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Leulmi I, Zidoune MN, Hafid K, Djeghim F, Bourekoua H, Dziki D, Różyło R. New Coagulant Proteases for Cheesemaking from Leaves and Latex of the Spontaneous Plant Pergularia tomentosa: Biochemical Characterization of Coagulants and Sensorial Evaluation of Cheese. Foods 2023; 12:2467. [PMID: 37444205 DOI: 10.3390/foods12132467] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2023] [Revised: 06/06/2023] [Accepted: 06/20/2023] [Indexed: 07/15/2023] Open
Abstract
The purpose of this study was to evaluate the caseinolytic and milk-clotting activities of aqueous crude extracts from leaves and latex of the Pergularia tomentosa, to determine their suitability as a rennet substitute. These extracts were subjected to a series of biochemical tests before being used in the production of cheese. The results showed that the enzymatic latex extract had a higher coagulant activity than the leaf extract. However, under different clotting conditions (pH, temperature, and CaCl2 concentration), both coagulants behaved similarly in the coagulation of Berridge substrate. The SDS-PAGE and zymographic analysis revealed identical protein bands with a single active zone in both extracts, corresponding to a molecular weight of 26.98 kDa and 26.03 kDa in the extract of leaf and latex, respectively. Both extracts were stable to different effectors but strongly inhibited by iodoacetamide and Hg, suggesting it to be a cysteine protease. Both extracts were able to hydrolyze casein and generate peptides of 14 kDa, with excessive hydrolysis of the other casein fractions. The physicochemical parameters of cheese made from latex and leaf extract evolved similarly to control cheese. According to the sensory evaluation, cheese made with latex had a mildly bitter flavor but showed a high acceptance rate (>80%).
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Affiliation(s)
- Imene Leulmi
- Equipe de Transformation et d'Elaboration des Produits Agro-Alimentaires, Laboratoire de Nutrition et de Technologie Alimentaire, Institut de la Nutrition, de l'Alimentation et des Technologies Agro-Alimentaires, Université des Frères Mentouri-Constantine 1, Route de Ain El-Bey, Constantine 25000, Algeria
| | - Mohammed Nasreddine Zidoune
- Equipe de Transformation et d'Elaboration des Produits Agro-Alimentaires, Laboratoire de Nutrition et de Technologie Alimentaire, Institut de la Nutrition, de l'Alimentation et des Technologies Agro-Alimentaires, Université des Frères Mentouri-Constantine 1, Route de Ain El-Bey, Constantine 25000, Algeria
| | - Kahina Hafid
- Equipe Maquav, Laboratoire de Recherche Biotechnologie et Qualité des Aliments, Institut de la Nutrition, de l'Alimentation et des Technologies Agro-Alimentaires, Université Frères Mentouri-Constantine 1, Route de Ain El-Bey, Constantine 25000, Algeria
| | - Fairouz Djeghim
- Equipe de Transformation et d'Elaboration des Produits Agro-Alimentaires, Laboratoire de Nutrition et de Technologie Alimentaire, Institut de la Nutrition, de l'Alimentation et des Technologies Agro-Alimentaires, Université des Frères Mentouri-Constantine 1, Route de Ain El-Bey, Constantine 25000, Algeria
| | - Hayat Bourekoua
- Equipe de Transformation et d'Elaboration des Produits Agro-Alimentaires, Laboratoire de Nutrition et de Technologie Alimentaire, Institut de la Nutrition, de l'Alimentation et des Technologies Agro-Alimentaires, Université des Frères Mentouri-Constantine 1, Route de Ain El-Bey, Constantine 25000, Algeria
| | - Dariusz Dziki
- Department of Thermal Technology and Food Process Engineering, University of Life Sciences in Lublin, 31 Głęboka Street, 20-612 Lublin, Poland
| | - Renata Różyło
- Department of Food Engineering and Machines, University of Life Sciences in Lublin, Głęboka 28, 20-612 Lublin, Poland
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Errasti ME, Torres MJ, Mercerat JR, Caffini NO, López LMI. Plant proteases from Carica papaya and Vasconcellea quercifolia with potential application for a cleaner processing in tanneries. BIOCATAL BIOTRANSFOR 2020. [DOI: 10.1080/10242422.2020.1751131] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- María Eugenia Errasti
- Centro de Investigación de Tecnología del Cuero, CICPBA-INTI, Manuel B. Gonnet, Argentina
- Centro de Investigación de Proteínas Vegetales, Facultad de Ciencias Exactas, Departamento de Ciencias Biológicas, Universidad Nacional de La Plata-CICPBA, La Plata, Argentina
| | - María José Torres
- Centro de Investigaciones y Transferencia del Noroeste de la Provincia de Buenos Aires, UNNOBA-CONICET, Junín, Argentina
| | - Julio Ricardo Mercerat
- Centro de Investigación de Proteínas Vegetales, Facultad de Ciencias Exactas, Departamento de Ciencias Biológicas, Universidad Nacional de La Plata-CICPBA, La Plata, Argentina
| | - Néstor Oscar Caffini
- Centro de Investigación de Proteínas Vegetales, Facultad de Ciencias Exactas, Departamento de Ciencias Biológicas, Universidad Nacional de La Plata-CICPBA, La Plata, Argentina
| | - Laura María Isabel López
- Centro de Investigación de Tecnología del Cuero, CICPBA-INTI, Manuel B. Gonnet, Argentina
- Universidad Nacional Arturo Jauretche, Florencio Varela, Argentina
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One-step recovery of latex papain from Carica papaya using three phase partitioning and its use as milk-clotting and meat-tenderizing agent. Int J Biol Macromol 2019; 146:798-810. [PMID: 31726142 DOI: 10.1016/j.ijbiomac.2019.10.048] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 10/02/2019] [Accepted: 10/04/2019] [Indexed: 01/29/2023]
Abstract
Three Phase Partitioning (TPP) system as an elegant non-chromatographic and bulk separation method was successfully applied for the extraction and recovery of papain from the latex of Carica papaya. The optimized parameters of TPP allowed achieving a purification fold of 11.45 and activity recovery of 134% with 40% (NH4)2SO4, 1.0:0.75 ratio of crude extract: t-BuOH at pH and temperature of 6.0 and 25 °C, respectively. The recovered papain had a molecular weight of 23.2 kDa and revealed maximum activity at pH 6.0 and temperature of 50 °C. The maximum values of Km and Vmax parameters were 10.83 mg mL-1 and 33.33 U mL-1, respectively. The protease with 4 isoforms was stable at 40-80 °C and a pH range of 6.0-7.5 against numerous metal ions and none of them inactivated the recovered protease. Moreover, 10 mM Ca2+ improved 2-folds the activity and half-life of the protease at temperatures from 30 to 50 °C. The milk-clotting activity tests revealed high stability of latex papain at storage, namely at -20 °C compared to 4 °C and 25 °C for up than 5 weeks. As a meat tenderizing agent, it showed promising role under different treatments by improving the texture of tough meat. The findings indicated that one-step TPP system is a simple, quick, economical and very attractive process for fast recovery of latex papain compared to other proposed protocols.
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Muthu S, Gopal VB, Karthik S. N, Sivaji P, Malairaj S, Lakshmikanthan M, Subramani N, Perumal P. Antibacterial cysteine protease from Cissus quadrangularis L. Int J Biol Macromol 2017; 103:878-888. [DOI: 10.1016/j.ijbiomac.2017.05.107] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2017] [Revised: 05/15/2017] [Accepted: 05/17/2017] [Indexed: 10/19/2022]
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Sequeiros C, Torres MJ, Nievas ML, Caffini NO, Natalucci CL, López LMI, Trejo SA. The Proteolytic Activity of Philibertia gilliesii Latex. Purification of Philibertain g II. Appl Biochem Biotechnol 2016; 179:332-46. [DOI: 10.1007/s12010-016-1997-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Accepted: 01/22/2016] [Indexed: 11/30/2022]
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Characterization of thermo- and detergent stable antigenic glycosylated cysteine protease of Euphorbia nivulia Buch.-Ham. and evaluation of its ecofriendly applications. ScientificWorldJournal 2013; 2013:716545. [PMID: 24348183 PMCID: PMC3855982 DOI: 10.1155/2013/716545] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Accepted: 09/09/2013] [Indexed: 11/18/2022] Open
Abstract
An antigenic glycosylated cysteine protease has been purified from the latex of Euphorbia nivulia Buch.-Ham. It exhibits remarkable protease activity in the presence of metal ions, oxidizing agents, organic solvents, and detergents. This enzyme showed potential role in leather processing industry due to its dehairing activity for animal hide without hydrolyzing fibrous proteins, producing, by this way, a better quality product. The enzyme can also be used for silver recovering from X-ray plates. In addition, the stability (temperature and surfactants) and hydrolysis of blood stain data also revealed its application in detergent industries. Agriculturally, this protease finds application in biocontrol process against the infectious management of root knot nematode, Meloidogyne incognita. Biologically, it shows noticeable wound healing, haemostatic and antibacterial activity.
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Torres MJ, Trejo SA, Natalucci CL, López LMI. Biochemical characterization of VQ-VII, a cysteine peptidase with broad specificity, isolated from Vasconcellea quercifolia latex. PLANTA 2013; 237:1651-1659. [PMID: 23568402 DOI: 10.1007/s00425-013-1872-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2012] [Accepted: 03/08/2013] [Indexed: 06/02/2023]
Abstract
The latex from Vasconcellea quercifolia ("oak leaved papaya"), a member of the Caricaceae family, contains at least seven cysteine endopeptidases with high proteolytic activity, which helps to protect these plants against injury. In this study, we isolated and characterized the most basic of these cysteine endopeptidases, named VQ-VII. This new purified enzyme was homogeneous by bidimensional electrophoresis and MALDI-TOF mass spectrometry, and exhibited a molecular mass of 23,984 Da and an isoelectric point >11. The enzymatic activity of VQ-VII was completely inhibited by E-64 and iodoacetic acid, confirming that it belongs to the catalytic group of cysteine endopeptidases. By investigating the cleavage of the oxidized insulin B-chain to establish the hydrolytic specificity of VQ-VII, we found 13 cleavage sites on the substrate, revealing that it is a broad-specificity peptidase. The pH profiles toward p-Glu-Phe-Leu-p-nitroanilide (PFLNA) and casein showed that the optimum pH is about 6.8 for both substrates, and that in casein, it is active over a wide pH range (activity higher than 80 % between pH 6 and 9.5). Kinetic enzymatic assays were performed with the thiol peptidase substrate PFLNA (K m = 0.454 ± 0.046 mM, k cat = 1.57 ± 0.07 s(-1), k cat/K m = 3.46 × 10(3) ± 14 s(-1) M(-1)). The N-terminal sequence (21 amino acids) of VQ-VII showed an identity >70 % with 11 plant cysteine peptidases and the presence of highly conserved residues and motifs shared with the "papain-like" family of peptidases. VQ-VII proved to be a new latex enzyme of broad specificity, which can degrade extensively proteins of different nature in a wide pH range.
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Affiliation(s)
- María José Torres
- Departamento de Ciencias Básicas y Experimentales, Universidad Nacional del Noroeste de Provincia de Buenos Aires, Junín, Argentina
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Peptide Mass Fingerprinting and N-Terminal Amino Acid Sequencing of Glycosylated Cysteine Protease of Euphorbia nivulia Buch.-Ham. JOURNAL OF AMINO ACIDS 2013; 2013:569527. [PMID: 23476742 PMCID: PMC3588393 DOI: 10.1155/2013/569527] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/24/2012] [Revised: 12/30/2012] [Accepted: 12/30/2012] [Indexed: 11/30/2022]
Abstract
A new cysteine protease named Nivulian-II has been purified from the latex of Euphorbia nivulia Buch.-Ham. The apparent molecular mass of Nivulian-II is 43670.846 Da (MALDI TOF/MS). Peptide mass fingerprint analysis revealed peptide matches to Maturase K (Q52ZV1_9MAGN) of Banksia quercifolia. The N-terminal sequence (DFPPNTCCCICC) showed partial homology with those of other cysteine proteinases of biological origin. This is the first paper to characterize a Nivulian-II of E. nivulia latex with respect to amino acid sequencing.
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Torres MJ, Trejo SA, Obregón WD, Avilés FX, López LMI, Natalucci CL. Characterization of the proteolytic system present in Vasconcellea quercifolia latex. PLANTA 2012; 236:1471-1484. [PMID: 22790602 DOI: 10.1007/s00425-012-1701-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Accepted: 06/20/2012] [Indexed: 06/01/2023]
Abstract
Vasconcellea quercifolia (Caricaceae) latex contains several cysteine endopeptidases with high proteolytic activity. Cysteine endopeptidases are the main active compounds used by the plant as a defense mechanism. A proteolytic preparation from V. quercifolia ("oak leaved papaya") latex was purified by cation exchange chromatography. From SDS-PAGE and blotting of the selected fractions, the N-terminal amino acid sequences of polypeptides were determined by Edman's degradation. The analysis by peptide mass fingerprinting (PMF) of the enzymes allowed their characterization and confirmed the presence of seven different cysteine proteinases in the latex of V. quercifolia. Moreover, the comparison between the tryptic maps with those deposited in databases using the MASCOT tool showed that none of the isolated proteases matched with another plant protease. Notably, a propeptidase was detected in the plant latex, which is being the first report in this sense. Furthermore, the cDNA of one of the cysteine proteases that is expressed in the latex of V. quercifolia was cloned and sequenced. The consensus sequence was aligned using the ClustalX web server, which allowed detecting a high degree of identity with cysteine proteases of the Caricaceae family and establishing the evolutionary relationship between them. We also observed a high conservation degree for those amino acid residues which are essential for the catalytic activity and tridimensional structure of the plant proteases belonging to the subfamily C1A. The PMF analysis strongly suggests that the sequence obtained corresponds to the VQ-III peptidase.
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Affiliation(s)
- María José Torres
- Laboratorio de Investigación de Proteínas Vegetales, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, C.C. 711, B1900AVW, La Plata, Argentina
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González-Rábade N, Badillo-Corona JA, Aranda-Barradas JS, Oliver-Salvador MDC. Production of plant proteases in vivo and in vitro--a review. Biotechnol Adv 2011; 29:983-96. [PMID: 21889977 DOI: 10.1016/j.biotechadv.2011.08.017] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2011] [Revised: 08/10/2011] [Accepted: 08/19/2011] [Indexed: 12/30/2022]
Abstract
In the latest two decades, the interest received by plant proteases has increased significantly. Plant enzymes such as proteases are widely used in medicine and the food industry. Some proteases, like papain, bromelain and ficin are used in various processes such as brewing, meat softening, milk-clotting, cancer treatment, digestion and viral disorders. These enzymes can be obtained from their natural source or through in vitro cultures, in order to ensure a continuous source of plant enzymes. The focus of this review will be the production of plant proteases both in vivo and in vitro, with particular emphasis on the different types of commercially important plant proteases that have been isolated and characterized from naturally grown plants. In vitro approaches for the production of these proteases is also explored, focusing on the techniques that do not involve genetic transformation of the plants and the attempts that have been made in order to enhance the yield of the desired proteases.
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Obregón WD, Lufrano D, Liggieri CS, Trejo SA, Vairo-Cavalli SE, Avilés FX, Priolo NS. Biochemical characterization, cDNA cloning, and molecular modeling of araujiain aII, a papain-like cysteine protease from Araujia angustifolia latex. PLANTA 2011; 234:293-304. [PMID: 21424535 DOI: 10.1007/s00425-011-1399-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2010] [Accepted: 03/06/2011] [Indexed: 05/30/2023]
Abstract
Araujiain aII, the protease with highest specific activity purified from latex of Araujia angustifolia (Apocynaceae), shows optimum proteolytic activity at alkaline pH, and it is completely inhibited by the irreversible inhibitor of cysteine proteases trans-epoxysucciny-L: -leucyl-amido(4-guanidino) butane. It exhibits esterolytic activity on several N-α-Cbz-amino acid p-nitrophenyl esters with a preference for Gln, Ala, and Gly derivatives. Kinetic enzymatic assays were performed with the thiol proteinase substrate p-Glu-Phe-Leu-p-nitroanilide (K (m) = 0.18 ± 0.03 mM, k (cat) = 1.078 ± 0.055 s(-1), k (cat)/K (m) = 5.99 ± 0.57 s(-1) mM(-l)). The enzyme has a pI value above 9.3 and a molecular mass of 23.528 kDa determined by mass spectrometry. cDNA of the peptidase was obtained by reverse transcription-PCR starting from total RNA isolated from latex. The deduced amino acid sequence was confirmed by peptide mass fingerprinting analysis. The N-terminus of the mature protein was determined by automated sequencing using Edman's degradation and compared with the sequence deduced from cDNA. The full araujiain aII sequence was thus obtained with a total of 213 amino acid residues. The peptidase, as well as other Apocynaceae latex peptidases, is a member of the subfamily C1A of cysteine proteases. The enzyme belongs to the alpha + beta class of proteins, with two disulfide bridges (Cys22-Cys63 and Cys56-Cys95) in the alpha domain, and another one (Cys150-Cys201) in the beta domain, as was suggested by molecular modeling.
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Affiliation(s)
- Walter D Obregón
- Laboratorio de Investigación de Proteínas Vegetales, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, 47 y 115 s/N, C.C. 711, B1900AVW, La Plata, Argentina
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Singh AN, Dubey VK. Exploring applications of procerain b, a novel protease from Calotropis procera, and characterization by N-terminal sequencing as well as peptide mass fingerprinting. Appl Biochem Biotechnol 2011; 164:573-80. [PMID: 21264687 DOI: 10.1007/s12010-011-9158-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2010] [Accepted: 01/03/2011] [Indexed: 11/26/2022]
Abstract
Procerain B is a novel cysteine protease isolated from Calotropis procera by our group and published recently. We have further characterized the enzyme by N-terminal sequencing and peptide mass fingerprinting. Procerain B showed maximum sequence similarity (80%) with Asclepain. Moreover, the characteristic VDWR motif of cysteine proteases is present in procerain B. The N-terminal and peptide mass fingerprinting analysis showed a distinct nature of the enzyme. Various applications of the enzyme were also evaluated. Procerain B is very effective in milk-clotting and may be a potential candidate for this process in the cheese industry. Additionally, the enzyme has potential application as dietary supplement to aid digestion. Effects of various metal ions on milk-clotting activity were also studied. The milk-clotting activity was increased in case of few metals while others have a negative effect. It is worth mentioning that the easy availability of plant material and simple purification method makes industrial production of the enzyme feasible. A protease with easy purification and suitable properties for application is always desired.
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Affiliation(s)
- Abhay Narayan Singh
- Department of Biotechnology, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India
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Pardo M, Bruno M, Sequeiros C, Trejo S, López L, Caffini N, Natalucci C. New plant endopeptidases with potential application in cheesemaking. ACTA ALIMENTARIA 2010. [DOI: 10.1556/aalim.39.2010.2.12] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Obregón WD, Liggieri CS, Trejo SA, Avilés FX, Vairo-Cavalli SE, Priolo NS. Characterization of papain-like isoenzymes from latex of Asclepias curassavica by molecular biology validated by proteomic approach. Biochimie 2009; 91:1457-64. [PMID: 19679160 DOI: 10.1016/j.biochi.2009.07.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2009] [Accepted: 07/31/2009] [Indexed: 11/27/2022]
Abstract
Latices from Asclepias spp are used in wound healing and the treatment of some digestive disorders. These pharmacological actions have been attributed to the presence of cysteine proteases in these milky latices. Asclepias curassavica (Asclepiadaceae), "scarlet milkweed" is a perennial subshrub native to South America. In the current paper we report a new approach directed at the selective biochemical and molecular characterization of asclepain cI (acI) and asclepain cII (acII), the enzymes responsible for the proteolytic activity of the scarlet milkweed latex. SDS-PAGE spots of both purified peptidases were digested with trypsin and Peptide Mass Fingerprints (PMFs) obtained showed no equivalent peptides. No identification was possible by MASCOT search due to the paucity of information concerning Asclepiadaceae latex cysteine proteinases available in databases. From total RNA extracted from latex samples, cDNA of both peptidases was obtained by RT-PCR using degenerate primers encoding Asclepiadaceae cysteine peptidase conserved domains. Theoretical PMFs of partial polypeptide sequences obtained by cloning (186 and 185 amino acids) were compared with empirical PMFs, confirming that the sequences of 186 and 185 amino acids correspond to acI and acII, respectively. N-terminal sequences of acI and acII, characterized by Edman sequencing, were overlapped with those coming from the cDNA to obtain the full-length sequence of both mature peptidases (212 and 211 residues respectively). Alignment and phylogenetic analysis confirmed that acI and acII belong to the subfamily C1A forming a new group of papain-like cysteine peptidases together with asclepain f from Asclepias fruticosa. We conclude that PMF could be adopted as an excellent tool to differentiate, in a fast and unequivocal way, peptidases with very similar physicochemical and functional properties, with advantages over other conventional methods (for instance enzyme kinetics) that are time consuming and afford less reliable results.
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Affiliation(s)
- Walter D Obregón
- Laboratorio de Investigación de Proteínas Vegetales, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, La Plata, Argentina
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Granulosain I, a cysteine protease isolated from ripe fruits of Solanum granuloso-leprosum (Solanaceae). Protein J 2009; 27:267-75. [PMID: 18478320 DOI: 10.1007/s10930-008-9133-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
A new cysteine peptidase (Granulosain I) was isolated from ripe fruits of Solanum granuloso-leprosum Dunal (Solanaceae) by means of precipitation with organic solvent and cation exchange chromatography. The enzyme showed a single band by SDS-PAGE, its molecular mass was 24,746 Da (MALDI-TOF/MS) and its isoelectric point was higher than 9.3. It showed maximum activity (more than 90%) in the pH range 7-8.6. Granulosain I was completely inhibited by E-64 and activated by the addition of cysteine or 2-mercaptoethanol, confirming its cysteinic nature. The kinetic studies carried out with PFLNA as substrate, showed an affinity (Km 0.6 mM) slightly lower than those of other known plant cysteine proteases (papain and bromelain). The N-terminal sequence of granulosain I (DRLPASVDWRGKGVLVLVKNQGQC) exhibited a close homology with other cysteine proteases belonging to the C1A family.
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