG) oxygenases generate iron(IV)-oxo (ferryl) intermediates that can abstract hydrogen from aliphatic carbons (R-H). Hydroxylation proceeds by coupling of the resultant substrate radical (R•) and oxygen of the Fe(III)-OH complex ("oxygen rebound"). Nonhydroxylation outcomes result from different fates of the Fe(III)-OH/R• state; for example, halogenation results from R• coupling to a halogen ligand cis to the hydroxide. We previously suggested that halogenases control substrate-cofactor disposition to disfavor oxygen rebound and permit halogen coupling to prevail. Here, we explored the general implication that, when a ferryl intermediate can ambiguously target two substrate carbons for different outcomes, rebound to the site capable of the alternative outcome should be slower than to the adjacent, solely hydroxylated site. We evaluated this prediction for (i) the halogenase SyrB2, which exclusively hydroxylates C5 of norvaline appended to its carrier protein but can either chlorinate or hydroxylate C4 and (ii) two bifunctional enzymes that normally hydroxylate one carbon before coupling that oxygen to a second carbon (producing an oxacycle) but can, upon encountering deuterium at the first site, hydroxylate the second site instead. In all three cases, substrate hydroxylation incorporates a greater fraction of solvent-derived oxygen at the site that can also undergo the alternative outcome than at the other site, most likely reflecting an increased exchange of the initially O2-derived oxygen ligand in the longer-lived Fe(III)-OH/R• states. Suppression of rebound may thus be generally important for nonhydroxylation outcomes by these enzymes.
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Affiliation(s)
| | | | | | | | - Minakshi Bhardwaj
- Department of Chemistry , University of Kentucky , Lexington , Kentucky 40546-0312 , United States
| | | | | | - Robert B Grossman
- Department of Chemistry , University of Kentucky , Lexington , Kentucky 40546-0312 , United States
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12
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Barbero N, Fernández‐Santamaría R, Mayorga C, Martin‐Serrano Á, Salas M, Bogas G, Nájera F, Pérez‐Sala D, Pérez‐Inestrosa E, Fernandez TD, Montañez MI, Torres MJ. Identification of an antigenic determinant of clavulanic acid responsible for IgE-mediated reactions. Allergy 2019; 74:1490-1501. [PMID: 30829415 DOI: 10.1111/all.13761] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Revised: 01/23/2019] [Accepted: 02/18/2019] [Indexed: 12/25/2022]
Abstract
BACKGROUND Selective reactions to clavulanic acid (CLV) account for around 30% of immediate reactions after administration of amoxicillin-CLV. Currently, no immunoassay is available for detecting specific IgE to CLV, and its specific recognition in patients with immediate reactions has only been demonstrated by basophil activation testing, however with suboptimal sensitivity. The lack of knowledge regarding the structure of the drug that remains bound to proteins (antigenic determinant) is hampering the development of in vitro diagnostics. We aimed to identify the antigenic determinants of CLV as well as to evaluate their specific IgE recognition and potential role for diagnosis. METHODS Based on complex CLV degradation mechanisms, we hypothesized the formation of two antigenic determinants for CLV, AD-I (N-protein, 3-oxopropanamide) and AD-II (N-protein, 3-aminopropanamide), and designed different synthetic analogs to each one. IgE recognition of these structures was evaluated in basophils from patients with selective reactions to CLV and tolerant subjects. In parallel, the CLV fragments bound to proteins were identified by proteomic approaches. RESULTS Two synthetic analogs of AD-I were found to activate basophils from allergic patients. This determinant was also detected bound to lysines 195 and 475 of CLV-treated human serum albumin. One of these analogs was able to activate basophils in 59% of patients whereas CLV only in 41%. Combining both results led to an increase in basophil activation in 69% of patients, and only in 12% of controls. CONCLUSION We have identified AD-I as one CLV antigenic determinant, which is the drug fragment that remains protein-bound.
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Affiliation(s)
- Nekane Barbero
- Andalusian Center for Nanomedicine and Biotechnology – BIONANDMálaga Spain
- Department of Organic Chemistry IBIMAUniversity of Málaga Málaga Spain
| | | | - Cristobalina Mayorga
- Andalusian Center for Nanomedicine and Biotechnology – BIONANDMálaga Spain
- Allergy Research GroupInstituto de Investigacion Biomédica de Malaga‐IBIMA Málaga Spain
- Allergy UnitHospital Regional Universitario de Malaga Málaga Spain
| | - Ángela Martin‐Serrano
- Andalusian Center for Nanomedicine and Biotechnology – BIONANDMálaga Spain
- Allergy Research GroupInstituto de Investigacion Biomédica de Malaga‐IBIMA Málaga Spain
| | - María Salas
- Allergy Research GroupInstituto de Investigacion Biomédica de Malaga‐IBIMA Málaga Spain
- Allergy UnitHospital Regional Universitario de Malaga Málaga Spain
| | - Gador Bogas
- Allergy Research GroupInstituto de Investigacion Biomédica de Malaga‐IBIMA Málaga Spain
- Allergy UnitHospital Regional Universitario de Malaga Málaga Spain
| | - Francisco Nájera
- Andalusian Center for Nanomedicine and Biotechnology – BIONANDMálaga Spain
- Department of Organic Chemistry IBIMAUniversity of Málaga Málaga Spain
| | | | - Ezequiel Pérez‐Inestrosa
- Andalusian Center for Nanomedicine and Biotechnology – BIONANDMálaga Spain
- Department of Organic Chemistry IBIMAUniversity of Málaga Málaga Spain
| | - Tahia D. Fernandez
- Allergy Research GroupInstituto de Investigacion Biomédica de Malaga‐IBIMA Málaga Spain
| | - María I. Montañez
- Andalusian Center for Nanomedicine and Biotechnology – BIONANDMálaga Spain
- Allergy Research GroupInstituto de Investigacion Biomédica de Malaga‐IBIMA Málaga Spain
| | - María J. Torres
- Andalusian Center for Nanomedicine and Biotechnology – BIONANDMálaga Spain
- Allergy Research GroupInstituto de Investigacion Biomédica de Malaga‐IBIMA Málaga Spain
- Allergy UnitHospital Regional Universitario de Malaga Málaga Spain
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13
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Martínez-Burgo Y, Santos-Aberturas J, Rodríguez-García A, Barreales EG, Tormo JR, Truman AW, Reyes F, Aparicio JF, Liras P. Activation of Secondary Metabolite Gene Clusters in Streptomyces clavuligerus by the PimM Regulator of Streptomyces natalensis. Front Microbiol 2019; 10:580. [PMID: 30984130 PMCID: PMC6448028 DOI: 10.3389/fmicb.2019.00580] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Accepted: 03/06/2019] [Indexed: 11/13/2022] Open
Abstract
Expression of non-native transcriptional activators may be a powerful general method to activate secondary metabolites biosynthetic pathways. PAS-LuxR regulators, whose archetype is PimM, activate the biosynthesis of polyene macrolide antifungals and other antibiotics, and have been shown to be functionally preserved across multiple Streptomyces strains. In this work we show that constitutive expression of pimM in Streptomyces clavuligerus ATCC 27064 significantly affected its transcriptome and modifies secondary metabolism. Almost all genes in three secondary metabolite clusters were overexpressed, including the clusters responsible for the biosynthesis of the clinically important clavulanic acid and cephamycin C. In comparison to a control strain, this resulted in 10- and 7-fold higher production levels of these metabolites, respectively. Metabolomic and bioactivity studies of S. clavuligerus::pimM also revealed deep metabolic changes. Antifungal activity absent in the control strain was detected in S. clavuligerus::pimM, and determined to be the result of a fivefold increase in the production of the tunicamycin complex.
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Affiliation(s)
| | | | - Antonio Rodríguez-García
- Microbiology Section, Department of Molecular Biology, University of León, León, Spain.,Institute of Biotechnology of León, INBIOTEC, León, Spain
| | - Eva G Barreales
- Microbiology Section, Department of Molecular Biology, University of León, León, Spain
| | - José Rubén Tormo
- Centre of Excellence for Research into Innovative Medicine, Health Sciences Technology, MEDINA, Granada, Spain
| | - Andrew W Truman
- Department of Molecular Microbiology, John Innes Centre, Norwich, United Kingdom
| | - Fernando Reyes
- Centre of Excellence for Research into Innovative Medicine, Health Sciences Technology, MEDINA, Granada, Spain
| | - Jesús F Aparicio
- Microbiology Section, Department of Molecular Biology, University of León, León, Spain
| | - Paloma Liras
- Microbiology Section, Department of Molecular Biology, University of León, León, Spain
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14
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Fu J, Qin R, Zong G, Liu C, Kang N, Zhong C, Cao G. The CagRS Two-Component System Regulates Clavulanic Acid Metabolism via Multiple Pathways in Streptomyces clavuligerus F613-1. Front Microbiol 2019; 10:244. [PMID: 30837970 PMCID: PMC6382702 DOI: 10.3389/fmicb.2019.00244] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2018] [Accepted: 01/29/2019] [Indexed: 11/21/2022] Open
Abstract
Streptomyces clavuligerus F613-1 produces a clinically important β-lactamase inhibitor, clavulanic acid (CA). Although the biosynthesis pathway of CA has essentially been elucidated, the global regulatory mechanisms of CA biosynthesis remain unclear. The paired genes cagS and cagR, which are annotated, respectively, as orf22 and orf23 in S. clavuligerus ATCC 27064, encode a bacterial two-component regulatory system (TCS) and were found next to the CA biosynthetic gene cluster of S. clavuligerus F613-1. To further elucidate the regulatory mechanism of CA biosynthesis, the CagRS TCS was deleted from S. clavuligerus F613-1. Deletion of cagRS resulted in decreased production of CA, but the strain phenotype was not otherwise affected. Both transcriptome and ChIP-seq data revealed that, in addition to CA biosynthesis, the CagRS TCS mainly regulates genes involved in primary metabolism, such as glyceraldehyde 3-phosphate (G3P) metabolism and arginine biosynthesis. Notably, both G3P and arginine are precursors of CA. Electrophoretic mobility shift assays demonstrated that the response regulator CagR could bind to the intergenic regions of argG, argC, oat1, oat2, ceaS1, and claR in vitro, suggesting that CagR can directly regulate genes involved in arginine and CA biosynthesis. This study indicated that CagRS is a pleiotropic regulator that can directly affect the biosynthesis of CA and indirectly affect CA production by regulating the metabolism of arginine and G3P. Our findings provide new insights into the regulation of CA biosynthetic pathways and provide an innovative approach for future metabolic engineering efforts for CA production in S. clavuligerus.
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Affiliation(s)
- Jiafang Fu
- Shandong Medicinal Biotechnology Center, Shandong Academy of Medical Sciences, Jinan, China
| | - Ronghuo Qin
- Shandong Medicinal Biotechnology Center, Shandong Academy of Medical Sciences, Jinan, China
| | - Gongli Zong
- Shandong Medicinal Biotechnology Center, Shandong Academy of Medical Sciences, Jinan, China
| | - Cheng Liu
- School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan, China
| | - Ni Kang
- Shandong Medicinal Biotechnology Center, Shandong Academy of Medical Sciences, Jinan, China
| | - Chuanqing Zhong
- School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan, China
| | - Guangxiang Cao
- Shandong Medicinal Biotechnology Center, Shandong Academy of Medical Sciences, Jinan, China
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15
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Rodrigues KCS, Costa CLL, Badino AC, Pedrolli DB, Pereira JFB, Cerri MO. Application of Acid and Cold Stresses to Enhance the Production of Clavulanic Acid by Streptomyces clavuligerus. Appl Biochem Biotechnol 2019; 188:706-719. [PMID: 30680701 DOI: 10.1007/s12010-019-02953-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Accepted: 01/11/2019] [Indexed: 11/26/2022]
Abstract
Clavulanic acid (CA) is frequently prescribed for treatment of bacterial infections. Despite the large number of studies concerning CA production, there is still a need to search for more effective and productive processes because it is mainly produced by biochemical route and is chemically unstable. This paper evaluates the influence of acid and cold stresses on CA production by Streptomyces clavuligerus in bench scale stirred tank bioreactor. Four batch cultures were conducted at constant pH (6.8 or 6.3) and temperature (30, 25, or 20 °C) and five batch cultures were performed with application of acid stress (pH reduction from 6.8 to 6.3), cold stress (reduction from 30 to 20 °C), or both. The highest maximum CA concentration (684.4 mg L-1) was obtained in the culture conducted at constant temperature of 20 °C. However, the culture under acid stress, in which the pH was reduced from 6.8 to 6.3 at a rate of 0.1 pH unit every 6 h, provided the most promising result, exhibiting a global yield coefficient of CA relative to cell formation (YCA/X) of 851.1 mgCA gX-1. High YCA/X values indicate that a small number of cells are able to produce a large amount of antibiotic with formation of smaller amounts of side byproducts. This could be especially attractive for decreasing the complexity and cost of the downstream processing, enhancing CA production.
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Affiliation(s)
- K C S Rodrigues
- Graduate Program of Chemical Engineering, Federal University of São Carlos, C.P. 676, São Carlos, SP, CEP 13565-905, Brazil
| | - C L L Costa
- Graduate Program of Chemical Engineering, Federal University of São Carlos, C.P. 676, São Carlos, SP, CEP 13565-905, Brazil
| | - A C Badino
- Graduate Program of Chemical Engineering, Federal University of São Carlos, C.P. 676, São Carlos, SP, CEP 13565-905, Brazil
| | - D B Pedrolli
- Department of Bioprocesses and Biotechnology, School of Pharmaceutical Sciences, São Paulo State University - UNESP, Araraquara, SP, CEP 14801-902, Brazil
| | - J F B Pereira
- Department of Bioprocesses and Biotechnology, School of Pharmaceutical Sciences, São Paulo State University - UNESP, Araraquara, SP, CEP 14801-902, Brazil
| | - M O Cerri
- Department of Bioprocesses and Biotechnology, School of Pharmaceutical Sciences, São Paulo State University - UNESP, Araraquara, SP, CEP 14801-902, Brazil.
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16
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Walport LJ, Schofield CJ. Adventures in Defining Roles of Oxygenases in the Regulation of Protein Biosynthesis. CHEM REC 2018; 18:1760-1781. [PMID: 30151867 DOI: 10.1002/tcr.201800056] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Accepted: 07/17/2018] [Indexed: 12/19/2022]
Abstract
The 2-oxoglutarate (2OG) dependent oxygenases were first identified as having roles in the post-translational modification of procollagen in animals. Subsequently in plants and microbes, they were shown to have roles in the biosynthesis of many secondary metabolites, including signalling molecules and the penicillin/cephalosporin antibiotics. Crystallographic studies of microbial 2OG oxygenases and related enzymes, coupled to DNA sequence analyses, led to the prediction that 2OG oxygenases are widely distributed in aerobic biology. This personal account begins with examples of the roles of 2OG oxygenases in antibiotic biosynthesis, and then describes efforts to assign functions to other predicted 2OG oxygenases. In humans, 2OG oxygenases have been found to have roles in small molecule metabolism, as well as in the epigenetic regulation of protein and nucleic acid biosynthesis and function. The roles and functions of human 2OG oxygenases are compared, focussing on discussion of their substrate and product selectivities. The account aims to emphasize how scoping the substrate selectivity of, sometimes promiscuous, enzymes can provide insights into their functions and so enable therapeutic work.
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Affiliation(s)
- Louise J Walport
- Department of Chemistry, University of Oxford Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, UK
| | - Christopher J Schofield
- Department of Chemistry, University of Oxford Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, UK
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17
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Meng S, Tang GL, Pan HX. Enzymatic Formation of Oxygen-Containing Heterocycles in Natural Product Biosynthesis. Chembiochem 2018; 19:2002-2022. [PMID: 30039582 DOI: 10.1002/cbic.201800225] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2018] [Indexed: 01/12/2023]
Abstract
Oxygen-containing heterocycles are widely encountered in natural products that display diverse pharmacological properties and have potential benefits to human health. The formation of O-heterocycles catalyzed by different types of enzymes in the biosynthesis of natural products not only contributes to the structural diversity of these compounds, but also enriches our understanding of nature's ability to construct complex molecules. This minireview focuses on the various modes of enzymatic O-heterocyclization identified in natural product biosynthesis and summarizes the possible mechanisms involved in ring closure.
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Affiliation(s)
- Song Meng
- State Key Laboratory of Bio-organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of the Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
| | - Gong-Li Tang
- State Key Laboratory of Bio-organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of the Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
| | - Hai-Xue Pan
- State Key Laboratory of Bio-organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of the Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
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18
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Rabe P, Kamps JJAG, Schofield CJ, Lohans CT. Roles of 2-oxoglutarate oxygenases and isopenicillin N synthase in β-lactam biosynthesis. Nat Prod Rep 2018; 35:735-756. [PMID: 29808887 PMCID: PMC6097109 DOI: 10.1039/c8np00002f] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Indexed: 01/01/2023]
Abstract
Covering: up to 2017 2-Oxoglutarate (2OG) dependent oxygenases and the homologous oxidase isopenicillin N synthase (IPNS) play crucial roles in the biosynthesis of β-lactam ring containing natural products. IPNS catalyses formation of the bicyclic penicillin nucleus from a tripeptide. 2OG oxygenases catalyse reactions that diversify the chemistry of β-lactams formed by both IPNS and non-oxidative enzymes. Reactions catalysed by the 2OG oxygenases of β-lactam biosynthesis not only involve their typical hydroxylation reactions, but also desaturation, epimerisation, rearrangement, and ring-forming reactions. Some of the enzymes involved in β-lactam biosynthesis exhibit remarkable substrate and product selectivities. We review the roles of 2OG oxygenases and IPNS in β-lactam biosynthesis, highlighting opportunities for application of knowledge of their roles, structures, and mechanisms.
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Affiliation(s)
- Patrick Rabe
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK.
| | - Jos J A G Kamps
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK.
| | - Christopher J Schofield
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK.
| | - Christopher T Lohans
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK.
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19
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Gao SS, Naowarojna N, Cheng R, Liu X, Liu P. Recent examples of α-ketoglutarate-dependent mononuclear non-haem iron enzymes in natural product biosyntheses. Nat Prod Rep 2018; 35:792-837. [PMID: 29932179 PMCID: PMC6093783 DOI: 10.1039/c7np00067g] [Citation(s) in RCA: 104] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Covering: up to 2018 α-Ketoglutarate (αKG, also known as 2-oxoglutarate)-dependent mononuclear non-haem iron (αKG-NHFe) enzymes catalyze a wide range of biochemical reactions, including hydroxylation, ring fragmentation, C-C bond cleavage, epimerization, desaturation, endoperoxidation and heterocycle formation. These enzymes utilize iron(ii) as the metallo-cofactor and αKG as the co-substrate. Herein, we summarize several novel αKG-NHFe enzymes involved in natural product biosyntheses discovered in recent years, including halogenation reactions, amino acid modifications and tailoring reactions in the biosynthesis of terpenes, lipids, fatty acids and phosphonates. We also conducted a survey of the currently available structures of αKG-NHFe enzymes, in which αKG binds to the metallo-centre bidentately through either a proximal- or distal-type binding mode. Future structure-function and structure-reactivity relationship investigations will provide crucial information regarding how activities in this large class of enzymes have been fine-tuned in nature.
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Affiliation(s)
- Shu-Shan Gao
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | | | - Ronghai Cheng
- Department of Chemistry, Boston University, Boston, MA 02215, USA.
| | - Xueting Liu
- Department of Chemistry, Boston University, Boston, MA 02215, USA. and State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China.
| | - Pinghua Liu
- Department of Chemistry, Boston University, Boston, MA 02215, USA.
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20
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Viana Marques DDA, Machado SEF, Ebinuma VCS, Duarte CDAL, Converti A, Porto ALF. Production of β-Lactamase Inhibitors by Streptomyces Species. Antibiotics (Basel) 2018; 7:E61. [PMID: 30018235 PMCID: PMC6163296 DOI: 10.3390/antibiotics7030061] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Revised: 07/07/2018] [Accepted: 07/12/2018] [Indexed: 12/11/2022] Open
Abstract
β-Lactamase inhibitors have emerged as an effective alternative to reduce the effects of resistance against β-lactam antibiotics. The Streptomyces genus is known for being an exceptional natural source of antimicrobials and β-lactamase inhibitors such as clavulanic acid, which is largely applied in clinical practice. To protect against the increasing prevalence of multidrug-resistant bacterial strains, new antibiotics and β-lactamase inhibitors need to be discovered and developed. This review will cover an update about the main β-lactamase inhibitors producers belonging to the Streptomyces genus; advanced methods, such as genetic and metabolic engineering, to enhance inhibitor production compared with wild-type strains; and fermentation and purification processes. Moreover, clinical practice and commercial issues are discussed. The commitment of companies and governments to develop innovative strategies and methods to improve the access to new, efficient, and potentially cost-effective microbial products to combat the antimicrobial resistance is also highlighted.
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Affiliation(s)
- Daniela de Araújo Viana Marques
- Campus Serra Talhada, University of Pernambuco, Avenida Custódio Conrado, 600, AABB, Serra Talhada, Pernambuco 56912-550, Brazil.
| | - Suellen Emilliany Feitosa Machado
- Department of Antibiotics, Federal University of Pernambuco, Avenida da Engenharia, 2° andar, Cidade Universitária, Recife, Pernambuco 50740-600, Brazil.
| | - Valéria Carvalho Santos Ebinuma
- Department of Bioprocesses and Biotechnology, School of Pharmaceutical Sciences, São Paulo State University (UNESP), Rodovia Araraquara-Jaú/Km 01, Araraquara 14800-903, Brazil.
| | | | - Attilio Converti
- Department of Civil, Chemical and Environmental Engineering, Chemical Pole, University of Genoa, Via Opera Pia 15, 16145 Genoa, Italy.
| | - Ana Lúcia Figueiredo Porto
- Department of Morphology and Animal Physiology, Federal Rural University of Pernambuco, Av. Dom Manoel de Medeiros, Recife, Pernambuco 52171-900, Brazil.
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21
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Pan J, Bhardwaj M, Zhang B, Chang WC, Schardl CL, Krebs C, Grossman RB, Bollinger JM. Installation of the Ether Bridge of Lolines by the Iron- and 2-Oxoglutarate-Dependent Oxygenase, LolO: Regio- and Stereochemistry of Sequential Hydroxylation and Oxacyclization Reactions. Biochemistry 2018. [PMID: 29537853 PMCID: PMC5895980 DOI: 10.1021/acs.biochem.8b00157] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
The core of the loline
family of insecticidal alkaloids is the
bicyclic pyrrolizidine unit with an additional strained ether bridge
between carbons 2 and 7. Previously reported genetic and in
vivo biochemical analyses showed that the presumptive iron-
and 2-oxoglutarate-dependent (Fe/2OG) oxygenase, LolO, is required
for installation of the ether bridge upon the pathway intermediate,
1-exo-acetamidopyrrolizidine (AcAP). Here we show
that LolO is, in fact, solely responsible for this biosynthetic four-electron
oxidation. In sequential 2OG- and O2-consuming steps, LolO
removes hydrogens from C2 and C7 of AcAP to form both carbon–oxygen
bonds in N-acetylnorloline (NANL), the precursor
to all other lolines. When supplied with substoichiometric 2OG, LolO
only hydroxylates AcAP. At higher 2OG:AcAP ratios, the enzyme further
processes the alcohol to the tricyclic NANL. Characterization of the
alcohol intermediate by mass spectrometry and nuclear magnetic resonance
spectroscopy shows that it is 2-endo-hydroxy-1-exo-acetamidopyrrolizidine (2-endo-OH-AcAP).
Kinetic and spectroscopic analyses of reactions with site-specifically
deuteriated AcAP substrates confirm that the C2–H bond is cleaved
first and that the responsible intermediate is, as expected, an FeIV–oxo (ferryl) complex. Analyses of the loline products
from cultures fed with stereospecifically deuteriated AcAP precursors,
proline and aspartic acid, establish that LolO removes the endo hydrogens
from C2 and C7 and forms both new C–O bonds with retention
of configuration. These findings delineate the pathway to an important
class of natural insecticides and lay the foundation for mechanistic
dissection of the chemically challenging oxacyclization reaction.
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Affiliation(s)
- Juan Pan
- Department of Chemistry and Department of Biochemistry and Molecular Biology , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | | | - Bo Zhang
- Department of Chemistry and Department of Biochemistry and Molecular Biology , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | - Wei-Chen Chang
- Department of Chemistry and Department of Biochemistry and Molecular Biology , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | | | - Carsten Krebs
- Department of Chemistry and Department of Biochemistry and Molecular Biology , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | | | - J Martin Bollinger
- Department of Chemistry and Department of Biochemistry and Molecular Biology , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States
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Screening of medium constituents for clavulanic acid production by Streptomyces clavuligerus. Braz J Microbiol 2018; 49:832-839. [PMID: 29588197 PMCID: PMC6175696 DOI: 10.1016/j.bjm.2018.01.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Revised: 01/19/2018] [Accepted: 01/24/2018] [Indexed: 11/22/2022] Open
Abstract
Clavulanic acid is a β-lactam compound with potent inhibitory activity against β-lactamases. Studies have shown that certain amino acids play essential roles in CA biosynthesis. However, quantitative evaluations of the effects of these amino acids are still needed in order to improve CA production. Here, we report a study of the nutritional requirements of Streptomyces clavuligerus for CA production. Firstly, the influence of the primary nitrogen source and the salts composition was investigated. Subsequently, soybean protein isolate was supplemented with arginine (0.0-3.20gL-1), threonine (0.0-1.44gL-1), ornithine (0.0-4.08gL-1), and glutamate (0.0-8.16gL-1), according to a two-level central composite rotatable design. A medium containing ferrous sulfate yielded CA production of 437mgL-1, while a formulation without this salt produced only 41mgL-1 of CA. This substantial difference suggested that Fe2+ is important for CA biosynthesis. The experimental design showed that glutamate and ornithine negatively influenced CA production while arginine and threonine had no influence. The soybean protein isolate provided sufficient C5 precursor for CA biosynthesis, so that supplementation was unnecessary. Screening of medium components, together with experimental design tools, could be a valuable way of enhancing CA titers and reducing the process costs.
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Pérez-Ruíz R, Lence E, Andreu I, Limones-Herrero D, González-Bello C, Miranda MA, Jiménez MC. A New Pathway for Protein Haptenation by β-Lactams. Chemistry 2017; 23:13986-13994. [PMID: 28791745 DOI: 10.1002/chem.201702643] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Indexed: 11/09/2022]
Abstract
The covalent binding of β-lactams to proteins upon photochemical activation has been demonstrated by using an integrated approach that combines photochemical, proteomic and computational studies, selecting human serum albumin (HSA) as a target protein and ezetimibe (1) as a probe. The results have revealed a novel protein haptenation pathway for this family of drugs that is an alternative to the known nucleophilic ring opening of β-lactams by the free amino group of lysine residues. Thus, photochemical ring splitting of the β-lactam ring, following a formal retro-Staudinger reaction, gives a highly reactive ketene intermediate that is trapped by the neighbouring lysine residues, leading to an amide adduct. For the investigated 1/HSA system, covalent modification of residues Lys414 and Lys525, which are located in sub-domains IIIA and IIIB, respectively, occurs. The observed photobinding may constitute the key step in the sequence of events leading to photoallergy. Docking and molecular dynamics simulation studies provide an insight into the molecular basis of the selectivity of 1 for these HSA sub-domains and the covalent modification mechanism. Computational studies also reveal positive cooperative binding of sub-domain IIIB that explains the experimentally observed modification of Lys414, which is located in a barely accessible pocket (sub-domain IIIA).
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Affiliation(s)
- Raúl Pérez-Ruíz
- Departamento de Química/Instituto de Tecnología Química UPV-CSIC, Universitat Politècnica de Valencia, Camino de Vera s/n, 46071, Valencia, Spain.,Present address: Instituto Imdea Energía, Parque Tecnológico de Móstoles, Av. Ramón de la Sagra, 3., 28935, Móstoles, Madrid, Spain
| | - Emilio Lence
- Centro Singular de Investigación en Química Biolóxica e Materiais, Moleculares (CIQUS) and Departamento de Química Orgánica, Universidade de Santiago de Compostela, calle Jenaro de la Fuente s/n, 15782, Santiago de Compostela, Spain
| | - Inmaculada Andreu
- Instituto de Investigación Sanitaria La Fe, Hospital Universitari i Politècnic La Fe, Avenida de Fernando Abril Martorell 106, 46026, Valencia, Spain
| | - Daniel Limones-Herrero
- Departamento de Química/Instituto de Tecnología Química UPV-CSIC, Universitat Politècnica de Valencia, Camino de Vera s/n, 46071, Valencia, Spain
| | - Concepción González-Bello
- Centro Singular de Investigación en Química Biolóxica e Materiais, Moleculares (CIQUS) and Departamento de Química Orgánica, Universidade de Santiago de Compostela, calle Jenaro de la Fuente s/n, 15782, Santiago de Compostela, Spain
| | - Miguel A Miranda
- Departamento de Química/Instituto de Tecnología Química UPV-CSIC, Universitat Politècnica de Valencia, Camino de Vera s/n, 46071, Valencia, Spain
| | - M Consuelo Jiménez
- Departamento de Química/Instituto de Tecnología Química UPV-CSIC, Universitat Politècnica de Valencia, Camino de Vera s/n, 46071, Valencia, Spain
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Qin R, Zhong C, Zong G, Fu J, Pang X, Cao G. Improvement of clavulanic acid production in Streptomyces clavuligerus F613-1 by using a claR - neo reporter strategy. ELECTRON J BIOTECHN 2017. [DOI: 10.1016/j.ejbt.2017.05.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
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25
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Wu LF, Meng S, Tang GL. Ferrous iron and α-ketoglutarate-dependent dioxygenases in the biosynthesis of microbial natural products. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2016; 1864:453-70. [DOI: 10.1016/j.bbapap.2016.01.012] [Citation(s) in RCA: 75] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Revised: 01/22/2016] [Accepted: 01/29/2016] [Indexed: 01/29/2023]
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26
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Torres MJ, Montañez MI, Ariza A, Salas M, Fernandez TD, Barbero N, Mayorga C, Blanca M. The role of IgE recognition in allergic reactions to amoxicillin and clavulanic acid. Clin Exp Allergy 2016; 46:264-74. [DOI: 10.1111/cea.12689] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- M. J. Torres
- Allergy Unit; IBIMA-Regional University Hospital of Malaga; Malaga Spain
| | - M. I. Montañez
- Research Laboratory; IBIMA-Regional University Hospital of Malaga; Malaga Spain
- BIONAND-Andalusian Centre for Nanomedicine and Biotechnology; Malaga Spain
| | - A. Ariza
- Research Laboratory; IBIMA-Regional University Hospital of Malaga; Malaga Spain
| | - M. Salas
- Allergy Unit; IBIMA-Regional University Hospital of Malaga; Malaga Spain
| | - T. D. Fernandez
- Research Laboratory; IBIMA-Regional University Hospital of Malaga; Malaga Spain
| | - N. Barbero
- BIONAND-Andalusian Centre for Nanomedicine and Biotechnology; Malaga Spain
- Department of Organic Chemistry; IBIMA; University of Malaga; Malaga Spain
| | - C. Mayorga
- Allergy Unit; IBIMA-Regional University Hospital of Malaga; Malaga Spain
- Research Laboratory; IBIMA-Regional University Hospital of Malaga; Malaga Spain
| | - M. Blanca
- Allergy Unit; IBIMA-Regional University Hospital of Malaga; Malaga Spain
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27
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Álvarez-Álvarez R, Botas A, Albillos SM, Rumbero A, Martín JF, Liras P. Molecular genetics of naringenin biosynthesis, a typical plant secondary metabolite produced by Streptomyces clavuligerus. Microb Cell Fact 2015; 14:178. [PMID: 26553209 PMCID: PMC4640377 DOI: 10.1186/s12934-015-0373-7] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Accepted: 10/29/2015] [Indexed: 01/07/2023] Open
Abstract
Background Some types of flavonoid intermediates seemed to be restricted to plants. Naringenin is a typical plant metabolite, that has never been reported to be produced in prokariotes. Naringenin is formed by the action of a chalcone synthase using as starter 4-coumaroyl-CoA, which in dicotyledonous plants derives from phenylalanine by the action of a phenylalanine ammonia lyase. Results A compound produced by Streptomyces clavuligerus has been identified by LC–MS and NMR as naringenin and coelutes in HPLC with a naringenin standard. Genome mining of S. clavuligerus revealed the presence of a gene for a chalcone synthase (ncs), side by side to a gene encoding a P450 cytochrome (ncyP) and separated from a gene encoding a Pal/Tal ammonia lyase (tal). Deletion of any of these genes results in naringenin non producer mutants. Complementation with the deleted gene restores naringenin production in the transformants. Furthermore, naringenin production increases in cultures supplemented with phenylalanine or tyrosine. Conclusion This is the first time that naringenin is reported to be produced naturally in a prokariote. Interestingly three non-clustered genes are involved in naringenin production, which is unusual for secondary metabolites. A tentative pathway for naringenin biosynthesis has been proposed. Electronic supplementary material The online version of this article (doi:10.1186/s12934-015-0373-7) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Rubén Álvarez-Álvarez
- Microbiology Section, Department of Molecular Biology, Faculty of Biology and Environmental Sciences, Vegazana Campus, University of León, León, 24071, Spain. .,Institute of Biotechnology, INBIOTEC, Av. Real 1, León, 24006, Spain.
| | - Alma Botas
- Institute of Biotechnology, INBIOTEC, Av. Real 1, León, 24006, Spain.
| | - Silvia M Albillos
- Institute of Biotechnology, INBIOTEC, Av. Real 1, León, 24006, Spain.
| | - Angel Rumbero
- Organic Chemistry Department, University Autónoma of Madrid, Cantoblanco, 28049, Madrid, Spain.
| | - Juan F Martín
- Microbiology Section, Department of Molecular Biology, Faculty of Biology and Environmental Sciences, Vegazana Campus, University of León, León, 24071, Spain.
| | - Paloma Liras
- Microbiology Section, Department of Molecular Biology, Faculty of Biology and Environmental Sciences, Vegazana Campus, University of León, León, 24071, Spain.
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28
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Structural insight into substrate preference for TET-mediated oxidation. Nature 2015; 527:118-22. [PMID: 26524525 DOI: 10.1038/nature15713] [Citation(s) in RCA: 197] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2015] [Accepted: 09/10/2015] [Indexed: 12/19/2022]
Abstract
DNA methylation is an important epigenetic modification. Ten-eleven translocation (TET) proteins are involved in DNA demethylation through iteratively oxidizing 5-methylcytosine (5mC) into 5-hydroxymethylcytosine (5hmC), 5-formylcytosine (5fC) and 5-carboxylcytosine (5caC). Here we show that human TET1 and TET2 are more active on 5mC-DNA than 5hmC/5fC-DNA substrates. We determine the crystal structures of TET2-5hmC-DNA and TET2-5fC-DNA complexes at 1.80 Å and 1.97 Å resolution, respectively. The cytosine portion of 5hmC/5fC is specifically recognized by TET2 in a manner similar to that of 5mC in the TET2-5mC-DNA structure, and the pyrimidine base of 5mC/5hmC/5fC adopts an almost identical conformation within the catalytic cavity. However, the hydroxyl group of 5hmC and carbonyl group of 5fC face towards the opposite direction because the hydroxymethyl group of 5hmC and formyl group of 5fC adopt restrained conformations through forming hydrogen bonds with the 1-carboxylate of NOG and N4 exocyclic nitrogen of cytosine, respectively. Biochemical analyses indicate that the substrate preference of TET2 results from the different efficiencies of hydrogen abstraction in TET2-mediated oxidation. The restrained conformation of 5hmC and 5fC within the catalytic cavity may prevent their abstractable hydrogen(s) adopting a favourable orientation for hydrogen abstraction and thus result in low catalytic efficiency. Our studies demonstrate that the substrate preference of TET2 results from the intrinsic value of its substrates at their 5mC derivative groups and suggest that 5hmC is relatively stable and less prone to further oxidation by TET proteins. Therefore, TET proteins are evolutionarily tuned to be less reactive towards 5hmC and facilitate the generation of 5hmC as a potentially stable mark for regulatory functions.
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29
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Costa CLL, Badino AC. Overproduction of clavulanic acid by extractive fermentation. ELECTRON J BIOTECHN 2015. [DOI: 10.1016/j.ejbt.2015.03.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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30
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Oliveira LM, Brites LM, Bustamante MCC, Parpot P, Teixeira JA, Mussatto SI, Barboza M. Fixed-Bed Column Process as a Strategy for Separation and Purification of Cephamycin C from Fermented Broth. Ind Eng Chem Res 2015. [DOI: 10.1021/ie504499z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Liliane M. Oliveira
- Post
Graduation Program in Chemical Engineering, Universidade Federal de São Carlos, Rodovia Washington Luiz, km 235, 13565-905 São Carlos, Brazil
| | - Luciana M. Brites
- Post
Graduation Program in Chemical Engineering, Universidade Federal de São Carlos, Rodovia Washington Luiz, km 235, 13565-905 São Carlos, Brazil
| | - Maritza C. C. Bustamante
- Post
Graduation Program in Chemical Engineering, Universidade Federal de São Carlos, Rodovia Washington Luiz, km 235, 13565-905 São Carlos, Brazil
| | | | | | - Solange I. Mussatto
- Department
of Biotechnology, Delft University of Technology, Julianalaan 67, 2628 BC Delft, The Netherlands
| | - Marlei Barboza
- Department
of Chemical Engineering, Universidade Federal do Triângulo Mineiro, Avenida Frei Paulino, 30, Bairro Abadia, 38025-180 Uberaba, Brazil
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31
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A 1.8-Mb-reduced Streptomyces clavuligerus genome: relevance for secondary metabolism and differentiation. Appl Microbiol Biotechnol 2013; 98:2183-95. [PMID: 24305736 DOI: 10.1007/s00253-013-5382-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Revised: 10/31/2013] [Accepted: 11/02/2013] [Indexed: 01/26/2023]
Abstract
A large part (21%) of the wild-type Streptomyces clavuligerus genome is located in a 1.8-Mb megaplasmid that greatly influences secondary metabolites biosynthesis even if the secondary metabolites are chromosomally encoded. The megaplasmid copy number may change depending on the nutritional and environmental conditions. The S. clavuligerus oppA2::aph mutant described by Lorenzana et al. (2004) does not form aerial mycelium, spores, and clavulanic acid, but overproduces holomycin. Transcriptomic studies, polymerase chain reactions (PCR), qPCR, and RT-qPCR analysis showed that S. clavuligerus oppA2::aph has a drastically reduced number of copies (about 25,000-fold lower than the parental strain) of plasmids pSCL1 (10.5 kb), pSCL2 (149.4 kb), and the megaplasmid pSCL4 (1.8 Mb). To clarify the role of the linear plasmids and the function of OppA2 in S. clavuligerus oppA2::aph we constructed oppA2 mutants which contained: (1) a normal copy number of the linear plasmids, (2) completely lack of the linear plasmids, and (3) a parA-parB pSCL4 mutant that resulted in lack of pSCL4. In addition, a strain with a functional oppA2 gene was constructed lacking the megaplasmid pSCL4. The results confirmed that the oppA2 gene is essential for clavulanic acid production, independently of the presence or absence of linear plasmids, but oppA2 has little relevance on differentiation. We demonstrated that the lack of sporulation of S. clavuligerus oppA2::aph is due to the absence of linear plasmids (particularly pSCL4) and the holomycin overproduction is largely due to the lack of pSCL4 and is stimulated by the oppA2 mutation.
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da Silva Vasconcelos E, de Lima VA, Goto LS, Cruz-Hernández IL, Hokka CO. Clavulanic acid production by the MMS 150 mutant obtained from wild type Streptomyces clavuligerus ATCC 27064. Braz J Microbiol 2013; 44:1049-57. [PMID: 24688492 PMCID: PMC3958168 DOI: 10.1590/s1517-83822014005000005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2011] [Accepted: 04/01/2013] [Indexed: 11/21/2022] Open
Abstract
Clavulanic acid (CA) is a powerful inhibitor of the beta-lactamases, enzymes produced by bacteria resistants to penicillin and cefalosporin. This molecule is produced industrially by strains of Streptomyces clavuligerus in complex media which carbon and nitrogen resources are supplied by inexpensive compounds still providing high productivity. The genetic production improvement using physical and chemical mutagenic agents is an important strategy in programs of industrial production development of bioactive metabolites. However, parental strains are susceptible to loss of their original productivity due genetic instability phenomenona. In this work, some S. clavuligerus mutant strains obtained by treatment with UV light and with MMS are compared with the wild type (Streptomyces clavuligerus ATCC 27064). The results indicated that the random mutations originated some strains with different phenotypes, most divergent demonstrated by the mutants strains named AC116, MMS 150 and MMS 54, that exhibited lack of pigmentation in their mature spores. Also, the strain MMS 150 presented a larger production of CA when cultivated in semi-synthetics media. Using other media, the wild type strain obtained a larger CA production. Besides, using the modifed complex media the MMS 150 strain showed changes in its lipolitic activity and a larger production of CA. The studies also allowed finding the best conditions for a lipase activity exhibited by wild type S. clavuligerus and the MMS150 mutant.
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Affiliation(s)
| | | | - Leandro Seiji Goto
- Departamento de Engenharia Química, Universidade Federal de São Carlos, São Carlos SP, Brazil
- Grupo de Biofísica Molecular “Sérgio Mascarenhas”, Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, SP, Brazil
| | | | - Carlos Osamu Hokka
- Departamento de Engenharia Química, Universidade Federal de São Carlos, São Carlos SP, Brazil
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33
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Kinetic Study on Cephamycin C Degradation. Appl Biochem Biotechnol 2013; 171:2121-8. [DOI: 10.1007/s12010-013-0502-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2013] [Accepted: 08/31/2013] [Indexed: 10/26/2022]
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Valegård K, Iqbal A, Kershaw NJ, Ivison D, Généreux C, Dubus A, Blikstad C, Demetriades M, Hopkinson RJ, Lloyd AJ, Roper DI, Schofield CJ, Andersson I, McDonough MA. Structural and mechanistic studies of the orf12 gene product from the clavulanic acid biosynthesis pathway. ACTA CRYSTALLOGRAPHICA SECTION D: BIOLOGICAL CRYSTALLOGRAPHY 2013; 69:1567-79. [PMID: 23897479 DOI: 10.1107/s0907444913011013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2013] [Accepted: 04/23/2013] [Indexed: 11/10/2022]
Abstract
Structural and biochemical studies of the orf12 gene product (ORF12) from the clavulanic acid (CA) biosynthesis gene cluster are described. Sequence and crystallographic analyses reveal two domains: a C-terminal penicillin-binding protein (PBP)/β-lactamase-type fold with highest structural similarity to the class A β-lactamases fused to an N-terminal domain with a fold similar to steroid isomerases and polyketide cyclases. The C-terminal domain of ORF12 did not show β-lactamase or PBP activity for the substrates tested, but did show low-level esterase activity towards 3'-O-acetyl cephalosporins and a thioester substrate. Mutagenesis studies imply that Ser173, which is present in a conserved SXXK motif, acts as a nucleophile in catalysis, consistent with studies of related esterases, β-lactamases and D-Ala carboxypeptidases. Structures of wild-type ORF12 and of catalytic residue variants were obtained in complex with and in the absence of clavulanic acid. The role of ORF12 in clavulanic acid biosynthesis is unknown, but it may be involved in the epimerization of (3S,5S)-clavaminic acid to (3R,5R)-clavulanic acid.
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Affiliation(s)
- Karin Valegård
- Department of Molecular Biology, Swedish University of Agricultural Sciences, Box 590, S-751 24 Uppsala, Sweden
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Paradkar A. Clavulanic acid production by Streptomyces clavuligerus: biogenesis, regulation and strain improvement. J Antibiot (Tokyo) 2013; 66:411-20. [DOI: 10.1038/ja.2013.26] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Revised: 02/25/2013] [Accepted: 03/11/2013] [Indexed: 11/09/2022]
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Kurt A, Álvarez-Álvarez R, Liras P, Özcengiz G. Role of the cmcH–ccaR intergenic region and ccaR overexpression in cephamycin C biosynthesis in Streptomyces clavuligerus. Appl Microbiol Biotechnol 2013; 97:5869-80. [DOI: 10.1007/s00253-013-4721-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Revised: 01/14/2013] [Accepted: 01/15/2013] [Indexed: 01/08/2023]
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Haga RB, Santos-Ebinuma VC, de Siqueira Cardoso Silva M, Pessoa A, Rangel-Yagui CO. Clavulanic acid partitioning in charged aqueous two-phase micellar systems. Sep Purif Technol 2013. [DOI: 10.1016/j.seppur.2012.10.034] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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38
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Hamed RB, Gomez-Castellanos JR, Henry L, Ducho C, McDonough MA, Schofield CJ. The enzymes of β-lactam biosynthesis. Nat Prod Rep 2013; 30:21-107. [DOI: 10.1039/c2np20065a] [Citation(s) in RCA: 146] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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39
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Biosynthesis of clavam metabolites. ACTA ACUST UNITED AC 2012; 39:1407-19. [DOI: 10.1007/s10295-012-1191-0] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2012] [Accepted: 08/22/2012] [Indexed: 01/06/2023]
Abstract
Abstract
Naturally occurring clavam metabolites include the valuable β-lactamase inhibitor, clavulanic acid, as well as stereochemical variants with side-chain modifications, called the 5S clavams. Because of the clinical importance of clavulanic acid, most studies of clavam biosynthesis are based on the industrial producer species Streptomyces clavuligerus. Well-characterized early steps in clavam biosynthesis are outlined, and less well understood late steps in 5S clavam biosynthesis are proposed. The complex genetic organization of the clavam biosynthetic genes in S. clavuligerus is described and, where possible, comparisons with other producer species are presented.
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Goomeshi Nobary S, Jensen SE. A comparison of the clavam biosynthetic gene clusters in Streptomyces antibioticus Tü1718 and Streptomyces clavuligerus. Can J Microbiol 2012; 58:413-25. [PMID: 22435762 DOI: 10.1139/w2012-012] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The production of clavam metabolites has been studied previously in Streptomyces clavuligerus , a species that produces clavulanic acid as well as 4 other clavam compounds, but the late steps of the pathway leading to the specific end products are unclear. The present study compared the clavam biosynthetic gene cluster in Streptomyces antibioticus , chosen because it produces only 2 clavam metabolites and no clavulanic acid, with that of S. clavuligerus. A cosmid library of S. antibioticus genomic DNA was screened with a clavaminate synthase-specific probe based on the corresponding genes from S. clavuligerus, and 1 of the hybridizing cosmids was sequenced in full. A clavam gene cluster was identified that shows similarities to that of S. clavuligerus but also contains a number of novel genes. Knock-out mutation of the clavaminate synthase gene abolished clavam production in S. antibioticus, confirming the identity of the gene cluster. Knock-out mutation of a novel gene encoding an apparent oxidoreductase also abolished clavam production. A potential clavam biosynthetic pathway consistent with the genes in the cluster and the metabolites produced by S. antibioticus, and correspondingly different from that of S. clavuligerus, is proposed.
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Affiliation(s)
- Sarah Goomeshi Nobary
- Department of Biological Sciences, University of Alberta, Edmonton, AB T6G 2E9, Canada
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Mantri M, Zhang Z, McDonough MA, Schofield CJ. Autocatalysed oxidative modifications to 2-oxoglutarate dependent oxygenases. FEBS J 2012; 279:1563-75. [DOI: 10.1111/j.1742-4658.2012.08496.x] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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42
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Sydor PK, Challis GL. Oxidative tailoring reactions catalyzed by nonheme iron-dependent enzymes: streptorubin B biosynthesis as an example. Methods Enzymol 2012; 516:195-218. [PMID: 23034230 DOI: 10.1016/b978-0-12-394291-3.00002-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Abstract
Tailoring enzymes catalyze reactions that modify natural product backbone structures before, during, or after their biosynthesis to create a final product with specific biological activities. Such reactions can be catalyzed by a myriad of different enzyme families and are responsible for a wide variety of transformations including regio- and/or stereospecific acylation, alkylation, glycosylation, halogenation, and oxidation. Within a broad group of oxidative tailoring enzymes, there is a rapidly growing family of nonheme iron- and oxygen-dependent enzymes that catalyze a variety of remarkable hydroxylation, desaturation, halogenation, and oxidative cyclization reaction in the biosynthesis of several important metabolites, including carbapenems, penicillins, cephalosporins, clavams, prodiginines, fosfomycin, syringomycin, and coronatine. In this chapter, we report an expedient method for analyzing tailoring enzymes that catalyze oxidative cyclization reactions in prodiginine biosynthesis via expression of the corresponding genes in a heterologous host, feeding of putative biosynthetic intermediates to the resulting strains, and liquid chromatography-mass spectrometry analyses of the metabolites produced.
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Affiliation(s)
- Paulina K Sydor
- Department of Chemistry, University of Warwick, Coventry, United Kingdom
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de Baptista Neto Á, Bustamante MCC, de Oliveira JHHL, Granato AC, Bellão C, Junior ACB, Barboza M, Hokka CO. Preliminary Studies for Cephamycin C Purification Technique. Appl Biochem Biotechnol 2011; 166:208-21. [DOI: 10.1007/s12010-011-9417-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2011] [Accepted: 10/18/2011] [Indexed: 10/15/2022]
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Forte MBS, Rodrigues MI, Filho FM. Clavulanic Acid Adsorption Studies in Zeolites. ADSORPT SCI TECHNOL 2011. [DOI: 10.1260/0263-6174.29.4.391] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Affiliation(s)
- Marcus Bruno Soares Forte
- Laboratory of Bioprocess Engineering, Food Engineering Department, Faculty of Food Engineering, University of Campinas (UNICAMP), R. Monteiro Lobato, 80, Campinas-SP, Brazil, 13083-862
| | - Maria Isabel Rodrigues
- Laboratory of Bioprocess Engineering, Food Engineering Department, Faculty of Food Engineering, University of Campinas (UNICAMP), R. Monteiro Lobato, 80, Campinas-SP, Brazil, 13083-862
| | - Francisco Maugeri Filho
- Laboratory of Bioprocess Engineering, Food Engineering Department, Faculty of Food Engineering, University of Campinas (UNICAMP), R. Monteiro Lobato, 80, Campinas-SP, Brazil, 13083-862
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Guedes de Andrade E, de Siqueira Cardoso Silva M, Brandão Haga R, Carvalho Santos V, Pessoa A, Rangel-Yagui CDO. Extraction of clavulanic acid using aqueous two-phase micellar system. Biotechnol Appl Biochem 2011. [DOI: 10.1002/bab.20] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Abstract
The development of new catalytic methods to functionalize carbon-hydrogen (C-H) bonds continues to progress at a rapid pace due to the significant economic and environmental benefits of these transformations over traditional synthetic methods. In nature, enzymes catalyze regio- and stereoselective C-H bond functionalization using transformations ranging from hydroxylation to hydroalkylation under ambient reaction conditions. The efficiency of these enzymes relative to analogous chemical processes has led to their increased use as biocatalysts in preparative and industrial applications. Furthermore, unlike small molecule catalysts, enzymes can be systematically optimized via directed evolution for a particular application and can be expressed in vivo to augment the biosynthetic capability of living organisms. While a variety of technical challenges must still be overcome for practical application of many enzymes for C-H bond functionalization, continued research on natural enzymes and on novel artificial metalloenzymes will lead to improved synthetic processes for efficient synthesis of complex molecules. In this critical review, we discuss the most prevalent mechanistic strategies used by enzymes to functionalize non-acidic C-H bonds, the application and evolution of these enzymes for chemical synthesis, and a number of potential biosynthetic capabilities uniquely enabled by these powerful catalysts (110 references).
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Affiliation(s)
| | - Pedro S. Coelho
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 E. California Blvd., MC210-41, Pasadena, CA 91125-4100, USA
| | - Frances H. Arnold
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 E. California Blvd., MC210-41, Pasadena, CA 91125-4100, USA
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Nárdiz N, Santamarta I, Lorenzana LM, Martín JF, Liras P. A rhodanese-like protein is highly overrepresented in the mutant S. clavuligerus oppA2::aph: effect on holomycin and other secondary metabolites production. Microb Biotechnol 2011; 4:216-25. [PMID: 21342467 PMCID: PMC3818862 DOI: 10.1111/j.1751-7915.2010.00222.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2010] [Accepted: 09/12/2010] [Indexed: 12/27/2022] Open
Abstract
A protein highly overrepresented in the proteome of Streptomyces clavuligerus oppA2::aph was characterized by MS/MS as a rhodanese-like enzyme. The rhlA gene, encoding this protein, was deleted from strains S. clavuligerus ATCC 27064 and S. clavuligerus oppA2::aph to characterized the RhlA enzyme activity, growth on different sulfur sources and antibiotic production by the mutants. Whereas total thiosulfate sulfurtransferase activity in cell extracts was not affected by the rhlA deletion, growth, cephamycin C and clavulanic acid production were impaired in the rhlA mutants. Holomycin production was drastically reduced (66-90%) in the rhlA mutants even when using S. clavuligerusΔrhlA pregrown cells, suggesting that this enzyme might be involved in the formation of the cysteine precursor for this sulfur-containing antibiotic. While growth on thiosulfate as the sole sulfur source was particularly low the volumetric and specific antibiotic production of the three antibiotics increased in all the strains in the presence of thiosulfate. This stimulatory effect of thiosulfate on antibiotic production was confirmed by addition of thiosulfate to pre-grown cells and appears to be a general effect of thiosulfate on oxidative stress as was also evident in the production of staurosporin by S. clavuligerus.
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Affiliation(s)
- Nuria Nárdiz
- Área de Microbiología, Facultad de Ciencias Biológicas y Ambientales, Universidad de León, 24071 León, Spain
- Instituto de Biotecnología, INBIOTEC, Parque Científico de León, Avda. Real n°1, 24006 León, Spain
| | - Irene Santamarta
- Área de Microbiología, Facultad de Ciencias Biológicas y Ambientales, Universidad de León, 24071 León, Spain
- Instituto de Biotecnología, INBIOTEC, Parque Científico de León, Avda. Real n°1, 24006 León, Spain
| | - Luis M. Lorenzana
- Instituto de Biotecnología, INBIOTEC, Parque Científico de León, Avda. Real n°1, 24006 León, Spain
| | - Juan F. Martín
- Área de Microbiología, Facultad de Ciencias Biológicas y Ambientales, Universidad de León, 24071 León, Spain
- Instituto de Biotecnología, INBIOTEC, Parque Científico de León, Avda. Real n°1, 24006 León, Spain
| | - Paloma Liras
- Área de Microbiología, Facultad de Ciencias Biológicas y Ambientales, Universidad de León, 24071 León, Spain
- Instituto de Biotecnología, INBIOTEC, Parque Científico de León, Avda. Real n°1, 24006 León, Spain
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Improvement of clavulanic acid production in Streptomyces clavuligerus by genetic manipulation of structural biosynthesis genes. Biotechnol Lett 2011; 33:1221-6. [DOI: 10.1007/s10529-011-0561-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2010] [Accepted: 02/02/2011] [Indexed: 11/24/2022]
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Teodoro JC, Baptista-Neto A, Araujo MLGC, Hokka CO, Badino AC. Influence of glycerol and ornithine feeding on clavulanic acid production by Streptomyces clavuligerus. BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING 2010. [DOI: 10.1590/s0104-66322010000400001] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Song JY, Jensen SE, Lee KJ. Clavulanic acid biosynthesis and genetic manipulation for its overproduction. Appl Microbiol Biotechnol 2010; 88:659-69. [DOI: 10.1007/s00253-010-2801-2] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2010] [Revised: 07/26/2010] [Accepted: 07/27/2010] [Indexed: 12/27/2022]
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