1
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Abstract
Collagen and hyaluronan are the most abundant components of the extracellular matrix (ECM) and their overexpression in tumors is linked to increased tumor growth and metastasis. These ECM components contribute to a protective tumor microenvironment by supporting a high interstitial fluid pressure and creating a tortuous setting for the convection and diffusion of chemotherapeutic small molecules, antibodies, and nanoparticles in the tumor interstitial space. This review focuses on the research efforts to deplete extracellular collagen with collagenases to normalize the tumor microenvironment. Although collagen synthesis inhibitors are in clinical development, the use of collagenases is contentious and clinically untested in cancer patients. Pretreatment of murine tumors with collagenases increased drug uptake and diffusion 2-10-fold. This modest improvement resulted in decreased tumor growth, but the benefits of collagenase treatment are confounded by risks of toxicity from collagen breakdown in healthy tissues. In this review, we evaluate the published in vitro and in vivo benefits and limitations of collagenase treatment to improve drug delivery.
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Affiliation(s)
- Aaron Dolor
- Pharmaceutical Sciences and Pharmacogenomics Graduate Program, University of California, San Francisco, California. Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, San Francisco, 94143
| | - Francis C. Szoka
- Pharmaceutical Sciences and Pharmacogenomics Graduate Program, University of California, San Francisco, California. Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, San Francisco, 94143
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2
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Prely L, Klein T, Geurink PP, Paal K, Overkleeft HS, Bischoff R. Activity-Dependent Photoaffinity Labeling of Metalloproteases. Methods Mol Biol 2017; 1491:103-111. [PMID: 27778284 DOI: 10.1007/978-1-4939-6439-0_8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Metalloproteases, notably members of the matrix metalloprotease (MMP) and A Disintegrin And Metalloprotease (ADAM) families play crucial roles in tissue remodeling, the liberation of growth factors and cytokines from cell membranes (shedding) and cell-cell or cell-matrix interactions. Activity of MMPs or ADAMs must therefore be tightly controlled in time and space by activation of pro-enzymes upon appropriate stimuli and inhibition by endogenous tissue inhibitors of metalloproteases (TIMPs) or α2-macroglobulin to prevent irreversible tissue damage due to excessive degradation or uncontrolled release of potent inflammatory mediators, such as tumor necrosis factor-α (TNF-α).Although there is a wide range of methods to measure the amount of metalloproteases based on immunological approaches, relatively little is known about the activation status of a given enzyme at any given time and location. This information is, however, critical in order to understand the function and possible implication of these enzymes in disease. Since metalloproteases use an active-site bound water molecule to cleave the peptide bond, it is not possible to apply known active-site-directed labeling approaches with electrophilic "warheads." We therefore developed novel metalloprotease inhibitors that contain a photoactivatable trifluoromethylphenyldiazirine group and show that such inhibitors are suitable for activity-dependent photoaffinity labeling of MMPs and ADAMs.
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Affiliation(s)
- Laurette Prely
- Department of Pharmacy, Analytical Biochemistry, University of Groningen, Antonius Deusinglaan 1, 9713, AV, Groningen, The Netherlands
| | - Theo Klein
- Department of Pharmacy, Analytical Biochemistry, University of Groningen, Antonius Deusinglaan 1, 9713, AV, Groningen, The Netherlands
| | - Paul P Geurink
- Leiden Institute of Chemistry and the Netherlands Proteomics Center, Leiden University, Einsteinweg 55, 2300, RA, Leiden, The Netherlands
| | - Krisztina Paal
- Department of Pharmacy, Analytical Biochemistry, University of Groningen, Antonius Deusinglaan 1, 9713, AV, Groningen, The Netherlands
| | - Herman S Overkleeft
- Bio-Organic Synthesis Groups, Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2300, RA, Leiden, The Netherlands
| | - Rainer Bischoff
- Department of Pharmacy, Analytical Biochemistry, University of Groningen, Antonius Deusinglaan 1, 9713, AV, Groningen, The Netherlands.
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3
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Expression, purification, refolding and in vitro recovery of active full length recombinant human gelatinase MMP-9 in Escherichia coli. Protein Expr Purif 2016; 126:42-48. [PMID: 27164034 DOI: 10.1016/j.pep.2016.04.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Revised: 03/31/2016] [Accepted: 04/28/2016] [Indexed: 11/24/2022]
Abstract
Human gelatinase (MMP-9) is a member of matrix metalloproteinases family (MMPs), which has been associated with malignant tumor progression and metastasis by matrix degradation. Herein, active full length recombinant human MMP-9 (amino acid residues 107-707) has been expressed in the form of inclusion bodies in Escherichia coli BL21, using pET21a vector. Solubilization of inclusion bodies was carried out in Tris-HCl buffer with 6 M urea, and refolding was performed using dilution and urea gradient methods. Tris-HCl buffer with 5 mM CaCl2 and 1 μM ZnCl2 at pH 7.8 was used as a refolding buffer. Analysis of the structure by fluorescence and far-UV circular dichroism showed a well-formed structure by urea gradient method. Kinetic parameters in refolding conditions of rhMMP-9 were also analyzed, depicting increase in the enzyme's activity without any aggregation.
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4
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Abstract
Substrate cleavage by metalloproteinases involves nucleophilic attack on the scissile peptide bond by a water molecule that is polarized by a catalytic metal, usually a zinc ion, and a general base, usually the carboxyl group of a glutamic acid side chain. The zinc ion is most often complexed by imidazole nitrogens of histidine side chains. This arrangement suggests that the physiological pH optimum of most metalloproteinases is in the neutral range. In addition to their catalytic metal ion, many metalloproteinases contain additional transition metal or alkaline earth ions, which are structurally important or modulate the catalytic activity. As a consequence, these enzymes are generally sensitive to metal chelators. Moreover, the catalytic metal can be displaced by adventitious metal ions from buffers or biological fluids, which may fundamentally alter the catalytic function. Therefore, handling, purification, and assaying of metalloproteinases require specific precautions to warrant their stability.
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Affiliation(s)
- Sven Fridrich
- Johannes Gutenberg University Mainz, Institute of Zoology, Cell and Matrix Biology, Germany
| | - Konstantin Karmilin
- Johannes Gutenberg University Mainz, Institute of Zoology, Cell and Matrix Biology, Germany
| | - Walter Stöcker
- Johannes Gutenberg University Mainz, Institute of Zoology, Cell and Matrix Biology, Germany
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5
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Qi X, Sun Y, Xiong S. A single freeze-thawing cycle for highly efficient solubilization of inclusion body proteins and its refolding into bioactive form. Microb Cell Fact 2015; 14:24. [PMID: 25879903 PMCID: PMC4343044 DOI: 10.1186/s12934-015-0208-6] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Accepted: 02/13/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Mild solubilization of inclusion bodies has attracted attention in recent days, with an objective to preserve the existing native-like secondary structure of proteins, reduce protein aggregation during refolding and recovering high amount of bioactive proteins from inclusion bodies. RESULTS Here we presented an efficient method for mild solubilization of inclusion bodies by using a freeze-thawing process in the presence of low concentration of urea. We used two different proteins to demonstrate the advantage of this method over the traditional urea-denatured method: enhanced green fluorescent protein (EGFP) and the catalytic domain of human macrophage metalloelastase (MMP-12_CAT). Firstly, PBS buffer at pH 8 containing different molar concentration of urea (0-8 M) were used to solubilize EGFP and MMP-12-CAT inclusion bodies and the solubility achieved in 2 M urea in PBS buffer by freeze-thawing method was comparable to that of PBS buffer containing 8 M urea by traditional urea-denatured method. Secondly, different solvents were used to solubilize EGFP and MMP-12_CAT from inclusion bodies and the results indicated that a wide range of buffers containing 2 M urea could efficiently solubilize EGFP and MMP-12_CAT inclusion bodies by freeze-thawing method. Thirdly, the effect of pH and freezing temperature on the solubility of EGFP and MMP-12_CAT inclusion bodies were studied, revealing that solubilization of inclusion bodies by freeze-thawing method is pH dependent and the optimal freezing temperature indicated here is -20°C. Forth, the solubilized EGFP and MMP-12_CAT from inclusion bodies were refolded by rapid dilution and dialysis, respectively. The results showed that the refolded efficiency is much higher (more than twice) from freeze-thawing method than the traditional urea-denatured method. The freeze-thawing method containing 2 M urea also effectively solubilized a number of proteins as inclusion bodies in E.coli. CONCLUSIONS Mild solubilization of inclusion body proteins using the freeze-thawing method is simple, highly efficient and generally applicable. The method can be utilized to prepare large quantities of bioactive soluble proteins from inclusion bodies for basic research and industrial purpose.
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Affiliation(s)
- Xingmei Qi
- Jiangsu Key Laboratory of Infection and Immunity, Institutes of Biology and Medical Sciences, Soochow University, Suzhou, Jiangsu, 215123, China.
| | - Yifan Sun
- Jiangsu Key Laboratory of Infection and Immunity, Institutes of Biology and Medical Sciences, Soochow University, Suzhou, Jiangsu, 215123, China.
| | - Sidong Xiong
- Jiangsu Key Laboratory of Infection and Immunity, Institutes of Biology and Medical Sciences, Soochow University, Suzhou, Jiangsu, 215123, China.
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6
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Ambidextrous binding of cell and membrane bilayers by soluble matrix metalloproteinase-12. Nat Commun 2014; 5:5552. [PMID: 25412686 DOI: 10.1038/ncomms6552] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2014] [Accepted: 10/10/2014] [Indexed: 01/15/2023] Open
Abstract
Matrix metalloproteinases (MMPs) regulate tissue remodelling, inflammation and disease progression. Some soluble MMPs are inexplicably active near cell surfaces. Here we demonstrate the binding of MMP-12 directly to bilayers and cellular membranes using paramagnetic NMR and fluorescence. Opposing sides of the catalytic domain engage spin-labelled membrane mimics. Loops project from the β-sheet interface to contact the phospholipid bilayer with basic and hydrophobic residues. The distal membrane interface comprises loops on the other side of the catalytic cleft. Both interfaces mediate MMP-12 association with vesicles and cell membranes. MMP-12 binds plasma membranes and is internalized to hydrophobic perinuclear features, the nuclear membrane and inside the nucleus within minutes. While binding of TIMP-2 to MMP-12 hinders membrane interactions beside the active site, TIMP-2-inhibited MMP-12 binds vesicles and cells, suggesting compensatory rotation of its membrane approaches. MMP-12 association with diverse cell membranes may target its activities to modulate innate immune responses and inflammation.
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7
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Matusiak N, Castelli R, Tuin AW, Overkleeft HS, Wisastra R, Dekker FJ, Prély LM, Bischoff R, Bischoff RPM, van Waarde A, Dierckx RAJO, Elsinga PH. A dual inhibitor of matrix metalloproteinases and a disintegrin and metalloproteinases, [¹⁸F]FB-ML5, as a molecular probe for non-invasive MMP/ADAM-targeted imaging. Bioorg Med Chem 2014; 23:192-202. [PMID: 25438884 DOI: 10.1016/j.bmc.2014.11.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Revised: 11/06/2014] [Accepted: 11/06/2014] [Indexed: 11/17/2022]
Abstract
BACKGROUND Numerous clinical studies have shown a correlation between increased matrix metalloproteinase (MMP)/a disintegrin and metalloproteinase (ADAM) activity and poor outcome of cancer. Various MMP inhibitors (MMPIs) have been developed for therapeutic purposes in oncology. In addition, molecular imaging of MMP/ADAM levels in vivo would allow the diagnosis of tumors. We selected the dual inhibitor of MMPs and ADAMs, ML5, which is a hydroxamate-based inhibitor with affinities for many MMPs and ADAMs. ML5 was radiolabelled with (18)F and the newly obtained radiolabelled inhibitor was evaluated in vitro and in vivo. MATERIALS AND METHODS ML5 was radiolabelled by direct acylation with N-succinimidyl-4-[(18)F]fluorobenzoate ([(18)F]SFB) for PET (positron emission tomography). The resulting radiotracer [(18)F]FB-ML5 was evaluated in vitro in human bronchial epithelium 16HBE cells and breast cancer MCF-7 cells. The non-radioactive probe FB-ML5 and native ML5 were tested in a fluorogenic inhibition assay against MMP-2, -9, -12 and ADAM-17. The in vivo kinetics of [(18)F]FB-ML5 were examined in a HT1080 tumor-bearing mouse model. Specificity of probe binding was examined by co-injection of 0 or 2.5mg/kg ML5. RESULTS ML5 and FB-ML5 showed high affinity for MMP-2, -9, -12 and ADAM-17; indeed IC50 values were respectively 7.4 ± 2.0, 19.5 ± 2.8, 2.0 ± 0.2 and 5.7 ± 2.2 nM and 12.5 ± 3.1, 31.5 ± 13.7, 138.0 ± 10.9 and 24.7 ± 2.8 nM. Radiochemical yield of HPLC-purified [(18)F]FB-ML5 was 13-16% (corrected for decay). Cellular binding of [(18)F]FB-ML5 was reduced by 36.6% and 27.5% in MCF-7 and 16 HBE cells, respectively, after co-incubation with 10 μM of ML5. In microPET scans, HT1080 tumors exhibited a low and homogeneous uptake of the tracer. Tumors of mice injected with [(18)F]FB-ML5 showed a SUVmean of 0.145 ± 0.064 (n=6) which decreased to 0.041 ± 0.027 (n=6) after target blocking (p<0.05). Ex vivo biodistribution showed a rapid excretion through the kidneys and the liver. Metabolite assays indicated that the parent tracer represented 23.2 ± 7.3% (n=2) of total radioactivity in plasma, at 90 min post injection (p.i.). CONCLUSION The nanomolar affinity MMP/ADAM inhibitor ML5 was successfully labelled with (18)F. [(18)F]FB-ML5 demonstrated rather low binding in ADAM-17 overexpressing cell lines. [(18)F]FB-ML5 uptake showed significant reduction in the HT1080 tumor in vivo after co-injection of ML5. [(18)F]FB-ML5 may be suitable for the visualization/quantification of diseases overexpressing simultaneously MMPs and ADAMs.
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Affiliation(s)
- Nathalie Matusiak
- Department of Nuclear Medicine and Molecular Imaging, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9700 RB Groningen, The Netherlands
| | - Riccardo Castelli
- Leiden Institute of Chemistry, Leiden University, Leiden, The Netherlands
| | - Adriaan W Tuin
- Leiden Institute of Chemistry, Leiden University, Leiden, The Netherlands
| | | | - Rosalina Wisastra
- Department of Pharmaceutical Gene Modulation, Groningen Research Institute of Pharmacy, University of Groningen, Groningen, The Netherlands
| | - Frank J Dekker
- Department of Pharmaceutical Gene Modulation, Groningen Research Institute of Pharmacy, University of Groningen, Groningen, The Netherlands
| | - Laurette M Prély
- Department of Analytical Biochemistry, Groningen Research Institute of Pharmacy, University of Groningen, Groningen, The Netherlands
| | | | - Rainer P M Bischoff
- Department of Analytical Biochemistry, Groningen Research Institute of Pharmacy, University of Groningen, Groningen, The Netherlands
| | - Aren van Waarde
- Department of Nuclear Medicine and Molecular Imaging, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9700 RB Groningen, The Netherlands
| | - Rudi A J O Dierckx
- Department of Nuclear Medicine and Molecular Imaging, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9700 RB Groningen, The Netherlands
| | - Philip H Elsinga
- Department of Nuclear Medicine and Molecular Imaging, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9700 RB Groningen, The Netherlands.
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8
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Abstract
The development of affinity tags has greatly simplified protein purification procedures. A variety of affinity tags are now available to improve expression, solubility, and/or tag removal. In this chapter, we describe a method for purifying recombinant proteins expressed in Escherichia coli that uses a highly specific, inducible, C-terminal autoprocessing protease tag. This method streamlines affinity purification, cleavage, and tag separation into a one-step purification procedure, avoiding the need to remove fusion tags from target proteins with exogenous proteases. In addition to accelerating protein purification, we show that this method can enhance the expression, stability, and solubility of select proteins.
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Affiliation(s)
- Aimee Shen
- Department of Microbiology and Molecular Genetics, University of Vermont, 95 Carrigan Drive, Burlington, VT, 05405, USA,
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9
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Morell M, Duc TN, Willis AL, Syed S, Lee J, Deu E, Deng Y, Xiao J, Turk BE, Jessen JR, Weiss SJ, Bogyo M. Coupling protein engineering with probe design to inhibit and image matrix metalloproteinases with controlled specificity. J Am Chem Soc 2013; 135:9139-48. [PMID: 23701445 PMCID: PMC3722588 DOI: 10.1021/ja403523p] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Matrix metalloproteinases (MMPs) are zinc endopeptidases that play roles in numerous pathophysiological processes and therefore are promising drug targets. However, the large size of this family and a lack of highly selective compounds that can be used for imaging or inhibition of specific MMPs members has limited efforts to better define their biological function. Here we describe a protein engineering strategy coupled with small-molecule probe design to selectively target individual members of the MMP family. Specifically, we introduce a cysteine residue near the active-site of a selected protease that does not alter its overall activity or function but allows direct covalent modification by a small-molecule probe containing a reactive electrophile. This specific engineered interaction between the probe and the target protease provides a means to both image and inhibit the modified protease with absolute specificity. Here we demonstrate the feasibility of the approach for two distinct MMP proteases, MMP-12 and MT1-MMP (or MMP-14).
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Affiliation(s)
- Montse Morell
- Department of Pathology, University School of Medicine, Stanford University, Stanford, CA 94305 USA
| | - Thinh Nguyen Duc
- Department of Pathology, University School of Medicine, Stanford University, Stanford, CA 94305 USA
| | - Amanda L. Willis
- Division of Molecular Medicine and Genetics, Department of Internal Medicine, Life Sciences Institute, University of Michigan, Ann Arbor, MI 48109 USA
| | - Salahuddin Syed
- Department of Pathology, University School of Medicine, Stanford University, Stanford, CA 94305 USA
| | - Jiyoun Lee
- Department of Pathology, University School of Medicine, Stanford University, Stanford, CA 94305 USA
| | - Edgar Deu
- Department of Pathology, University School of Medicine, Stanford University, Stanford, CA 94305 USA
| | - Yang Deng
- Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520 USA
| | - Junpeng Xiao
- Department of Pathology, University School of Medicine, Stanford University, Stanford, CA 94305 USA
| | - Benjamin E. Turk
- Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520 USA
| | - Jason R. Jessen
- Department of Medicine/Division of Genetic Medicine, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Stephen J. Weiss
- Division of Molecular Medicine and Genetics, Department of Internal Medicine, Life Sciences Institute, University of Michigan, Ann Arbor, MI 48109 USA
| | - Matthew Bogyo
- Department of Pathology, University School of Medicine, Stanford University, Stanford, CA 94305 USA
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10
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Nguyen TTH, Moon YH, Ryu YB, Kim YM, Nam SH, Kim MS, Kimura A, Kim D. The influence of flavonoid compounds on the in vitro inhibition study of a human fibroblast collagenase catalytic domain expressed in E. coli. Enzyme Microb Technol 2012. [PMID: 23199735 DOI: 10.1016/j.enzmictec.2012.10.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The human fibroblast collagenase catalytic domain (MMP1ca) that is considered a prototype for all interstitial collagenase and plays an important role in the turnover of collagen fibrils in the matrix was expressed as an inclusion body in the Escherichia coli. The purified enzyme displayed activity with substrate Dnp-Pro-Leu-Ala-Leu-Trp-Ala-Arg-OH with a K(m) value of 26.61±1.42 μM. The inhibition activity of the nine flavonoid compounds and gallic acid against MMP1ca was examined. Among the compounds tested, the IC(50) of seven flavonoid compounds were determined and ranged from 14.13 to 339.21 μM. Epigallocatechin gallate (EGCG) showed the highest inhibition toward MMP1ca with IC(50) values of 14.13±0.49 μM. EGCG showed a competitive inhibition pattern with a K(i) value of 10.47±0.51 μM. The free binding energy of EGCG against MMP1ca was -13.07 kcal mol(-1), which was calculated by using Autodock 3.0.5 software and showed numerous hydrophobic and hydrogen bond interactions. The galloyl group of EGCG, gallocatechin gallate and epicatechin gallate was determined to be important for inhibitory activity against MMP1ca.
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Affiliation(s)
- Thi Thanh Hanh Nguyen
- School of Biological Sciences and Technology, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 500-757, Republic of Korea
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11
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Fulcher YG, Van Doren SR. Remote exosites of the catalytic domain of matrix metalloproteinase-12 enhance elastin degradation. Biochemistry 2011; 50:9488-99. [PMID: 21967233 DOI: 10.1021/bi2009807] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
How does matrix metalloproteinase-12 (MMP-12 or metalloelastase) degrade elastin with high specific activity? Nuclear magnetic resonance suggested soluble elastin covers surfaces of MMP-12 far from its active site. Two of these surfaces have been found, by mutagenesis guided by the BINDSIght approach, to affect degradation and affinity for elastin substrates but not a small peptide substrate. Main exosite 1 has been extended to Asp124 that binds calcium. Novel exosite 2 comprises residues from the II-III loop and β-strand I near the back of the catalytic domain. The high degree of exposure of these distal exosites may make them accessible to elastin made more flexible by partial hydrolysis. Importantly, the combination of one lesion each at exosites 1 and 2 and the active site decreased the catalytic competence toward soluble elastin by 13-18-fold to the level of MMP-3, homologue and poor elastase. Double-mutant cycle analysis of conservative mutations of Met156 (exosite 2) and either Asp124 (exosite 1) or Ile180 (active site) showed they had additive effects. Compared to polar substitutions observed in other MMPs, Met156 enhanced affinity and Ile180 the k(cat) for soluble elastin. Both residues detracted from the higher folding stability with polar mutations. This resembles the trend in enzymes of an inverse relationship between folding stability and activity. Restoring Asp124 from combination mutants enhanced the k(cat) for soluble elastin. In elastin degradation, exosites 1 and 2 contributed in a manner independent of each other and Ile180 at the active site, but with partial coupling to Ala182 near the active site. The concept of weak, separated interactions coalescing somewhat independently can be extended to this proteolytic digestion of a protein from fibrils.
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Affiliation(s)
- Yan G Fulcher
- Department of Biochemistry, University of Missouri, Columbia, Missouri 65211, United States
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12
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Yang Z, Zhang L, Zhang Y, Zhang T, Feng Y, Lu X, Lan W, Wang J, Wu H, Cao C, Wang X. Highly efficient production of soluble proteins from insoluble inclusion bodies by a two-step-denaturing and refolding method. PLoS One 2011; 6:e22981. [PMID: 21829569 PMCID: PMC3146519 DOI: 10.1371/journal.pone.0022981] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2010] [Accepted: 07/11/2011] [Indexed: 11/18/2022] Open
Abstract
The production of recombinant proteins in a large scale is important for protein functional and structural studies, particularly by using Escherichia coli over-expression systems; however, approximate 70% of recombinant proteins are over-expressed as insoluble inclusion bodies. Here we presented an efficient method for generating soluble proteins from inclusion bodies by using two steps of denaturation and one step of refolding. We first demonstrated the advantages of this method over a conventional procedure with one denaturation step and one refolding step using three proteins with different folding properties. The refolded proteins were found to be active using in vitro tests and a bioassay. We then tested the general applicability of this method by analyzing 88 proteins from human and other organisms, all of which were expressed as inclusion bodies. We found that about 76% of these proteins were refolded with an average of >75% yield of soluble proteins. This “two-step-denaturing and refolding” (2DR) method is simple, highly efficient and generally applicable; it can be utilized to obtain active recombinant proteins for both basic research and industrial purposes.
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Affiliation(s)
- Zhong Yang
- State Key Laboratory of Genetic Engineering, Department of Microbiology, School of Life Sciences, Fudan University, Shanghai, China
- State Key Laboratory of Bioreactor Engineering, School of Biotechnology, East China University of Science and Technology, Shanghai, China
| | - Linlin Zhang
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, CAS, Shanghai, China
- State Key Laboratory of Bioreactor Engineering, School of Biotechnology, East China University of Science and Technology, Shanghai, China
| | - Yan Zhang
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, CAS, Shanghai, China
| | - Ting Zhang
- State Key Laboratory of Bioreactor Engineering, School of Biotechnology, East China University of Science and Technology, Shanghai, China
| | - Yanye Feng
- State Key Laboratory of Genetic Engineering, Department of Microbiology, School of Life Sciences, Fudan University, Shanghai, China
- State Key Laboratory of Bioreactor Engineering, School of Biotechnology, East China University of Science and Technology, Shanghai, China
| | - Xiuxiu Lu
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, CAS, Shanghai, China
| | - Wenxian Lan
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, CAS, Shanghai, China
| | - Jufang Wang
- School of Bioscience and Bioengineering, South China University of Science and Technology, Guangzhou, China
| | - Houming Wu
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, CAS, Shanghai, China
| | - Chunyang Cao
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, CAS, Shanghai, China
- * E-mail: (CC); (XW)
| | - Xiaoning Wang
- State Key Laboratory of Genetic Engineering, Department of Microbiology, School of Life Sciences, Fudan University, Shanghai, China
- School of Bioscience and Bioengineering, South China University of Science and Technology, Guangzhou, China
- * E-mail: (CC); (XW)
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13
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Geurink PP, Klein T, Prèly L, Paal K, Leeuwenburgh MA, van der Marel GA, Kauffman HF, Overkleeft HS, Bischoff R. Design of Peptide Hydroxamate-Based Photoreactive Activity-Based Probes of Zinc-Dependent Metalloproteases. European J Org Chem 2010. [DOI: 10.1002/ejoc.200901385] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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14
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Shen A, Lupardus PJ, Morell M, Ponder EL, Sadaghiani AM, Garcia KC, Bogyo M. Simplified, enhanced protein purification using an inducible, autoprocessing enzyme tag. PLoS One 2009; 4:e8119. [PMID: 19956581 PMCID: PMC2780291 DOI: 10.1371/journal.pone.0008119] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2009] [Accepted: 11/05/2009] [Indexed: 01/08/2023] Open
Abstract
We introduce a new method for purifying recombinant proteins expressed in bacteria using a highly specific, inducible, self-cleaving protease tag. This tag is comprised of the Vibrio cholerae MARTX toxin cysteine protease domain (CPD), an autoprocessing enzyme that cleaves exclusively after a leucine residue within the target protein-CPD junction. Importantly, V. cholerae CPD is specifically activated by inositol hexakisphosphate (InsP6), a eukaryotic-specific small molecule that is absent from the bacterial cytosol. As a result, when His6-tagged CPD is fused to the C-terminus of target proteins and expressed in Escherichia coli, the full-length fusion protein can be purified from bacterial lysates using metal ion affinity chromatography. Subsequent addition of InsP6 to the immobilized fusion protein induces CPD-mediated cleavage at the target protein-CPD junction, releasing untagged target protein into the supernatant. This method condenses affinity chromatography and fusion tag cleavage into a single step, obviating the need for exogenous protease addition to remove the fusion tag(s) and increasing the efficiency of tag separation. Furthermore, in addition to being timesaving, versatile, and inexpensive, our results indicate that the CPD purification system can enhance the expression, integrity, and solubility of intractable proteins from diverse organisms.
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Affiliation(s)
- Aimee Shen
- Department of Pathology, Stanford School of Medicine, Stanford, California, United States of America
| | - Patrick J. Lupardus
- Department of Molecular and Cellular Physiology, Stanford School of Medicine, Stanford, California, United States of America
| | - Montse Morell
- Department of Pathology, Stanford School of Medicine, Stanford, California, United States of America
| | - Elizabeth L. Ponder
- Department of Pathology, Stanford School of Medicine, Stanford, California, United States of America
| | - A. Masoud Sadaghiani
- Department of Systems and Chemical Biology, Stanford School of Medicine, Stanford, California, United States of America
| | - K. Christopher Garcia
- Department of Molecular and Cellular Physiology, Stanford School of Medicine, Stanford, California, United States of America
- Howard Hughes Institute, Stanford School of Medicine, Stanford, California, United States of America
| | - Matthew Bogyo
- Department of Pathology, Stanford School of Medicine, Stanford, California, United States of America
- * E-mail:
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15
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Bhaskaran R, Palmier MO, Lauer-Fields JL, Fields GB, Van Doren SR. MMP-12 catalytic domain recognizes triple helical peptide models of collagen V with exosites and high activity. J Biol Chem 2008; 283:21779-88. [PMID: 18539597 DOI: 10.1074/jbc.m709966200] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Matrix metalloproteinase (MMP)-12 (or metalloelastase) efficiently hydrolyzed the gelatinase-selective alpha1(V)436-447 fluorescent triple helical peptide (THP) when the substrate was submicromolar. The sequence of this THP was derived from collagen V, a component of collagen I fibrils. The hemopexin domains of MMP-12 and -9 each increased k(cat)/K(m) toward this substrate by decreasing K(m), just as the hemopexin domain of MMP-1 enhances its triple helical peptidase activity. Non-fluorescent alpha1(V) THP subtly perturbed amide NMR chemical shifts of MMP-12 not only in the active site cleft but also at remote sites of the beta-sheet and adjoining loops. The alpha1(V) THP protected MMP-12 from the NMR line broadening effects of Gd .EDTA in the active site cleft and more dramatically in the V-B loop next to the primed subsites. Mutagenesis of the exosite in the V-B loop at Thr-205 and His-206 that vary among MMP sequences established that this site supports the high specific activity toward alpha1(V) fluorescent THP without affecting general MMP activity. Surprisingly the alpha1(V) THP also protected novel surfaces in the S-shaped metal-binding loop and beta-strands III and V that together form a pocket on the remote side of the zinc binding site. The patterns of protection suggest bending of the triple helical peptide partly around the catalytic domain to reach novel exosites. Partial unwinding or underwinding of the triple helix could accompany this to facilitate its hydrolysis.
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16
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Freije R, Klein T, Ooms B, Kauffman HF, Bischoff R. An integrated high-performance liquid chromatography-mass spectrometry system for the activity-dependent analysis of matrix metalloproteases. J Chromatogr A 2007; 1189:417-25. [PMID: 18001757 DOI: 10.1016/j.chroma.2007.10.059] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2007] [Revised: 10/17/2007] [Accepted: 10/23/2007] [Indexed: 11/25/2022]
Abstract
Matrix metalloproteases (MMPs) comprise a family of enzymes that play important roles in mediating angiogenesis, the remodelling of tissues and in cancer metastasis. Consequently, they are attractive targets for therapeutic intervention in chronic inflammation, cancer and neurological disorders. In order to study MMPs in body fluids in an activity-dependent manner, we have developed an automated, integrated system comprising an immobilized inhibitor cartridge for activity-dependent enrichment, an immobilized trypsin reactor for rapid on-line proteolysis and a capillary or nanoLC-MS system for separation and identification of the obtained peptide fragments. This targeted proteomics system was optimized with respect to recovery and evaluated through the analysis of urine samples that were spiked with recombinant MMP-12. MMP-12 specific peptide fragments were easily detected in a nanoLC-MS analysis of 500 microL crude urine spiked at a level of 8 nM. These results show the feasibility of selective, activity-dependent enrichment of MMPs from a non-treated biofluid at low nM concentrations.
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Affiliation(s)
- Robert Freije
- Analytical Biochemistry, Center for Pharmacy, University of Groningen, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
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17
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Bhaskaran R, Palmier MO, Bagegni NA, Liang X, Van Doren SR. Solution structure of inhibitor-free human metalloelastase (MMP-12) indicates an internal conformational adjustment. J Mol Biol 2007; 374:1333-44. [PMID: 17997411 DOI: 10.1016/j.jmb.2007.10.028] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2007] [Revised: 09/30/2007] [Accepted: 10/08/2007] [Indexed: 10/22/2022]
Abstract
Macrophage metalloelastase or matrix metalloproteinase-12 (MMP-12) appears to exacerbate atherosclerosis, emphysema, aortic aneurysm, rheumatoid arthritis, and inflammatory bowel disease. An inactivating E219A mutation, validated by crystallography and NMR spectra, prevents autolysis of MMP-12 and allows us to determine its NMR structure without an inhibitor. The structural ensemble of the catalytic domain without an inhibitor is based on 2813 nuclear Overhauser effects (NOEs) and has an average RMSD to the mean structure of 0.25 A for the backbone and 0.61 A for all heavy atoms for residues Trp109-Gly263. Compared to crystal structures of MMP-12, helix B (hB) at the active site is unexpectedly more deeply recessed under the beta-sheet. This opens a pocket between hB and beta-strand IV in the active-site cleft. Both hB and an internal cavity are shifted toward beta-strand I, beta-strand III, and helix A on the back side of the protease. About 25 internal NOE contacts distinguish the inhibitor-free solution structure and indicate hB's greater depth and proximity to the sheet and helix A. Line broadening and multiplicity of amide proton NMR peaks from hB are consistent with hB undergoing a slow conformational exchange among subtly different environments. Inhibitor-binding-induced perturbations of the NMR spectra of MMP-1 and MMP-3 map to similar locations across MMP-12 and encompass the internal conformational adjustments. Evolutionary trace analysis suggests a functionally important network of residues that encompasses most of the locations adjusting in conformation, including 18 residues with NOE contacts unique to inhibitor-free MMP-12. The conformational change, sequence analysis, and inhibitor perturbations of NMR spectra agree on the network they identify between structural scaffold and the active site of MMPs.
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Affiliation(s)
- Rajagopalan Bhaskaran
- Department of Biochemistry, 117 Schweitzer Hall, University of Missouri, Columbia, MO 65211, USA
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18
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Zheng X, Ou L, Tong X, Zhu J, Wu H. Over-expression and refolding of isotopically labeled recombinant catalytic domain of human macrophage elastase (MMP-12) for NMR studies. Protein Expr Purif 2007; 56:160-6. [PMID: 17601747 DOI: 10.1016/j.pep.2007.05.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2007] [Revised: 05/11/2007] [Accepted: 05/16/2007] [Indexed: 11/22/2022]
Abstract
Human macrophage elastase (MMP-12) plays an important role in inflammatory processes and is involved in a number of physiological or pathological situations, such as conversion of plasminogen into angiostatin, allergic airway inflammation, vascular remodeling or alteration, as well as emphysema, and has been justified as a novel drug target. Here, we report the over-expression in Escherichia coil, purification and refolding of MMP-12 catalytic domain for NMR studies. The primary sequence of expressed protein was identified by means of MALDI-TOF MS, and was confirmed by the MALDI-TOF MS data of trypsin-digested peptides. A significantly optimized protocol has been worked out to prepare 15N and/or 13C-labeled MMP-12 catalytic domain, and the yield of the purified protein is estimated to 10-12 mg from 0.5L of M9 minimal media. Finally, the 15N-1H HSQC spectrum of uniformly 15N-labeled MMP-12 catalytic domain indicates the presence of well-ordered and properly folded protein in a monomeric form.
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Affiliation(s)
- Xunhai Zheng
- State Key Laboratory of Bio-organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Science, Shanghai 200032, PR China
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19
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Thomas DA, Francis P, Smith C, Ratcliffe S, Ede NJ, Kay C, Wayne G, Martin SL, Moore K, Amour A, Hooper NM. A broad-spectrum fluorescence-based peptide library for the rapid identification of protease substrates. Proteomics 2006; 6:2112-20. [PMID: 16479534 DOI: 10.1002/pmic.200500153] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Identification of peptide substrates for proteases can be a major undertaking. To overcome issues such as feasibility and deconvolution, associated with large peptide libraries, a 'small but smart' generic fluorescence resonance energy transfer rapid endopeptidase profiling library (REPLi) was synthesised as a tool for rapidly identifying protease substrates. Within a tripeptide core, flanked by Gly residues, similar amino acids were paired giving rise to a relatively small library of 3375 peptides divided into 512 distinct pools each containing only 8 peptides. The REPLi was validated with trypsin, pepsin, the matrix metalloprotease (MMP)-12 and MMP-13 and calpains-1 and -2. In the case of calpain-2, a single iteration step involving LC-MS, provided the definitive residue specificity from which a highly sensitive fluorogenic substrate, (FAM)-Gly-Gly-Gly-Gln-Leu-Tyr-Gly-Gly-DPA-Arg-Arg-Lys-(TAMRA), was then designed. The thorough validation of this 'small but smart' peptide library with representatives from each of the four mechanistic protease classes indicates that the REPLi will be useful for the rapid identification of substrates for multiple proteases.
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Affiliation(s)
- Daniel A Thomas
- Proteolysis Research Group, School of Biochemistry and Microbiology, Leeds Institute of Genetics, Health and Therapeutics, University of Leeds, Leeds, UK
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20
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Nénan S, Planquois JM, Berna P, De Mendez I, Hitier S, Shapiro SD, Boichot E, Lagente V, Bertrand CP. Analysis of the inflammatory response induced by rhMMP-12 catalytic domain instilled in mouse airways. Int Immunopharmacol 2005; 5:511-24. [PMID: 15683848 DOI: 10.1016/j.intimp.2004.10.011] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2004] [Revised: 10/01/2004] [Accepted: 10/25/2004] [Indexed: 11/29/2022]
Abstract
Macrophage elastase (MMP-12) is a metalloproteinase able to degrade extracellular matrix components such as elastin. As many MMPs, MMP-12 is involved in acute and chronic lung injury. However, its role in the inflammatory process of the lung parenchyma is not clearly understood. In this study, we have investigated the effects of airway instillation of rhMMP-12 on inflammatory cell recruitment, cytokine release and gelatinase expression in bronchoalveolar lavage fluid (BALF) or in lung homogenate supernatants in mice. Numbers of total and individual cell types were examined in BALF during the first 72 h following rhMMP-12 instillation. A marked recruitment of neutrophils was observed with a maximum increase at 18 h. This cellular recruitment was associated with a very transient increase in IL-6, TNF-alpha MIP-1alpha, MCP-1 and KC levels and gelatinase expression in BALF and in lung homogenate supernatants. From days 4 to 15, performing the same analyses, we observed an important and stable recruitment of macrophages in BALF in absence of the other studied inflammatory markers. These results demonstrate that rhMMP-12 itself is able to induce an early inflammatory response characterized by neutrophil infiltration, cytokine release and gelatinase activation followed by a later response composed mainly of macrophage recruitment.
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Affiliation(s)
- Soazig Nénan
- Pfizer Global R&D, Fresnes Laboratories, Fresnes, France
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21
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Morales R, Perrier S, Florent JM, Beltra J, Dufour S, De Mendez I, Manceau P, Tertre A, Moreau F, Compere D, Dublanchet AC, O'Gara M. Crystal structures of novel non-peptidic, non-zinc chelating inhibitors bound to MMP-12. J Mol Biol 2004; 341:1063-76. [PMID: 15289103 DOI: 10.1016/j.jmb.2004.06.039] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2003] [Revised: 05/14/2004] [Accepted: 06/16/2004] [Indexed: 11/28/2022]
Abstract
Human macrophage elastase (MMP-12) plays an important role in inflammatory processes and has been implicated in diseases such as emphysema and chronic obstructive pulmonary disease (COPD). It is therefore an attractive target for therapeutic agents. As part of a structure-based drug design programme to find new inhibitors of MMP-12, the crystal structures of the MMP-12 catalytic domain (residues 106-268) complexed to three different non-peptidic small molecule inhibitors have been determined. The structures reveal that all three ligands bind in the S1' pocket but show varying degrees of interaction with the Zn atom. The structures of the complexes with inhibitors CP-271485 and PF-00356231 reveal that their central morpholinone and thiophene rings, respectively, sit over the Zn atom at a distance of approximately 5A, locating the inhibitors halfway down the S1' pocket. In both of these structures, an acetohydroxamate anion, an artefact of the crystallisation solution, chelates the zinc atom. By contrast, the acetohydroxamate anion is displaced by the ligand in the structure of MMP-12 complexed to PD-0359601 (Bayer), a potent zinc chelating N-substituted biaryl butyric acid, used as a reference compound for crystallisation. Although a racemate was used for the crystallisation, the S enantiomer only is bound in the crystal. Important hydrophobic interactions between the inhibitors and residues from the S1' pocket are observed in all of the structures. The relative selectivity displayed by these ligands for MMP-12 over other MMP family members is discussed.
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Affiliation(s)
- Renaud Morales
- Pfizer Global Research and Development, Fresnes Laboratories, 94265 Fresnes Cedex, France [corrected]
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22
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Yasuda Y, Li Z, Greenbaum D, Bogyo M, Weber E, Brömme D. Cathepsin V, a novel and potent elastolytic activity expressed in activated macrophages. J Biol Chem 2004; 279:36761-70. [PMID: 15192101 DOI: 10.1074/jbc.m403986200] [Citation(s) in RCA: 139] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Atherosclerosis is characterized by a thickening and loss of elasticity of the arterial wall. Loss of elasticity has been attributed to the degradation of the arterial elastin matrix. Cathepsins K and S are papain-like cysteine proteases with known elastolytic activities, and both enzymes have been identified in macrophages present in plaque areas of diseased blood vessels. Here we demonstrate that macrophages express a third elastolytic cysteine protease, cathepsin V, which exhibits the most potent elastase activity yet described among human proteases and that cathepsin V is present in atherosclerotic plaque specimens. Approximately 60% of the total elastolytic activity of macrophages can be attributed to cysteine proteases with cathepsins V, K, and S contributing equally. From this 60%, two-thirds occur extracellularly and one-third intracellularly with the latter credited to cathepsin V. Ubiquitously expressed glycosaminoglycans (GAGs) such as chondroitin sulfate specifically inhibit the elastolytic activities of cathepsins V and K via the formation of specific cathepsin-GAG complexes. In contrast, cathepsin S, which does not form complexes with chondroitin sulfate is not inhibited; thus suggesting a specific regulation of elastolytic activities of cathepsins by GAGs. Because the GAG content is reduced in atherosclerotic plaques, an increase of cathepsins V and K activities may accelerate the destruction of the elastin matrix in diseased arteries.
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Affiliation(s)
- Yoshiyuki Yasuda
- Department of Human Genetics, Mount Sinai School of Medicine, 5th Avenue, 100th Street, New York, NY 10029, USA
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23
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Freije JR, Bischoff R. Activity-based enrichment of matrix metalloproteinases using reversible inhibitors as affinity ligands. J Chromatogr A 2003; 1009:155-69. [PMID: 13677656 DOI: 10.1016/s0021-9673(03)00920-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Matrix metalloproteinases (MMPs) are zinc dependent metalloproteases characterized by the ability to cleave extracellular matrix and many other extracellular proteins. MMP activity is tightly regulated but disturbances in this regulation can contribute to various disease processes characterized by a progressive destruction of the extracellular matrix. The ability to profile classes of enzymes based on functionally related activities would greatly facilitate research about the involvement of MMPs in physiological and/or pathological states. Here we describe the characterization of an affinity sorbent using an immobilized reversible inhibitor as a stationary phase for the activity-based enrichment of MMPs from biological samples. With a ligand density of 9.8 mM and binding constant of 58 micromol/l towards MMP-12, the capturing power of the affinity sorbent was strong enough to extract MMP-12 spiked into serum with high selectivity from relatively large sample volumes. Experiments with endogenous inhibitors revealed that MMP-12 extraction is strictly activity-dependent, offering powerful means to monitor MMP activities in relation to physiological and/or pathological events by using affinity extraction as a first step in an MMP profiling method.
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Affiliation(s)
- J R Freije
- University Center for Pharmacy, University of Groningen, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
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24
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Abstract
Bacterial inclusion bodies (IBs) are refractile aggregates of protease-resistant misfolded protein that often occur in recombinant bacteria upon gratuitous overexpression of cloned genes. In biotechnology, the formation of IBs represents a main obstacle for protein production since even favouring high protein yields, the in vitro recovery of functional protein from insoluble deposits depends on technically diverse and often complex re-folding procedures. On the other hand, IBs represent an exciting model to approach the in vivo analysis of protein folding and to explore aggregation dynamics. Recent findings on the molecular organisation of embodied polypeptides and on the kinetics of inclusion body formation have revealed an unexpected dynamism of these protein aggregates, from which polypeptides are steadily released in living cells to be further refolded or degraded. The close connection between in vivo protein folding, aggregation, solubilisation and proteolytic digestion offers an integrated view of the bacterial protein quality control system of which IBs might be an important component especially in recombinant bacteria.
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Affiliation(s)
- M M Carrió
- Institut de Biotecnologia i de Biomedicina and Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, Bellaterra, 08193, Barcelona, Spain
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