1
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Severance ZC, Nuñez JI, Le-McClain AT, Malinky CA, Bensen RC, Fogle RS, Manginelli GW, Sakers SH, Falcon EC, Bui RH, Snead KJ, Bourne CR, Burgett AWG. Structure-Activity Relationships of Ligand Binding to Oxysterol-Binding Protein (OSBP) and OSBP-Related Protein 4. J Med Chem 2023; 66:3866-3875. [PMID: 36916802 PMCID: PMC10786236 DOI: 10.1021/acs.jmedchem.2c01025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
Abstract
Oxysterol-binding protein (OSBP) and OSBP-related protein 4 (ORP4) have emerged as potentially druggable targets in antiviral and precision cancer drug development. Multiple structurally diverse small molecules function through targeting the OSBP/ORP family of proteins, including the antiviral steroidal compounds OSW-1 and T-00127-HEV2. Here, the structure-activity relationships of oxysterols and related compound binding to human OSBP and ORP4 are characterized. Oxysterols with hydroxylation at various side chain positions (i.e., C-20, C-24, C-25, and C-27)─but not C-22─confer high affinity interactions with OSBP and ORP4. A library of 20(S)-hydroxycholesterol analogues with varying sterol side chains reveal that side chain length modifications are not well tolerated for OSBP and ORP4 interactions. This side chain requirement is contradicted by the high affinity binding of T-00127-HEV2, a steroidal compound lacking the side chain. The binding results, in combination with docking studies using homology models of OSBP and ORP4, suggest multiple modes of steroidal ligand binding to OSBP and ORP4.
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Affiliation(s)
- Zachary C Severance
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
- Department of Pharmaceutical Sciences, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma 73117, United States
| | - Juan I Nuñez
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Anh T Le-McClain
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Cori A Malinky
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Ryan C Bensen
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Robert S Fogle
- Department of Pharmaceutical Sciences, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma 73117, United States
| | - Gianni W Manginelli
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Sophia H Sakers
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Emily C Falcon
- Department of Pharmaceutical Sciences, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma 73117, United States
| | - Richard Hoang Bui
- Department of Pharmaceutical Sciences, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma 73117, United States
| | - Kevin J Snead
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Christina R Bourne
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Anthony W G Burgett
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
- Department of Pharmaceutical Sciences, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma 73117, United States
- Stephenson Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma 73104, United States
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2
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Bensen RC, Standke SJ, Colby DH, Kothapalli NR, Le-McClain AT, Patten MA, Tripathi A, Heinlen JE, Yang Z, Burgett AWG. Single Cell Mass Spectrometry Quantification of Anticancer Drugs: Proof of Concept in Cancer Patients. ACS Pharmacol Transl Sci 2021; 4:96-100. [PMID: 33615163 DOI: 10.1021/acsptsci.0c00156] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Indexed: 11/30/2022]
Abstract
In clinical cancer medicine, the current inability to quantify intracellular chemotherapy drug concentrations in individual human cells limits the personalization and overall effectiveness of drug administration. New bioanalytical methods capable of real-time measurement of drug levels in live single cancer cells would allow for more adaptive and personalized administration of chemotherapy drugs, potentially leading to better clinical outcomes with fewer side effects. In this study, we report the development of a new quantitative single cell mass spectrometry (qSCMS) method capable of providing absolute drug amounts and concentrations in single cancer cells. Using this qSCMS system, quantitative analysis of the intracellular drug gemcitabine present in individual bladder cancer cells is reported, including in bladder cancer cells isolated from patients undergoing standard-of-care gemcitabine chemotherapy. The development of single cell pharmacology bioanalytical methods can potentially lead to more effective and safely administered drug medications in patients, especially in the treatment of cancer.
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Affiliation(s)
- Ryan C Bensen
- Department of Chemistry & Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - Shawna J Standke
- Department of Chemistry & Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - Devon H Colby
- Department of Chemistry & Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - Naga Rama Kothapalli
- Department of Chemistry & Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - Anh T Le-McClain
- Department of Chemistry & Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - Michael A Patten
- Oklahoma Biological Survey, University of Oklahoma, 111 E. Chesapeake Street, Norman, Oklahoma 73019, United States
| | - Abhishek Tripathi
- Stephenson Cancer Center, Section of Hematology Oncology, University of Oklahoma Health Sciences Center; 800 NE 10th Street, Oklahoma City, Oklahoma 73104, United States
| | - Jonathan E Heinlen
- Department of Urology, University of Oklahoma Health Sciences Center, 920 Stanton L. Young Boulevard, Oklahoma City, Oklahoma 73104, United States
| | - Zhibo Yang
- Department of Chemistry & Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - Anthony W G Burgett
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Oklahoma Health Sciences Center, 1110 N. Stonewall Avenue, Oklahoma City, Oklahoma 73117, United States
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3
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Bensen RC, Gunay G, Finneran MC, Jhingan I, Acar H, Burgett AWG. Small Molecule Targeting of Oxysterol-Binding Protein (OSBP)-Related Protein 4 and OSBP Inhibits Ovarian Cancer Cell Proliferation in Monolayer and Spheroid Cell Models. ACS Pharmacol Transl Sci 2021; 4:744-756. [PMID: 33860198 DOI: 10.1021/acsptsci.0c00207] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2020] [Indexed: 12/17/2022]
Abstract
The development of precision drugs for the selective treatment of ovarian cancer will require targeting proliferative factors selectively expressed in ovarian tumors or targeting unique physiological microenvironments specific for ovarian tumors. Here, we report that oxysterol-binding protein (OSBP)-related protein 4 (ORP4) is a potential druggable precision target in ovarian cancer cells. ORP4 has limited expression in normal tissues and was recently recognized to be a cancer-specific driver of cellular proliferation, including in patient-isolated leukemias. We demonstrate that ORP4 is strongly expressed in a panel of ovarian cancer cell lines. The antiproliferative natural product compound OSW-1 targets ORP4 and OSBP. Our results demonstrate that the OSW-1 compound has high antiproliferative potency in both monolayer and three-dimensional ovarian cancer spheroid models, especially compared to the standard-of-care agents cisplatin and paclitaxel. OSW-1 compound treatment induces a loss of ORP4 expression after 48 h, which is coincident with the cytotoxic effects of OSW-1. The absence of extracellular lipids markedly potentiated the cytotoxicity of OSW-1, which was reversed by addition of extracellular free cholesterol. OSBP, but not ORP4, is reported to transport cholesterol and other lipids between organelles. Our results indicate that the targeting of ORP4 is responsible for the antiproliferative activity of the OSW-1 compound, but that in the absence of exogenously supplied cholesterol, which might be similar to the in vivo ovarian cancer microenvironment, possible OSW-1 targeting of OSBP further potentiates the anticancer activity of the compound. Overall, ORP4 and potentially OSBP are revealed as potential druggable targets for the development of novel treatments for ovarian cancer.
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Affiliation(s)
- Ryan C Bensen
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Gokhan Gunay
- Stephenson School of Biomedical Engineering, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Matthew C Finneran
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Isha Jhingan
- Stephenson School of Biomedical Engineering, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Handan Acar
- Stephenson School of Biomedical Engineering, University of Oklahoma, Norman, Oklahoma 73019, United States.,Stephenson Cancer Center, University of Oklahoma, Oklahoma City, Oklahoma 73104, United States
| | - Anthony W G Burgett
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States.,Department of Pharmaceutical Sciences, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma 73117, United States.,Stephenson Cancer Center, University of Oklahoma, Oklahoma City, Oklahoma 73104, United States
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4
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Torres-Ayuso P, An E, Nyswaner KM, Bensen RC, Ritt DA, Specht SI, Das S, Andresson T, Cachau RE, Liang RJ, Ries AL, Robinson CM, Difilippantonio S, Gouker B, Bassel L, Karim BO, Miller CJ, Turk BE, Morrison DK, Brognard J. TNIK Is a Therapeutic Target in Lung Squamous Cell Carcinoma and Regulates FAK Activation through Merlin. Cancer Discov 2021; 11:1411-1423. [PMID: 33495197 DOI: 10.1158/2159-8290.cd-20-0797] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 11/21/2020] [Accepted: 01/20/2021] [Indexed: 12/14/2022]
Abstract
Lung squamous cell carcinoma (LSCC) is the second most prevalent type of lung cancer. Despite extensive genomic characterization, no targeted therapies are approved for the treatment of LSCC. Distal amplification of the 3q chromosome is the most frequent genomic alteration in LSCC, and there is an urgent need to identify efficacious druggable targets within this amplicon. We identify the protein kinase TNIK as a therapeutic target in LSCC. TNIK is amplified in approximately 50% of LSCC cases. TNIK genetic depletion or pharmacologic inhibition reduces the growth of LSCC cells in vitro and in vivo. In addition, TNIK inhibition showed antitumor activity and increased apoptosis in established LSCC patient-derived xenografts. Mechanistically, we identified the tumor suppressor Merlin/NF2 as a novel TNIK substrate and showed that TNIK and Merlin are required for the activation of focal adhesion kinase. In conclusion, our data identify targeting TNIK as a potential therapeutic strategy in LSCC. SIGNIFICANCE: Targeted therapies have not yet been approved for the treatment of LSCC, due to lack of identification of actionable cancer drivers. We define TNIK catalytic activity as essential for maintaining LSCC viability and validate the antitumor efficacy of TNIK inhibition in preclinical models of LSCC.This article is highlighted in the In This Issue feature, p. 1307.
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Affiliation(s)
- Pedro Torres-Ayuso
- Laboratory of Cell and Developmental Signaling, Center for Cancer Research, NCI, Frederick, Maryland.
| | - Elvira An
- Laboratory of Cell and Developmental Signaling, Center for Cancer Research, NCI, Frederick, Maryland
| | - Katherine M Nyswaner
- Laboratory of Cell and Developmental Signaling, Center for Cancer Research, NCI, Frederick, Maryland
| | - Ryan C Bensen
- Laboratory of Cell and Developmental Signaling, Center for Cancer Research, NCI, Frederick, Maryland
| | - Daniel A Ritt
- Laboratory of Cell and Developmental Signaling, Center for Cancer Research, NCI, Frederick, Maryland
| | - Suzanne I Specht
- Laboratory of Cell and Developmental Signaling, Center for Cancer Research, NCI, Frederick, Maryland
| | - Sudipto Das
- Protein Characterization Laboratory, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Thorkell Andresson
- Protein Characterization Laboratory, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Raul E Cachau
- Advanced Biomedical Computational Science, Biomedical Informatics and Data Science, Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Roger J Liang
- Laboratory of Cell and Developmental Signaling, Center for Cancer Research, NCI, Frederick, Maryland
| | - Amy L Ries
- Laboratory Animal Sciences Program, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Christina M Robinson
- Laboratory Animal Sciences Program, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Simone Difilippantonio
- Laboratory Animal Sciences Program, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Brad Gouker
- Molecular Histopathology Laboratory, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Laura Bassel
- Molecular Histopathology Laboratory, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Baktiar O Karim
- Molecular Histopathology Laboratory, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Chad J Miller
- Department of Pharmacology, Yale School of Medicine, New Haven, Connecticut
| | - Benjamin E Turk
- Department of Pharmacology, Yale School of Medicine, New Haven, Connecticut
| | - Deborah K Morrison
- Laboratory of Cell and Developmental Signaling, Center for Cancer Research, NCI, Frederick, Maryland
| | - John Brognard
- Laboratory of Cell and Developmental Signaling, Center for Cancer Research, NCI, Frederick, Maryland.
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5
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Roberts BL, Severance ZC, Bensen RC, Le-McClain AT, Malinky CA, Mettenbrink EM, Nuñez JI, Reddig WJ, Blewett EL, Burgett AWG. Differing activities of oxysterol-binding protein (OSBP) targeting anti-viral compounds. Antiviral Res 2019; 170:104548. [PMID: 31271764 PMCID: PMC10786240 DOI: 10.1016/j.antiviral.2019.104548] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 06/25/2019] [Accepted: 06/29/2019] [Indexed: 11/27/2022]
Abstract
Oxysterol-binding Protein (OSBP) is a human lipid-transport protein required for the cellular replication of many types of viruses, including several human pathogens. The structurally-diverse small molecule compounds OSW-1, itraconazole (ITZ), T-00127-HEV2 (THEV) and TTP-8307 (TTP) inhibit viral replication through interaction with the OSBP protein. The OSW-1 compound reduces intracellular OSBP, and the reduction of OSBP protein levels persists multiple days after the OSW-1-compound treatment is stopped. The OSW-1-induced reduction of OSBP levels inhibited Enterovirus replication prophylactically in cells. In this report, the OSBP-interacting compounds ITZ, THEV, and TTP are shown not to reduce OSBP levels in cells, unlike the OSW-1-compound, and the OSW-1 compound is determined to be the only compound capable of providing prophylactic antiviral activity in cells. Furthermore, OSW-1 and THEV inhibit the binding of 25-hydroxycholesterol (25-OHC) to OSBP indicating that these compounds bind at the conserved sterol ligand binding site. The ITZ and TTP compounds do not inhibit 25-hydroxycholesterol binding to OSBP, and therefore ITZ and TTP interact with OSBP through other, unidentified binding sites. Co-administration of the THEV compound partially blocks the cellular activity of OSW-1, including the reduction of cellular OSBP protein levels; co-administration of the ITZ and TTP compounds have minimal effect on OSW-1 cellular activity further supporting different modes of interaction with these compounds to OSBP. OSW-1, ITZ, THEV, and TTP treatment alter OSBP cellular localization and levels, but in four distinct ways. Co-administration of OSW-1 and ITZ induced OSBP cellular localization patterns with features similar to the effects of ITZ and OSW-1 treatment alone. Based on these results, OSBP is capable of interacting with multiple structural classes of antiviral small molecule compounds at different binding sites, and the different compounds have distinct effects on OSBP cellular activity.
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Affiliation(s)
- Brett L Roberts
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK, United States
| | - Zachary C Severance
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK, United States
| | - Ryan C Bensen
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK, United States
| | - Anh T Le-McClain
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK, United States
| | - Cori A Malinky
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK, United States
| | - Evan M Mettenbrink
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK, United States
| | - Juan I Nuñez
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK, United States
| | - William J Reddig
- Department of Biochemistry and Microbiology, Oklahoma State University Center for Health Sciences, Tulsa, OK, United States
| | - Earl L Blewett
- Department of Biochemistry and Microbiology, Oklahoma State University Center for Health Sciences, Tulsa, OK, United States
| | - Anthony W G Burgett
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK, United States.
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6
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Pan N, Standke SJ, Kothapalli NR, Sun M, Bensen RC, Burgett AWG, Yang Z. Quantification of Drug Molecules in Live Single Cells Using the Single-Probe Mass Spectrometry Technique. Anal Chem 2019; 91:9018-9024. [PMID: 31246408 PMCID: PMC6677389 DOI: 10.1021/acs.analchem.9b01311] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Analyzing cellular constituents on the single-cell level through mass spectrometry (MS) allows for a wide range of compounds to be studied simultaneously. However, there is a need for quantitative single-cell mass spectrometry (qSCMS) methods to fully characterize drug efficacy from individual cells within cell populations. In this study, qSCMS experiments were carried out using the Single-probe MS technique. The method was successfully used to perform rapid absolute quantifications of the anticancer drug irinotecan in individual mammalian cancer cells under ambient conditions in real time. Traditional liquid chromatography/mass spectrometry (LC/MS) quantifications of irinotecan in cell lysate samples were used to compare the results from Single-probe qSCMS. This technique showcases heterogeneity of drug efficacy on the single-cell level.
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Affiliation(s)
- Ning Pan
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Shawna J. Standke
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Naga Rama Kothapalli
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Mei Sun
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Ryan C. Bensen
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Anthony W. G. Burgett
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Zhibo Yang
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
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7
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Standke SJ, Colby DH, Bensen RC, Burgett AWG, Yang Z. Integrated Cell Manipulation Platform Coupled with the Single-probe for Mass Spectrometry Analysis of Drugs and Metabolites in Single Suspension Cells. J Vis Exp 2019. [PMID: 31282898 DOI: 10.3791/59875] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Single cell mass spectrometry (SCMS) enables sensitive detection and accurate analysis of broad ranges of cellular species on the individual-cell level. The single-probe, a microscale sampling and ionization device, can be coupled with a mass spectrometer for on-line, rapid SCMS analysis of cellular constituents under ambient conditions. Previously, the single-probe SCMS technique was primarily used to measure cells immobilized onto a substrate, limiting the types of cells for studies. In the current study, the single-probe SCMS technology has been integrated with a cell manipulation system, typically used for in vitro fertilization. This integrated cell manipulation and analysis platform uses a cell-selection probe to capture identified individual floating cells and transfer the cells to the single-probe tip for microscale lysis, followed by immediate mass spectrometry analysis. This capture and transfer process removes the cells from the surrounding solution prior to analysis, minimizing the introduction of matrix molecules in the mass spectrometry analysis. This integrated setup is capable of SCMS analysis of targeted patient-isolated cells present in body fluids samples (e.g., urine, blood, saliva, etc.), allowing for potential applications of SCMS analysis to human medicine and disease biology.
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Affiliation(s)
- Shawna J Standke
- Department of Chemistry and Biochemistry, University of Oklahoma
| | - Devon H Colby
- Department of Chemistry and Biochemistry, University of Oklahoma
| | - Ryan C Bensen
- Department of Chemistry and Biochemistry, University of Oklahoma
| | | | - Zhibo Yang
- Department of Chemistry and Biochemistry, University of Oklahoma;
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8
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Bandari C, Scull EM, Bavineni T, Nimmo SL, Gardner ED, Bensen RC, Burgett AW, Singh S. FgaPT2, a biocatalytic tool for alkyl-diversification of indole natural products. Medchemcomm 2019; 10:1465-1475. [PMID: 31534661 PMCID: PMC6748273 DOI: 10.1039/c9md00177h] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Accepted: 06/05/2019] [Indexed: 01/02/2023]
Abstract
Demonstration of FgaPT2 catalyzed alkyl-diversification of indole containing natural products.
Aromatic prenyltransferases from natural product biosynthetic pathways display relaxed specificity for their aromatic substrates. While a growing body of evidence suggests aromatic prenyltransferases to be more tolerant towards their alkyl-donor substrates, most studies aimed at probing their donor-substrate specificity are limited to only a small set of alkyl pyrophosphate donors, restricting their broader utility as biocatalysts for synthetic applications. Here, we assess the donor substrate specificity of an l-tryptophan C4-prenyltransferase, also known as C4-dimethylallyltryptophan synthase, FgaPT2 from Aspergillus fumigatus, using an array of 34 synthetic unnatural alkyl-pyrophosphate analogues, and demonstrate FgaPT2 can catalyze the transfer of 25 of the 34 non-native alkyl groups from their corresponding synthetic alkyl-pyrophosphate analogues at N1, C3, C4 and C5 position of tryptophan in a normal and reverse manner. The kinetic studies and regio-chemical analysis of the alkyl-l-tryptophan products suggest that the alkyl-donor transfer by FgaPT2 is a function of the stability of the carbocation and the steric factors in the active site of the enzyme. Further, to demonstrate the biocatalytic utility of FgaPT2, this study also highlights the FgaPT2-catalyzed synthesis of a small set of alkyl-diversified indolocarbazole analogues. These results reveal FgaPT2 to be more tolerant to diverse non-native alkyl-donor substrates beyond their known acceptor substrate promiscuity and set the stage for its development as a novel biocatalytic tool for the differential alkylation of natural products for drug discovery and other synthetic applications.
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Affiliation(s)
- Chandrasekhar Bandari
- Department of Chemistry and Biochemistry , University of Oklahoma , Stephenson Life Sciences Research Center , 101 Stephenson Parkway , Norman , Oklahoma 73019 , USA .
| | - Erin M Scull
- Department of Chemistry and Biochemistry , University of Oklahoma , Stephenson Life Sciences Research Center , 101 Stephenson Parkway , Norman , Oklahoma 73019 , USA .
| | - Tejaswi Bavineni
- Department of Chemistry and Biochemistry , University of Oklahoma , Stephenson Life Sciences Research Center , 101 Stephenson Parkway , Norman , Oklahoma 73019 , USA .
| | - Susan L Nimmo
- Department of Chemistry and Biochemistry , University of Oklahoma , Stephenson Life Sciences Research Center , 101 Stephenson Parkway , Norman , Oklahoma 73019 , USA .
| | - Eric D Gardner
- Department of Chemistry and Biochemistry , University of Oklahoma , Stephenson Life Sciences Research Center , 101 Stephenson Parkway , Norman , Oklahoma 73019 , USA .
| | - Ryan C Bensen
- Department of Chemistry and Biochemistry , University of Oklahoma , Stephenson Life Sciences Research Center , 101 Stephenson Parkway , Norman , Oklahoma 73019 , USA .
| | - Anthony W Burgett
- Department of Chemistry and Biochemistry , University of Oklahoma , Stephenson Life Sciences Research Center , 101 Stephenson Parkway , Norman , Oklahoma 73019 , USA .
| | - Shanteri Singh
- Department of Chemistry and Biochemistry , University of Oklahoma , Stephenson Life Sciences Research Center , 101 Stephenson Parkway , Norman , Oklahoma 73019 , USA .
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9
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Roberts BL, Severance ZC, Bensen RC, Le AT, Kothapalli NR, Nuñez JI, Ma H, Wu S, Standke SJ, Yang Z, Reddig WJ, Blewett EL, Burgett AWG. Transient Compound Treatment Induces a Multigenerational Reduction of Oxysterol-Binding Protein (OSBP) Levels and Prophylactic Antiviral Activity. ACS Chem Biol 2019; 14:276-287. [PMID: 30576108 PMCID: PMC6379863 DOI: 10.1021/acschembio.8b00984] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
![]()
Oxysterol-binding
protein (OSBP) is a lipid transport and regulatory
protein required for the replication of Enterovirus genus viruses, which includes many significant human pathogens.
Short-term exposure (i.e., 1–6 h) to a low dose (i.e., 1 nM)
of the natural product compound OSW-1 induces a reduction of cellular
OSBP levels by ∼90% in multiple different cell lines with no
measurable cytotoxicity, defect in cellular proliferation, or global
proteome reduction. Interestingly, the reduction of OSBP levels persists
multiple days after the low-dose, transient OSW-1 compound treatment
is ended and the intracellular OSW-1 compound levels drop to undetectable
levels. The reduction in OSBP levels is inherited in multiple generations
of cells that are propagated after the OSW-1 compound treatment is
stopped. The enduring multiday, multigenerational reduction of OSBP
levels triggered by the OSW-1 compound is not due to proteasome degradation
of OSBP or due to a reduction in OSBP mRNA levels. OSW-1 compound
treatment induces transient autophagy in cells, but blocking autophagy
does not rescue OSBP levels. Although the specific cellular mechanism
of long-term OSBP repression is not yet identified, these results
clearly show the existence of an OSBP specific cellular regulation
process that is triggered upon treatment with an OSBP-binding compound.
The stable reduction of OSBP levels upon short-term, transient OSW-1
compound treatment will be a powerful tool to understand OSBP regulation
and cellular function. Additionally, the persistent reduction in OSBP
levels triggered by the transient OSW-1 compound treatment substantially
reduces viral replication in treated cells. Therefore, the long-term,
compound-induced reduction of OSBP in cells presents a new route to
broad spectrum anti-Enterovirus activity, including
as a novel route to antiviral prophylactic treatment through small
molecule targeting a human host protein.
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Affiliation(s)
- Brett L. Roberts
- Department of Chemistry and Biochemistry, The University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - Zachary C. Severance
- Department of Chemistry and Biochemistry, The University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - Ryan C. Bensen
- Department of Chemistry and Biochemistry, The University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - Anh T. Le
- Department of Chemistry and Biochemistry, The University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - Naga Rama Kothapalli
- Department of Chemistry and Biochemistry, The University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - Juan I. Nuñez
- Department of Chemistry and Biochemistry, The University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - Hongyan Ma
- Department of Chemistry and Biochemistry, The University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - Si Wu
- Department of Chemistry and Biochemistry, The University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - Shawna J. Standke
- Department of Chemistry and Biochemistry, The University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - Zhibo Yang
- Department of Chemistry and Biochemistry, The University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - William J. Reddig
- Department of Biochemistry and Microbiology, Oklahoma State University Center for Health Sciences, 1111 West 17th Street, Tulsa, Oklahoma 74107, United States
| | - Earl L. Blewett
- Department of Biochemistry and Microbiology, Oklahoma State University Center for Health Sciences, 1111 West 17th Street, Tulsa, Oklahoma 74107, United States
| | - Anthony W. G. Burgett
- Department of Chemistry and Biochemistry, The University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
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Standke SJ, Colby DH, Bensen RC, Burgett AWG, Yang Z. Mass Spectrometry Measurement of Single Suspended Cells Using a Combined Cell Manipulation System and a Single-Probe Device. Anal Chem 2019; 91:1738-1742. [PMID: 30644722 DOI: 10.1021/acs.analchem.8b05774] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Existing single cell mass spectrometry (SCMS) sampling platforms are largely designed to work only with immobilized cells and not the suspended cells isolated from patient samples. Here, we present a novel method that integrates a commercially available cell manipulation system commonly used for in vitro fertilization with the Single-probe SCMS sampling technology. The combined Single-probe SCMS/cell manipulating platform is capable of rapidly analyzing intracellular species in real time from a suspension leukemia cell line. A broad range of molecular species was detected, and species of interest were verified using tandem MS (MS/MS). Experimental results were analyzed utilizing statistical analyses such as principle component analysis (PCA) and t-tests. The developed SCMS/cell manipulation system is a versatile tool to provide rapid single cell analysis of broad types of patient cell samples.
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Affiliation(s)
- Shawna J Standke
- Department of Chemistry and Biochemistry , University of Oklahoma , Norman , Oklahoma 73019 , United States
| | - Devon H Colby
- Department of Chemistry and Biochemistry , University of Oklahoma , Norman , Oklahoma 73019 , United States
| | - Ryan C Bensen
- Department of Chemistry and Biochemistry , University of Oklahoma , Norman , Oklahoma 73019 , United States
| | - Anthony W G Burgett
- Department of Chemistry and Biochemistry , University of Oklahoma , Norman , Oklahoma 73019 , United States
| | - Zhibo Yang
- Department of Chemistry and Biochemistry , University of Oklahoma , Norman , Oklahoma 73019 , United States
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