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Ancona N, Bastola A, Alexov E. PKAD-2: New entries and expansion of functionalities of the database of experimentally measured pKa's of proteins. JOURNAL OF COMPUTATIONAL BIOPHYSICS AND CHEMISTRY 2023; 22:515-524. [PMID: 37520074 PMCID: PMC10373500 DOI: 10.1142/s2737416523500230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/01/2023]
Abstract
Almost all biological reactions are pH dependent and understanding the origin of pH dependence requires knowledge of the pKa's of ionizable groups. Here we report a new edition of PKAD, the PKAD-2, which is a database of experimentally measured pKa's of proteins, both wild type and mutant proteins. The new additions include 117 wild type and 54 mutant pKa values, resulting in total 1742 experimentally measured pKa's. The new edition of PKAD-2 includes 8 new wild type and 12 new mutant proteins, resulting in total of 220 proteins. This new edition incorporates a visual 3D image of the highlighted residue of interest within the corresponding protein or protein complex. Hydrogen bonds were identified, counted, and implemented as a search feature. Other new search features include the number of neighboring residues <4A from the heaviest atom of the side chain of a given amino acid. Here, we present PKAD-2 with the intention to continuously incorporate novel features and current data with the goal to be used as benchmark for computational methods.
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Affiliation(s)
- Nicolas Ancona
- Department of Biological Sciences, College of Science, Clemson University, 105 Sikes Hall, Address, Clemson, SC 29634, United States of America
| | - Ananta Bastola
- School of Computing, College of Engineering, Computing and Applied Sciences, Clemson University, 105 Sikes Hall, SC 29634, United States of America
| | - Emil Alexov
- Department of Physics, College of Science, Clemson University, 105 Sikes Hall, Address, Clemson, SC 29634, United States of America
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2
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Mandal R, Ghosh A, Rout NK, Prasad M, Hazra B, Sar S, Das S, Datta A, Tarafdar PK. Self-assembled prebiotic amphiphile-mixture exhibits tunable catalytic properties. Org Biomol Chem 2023; 21:4473-4481. [PMID: 37194351 DOI: 10.1039/d3ob00606a] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Protocellular surface formation via the self-assembly of amphiphiles, and catalysis by simple peptides/proto-RNA are two important pillars in the evolution of protocells. To hunt for prebiotic self-assembly-supported catalytic reactions, we thought that amino-acid-based amphiphiles might play an important role. In this paper, we investigate the formation of histidine-based and serine-based amphiphiles under mild prebiotic conditions from amino acid : fatty alcohol and amino acid : fatty acid mixtures. The histidine-based amphiphiles were able to catalyze hydrolytic reactions at the self-assembled surface (with a rate increase of ∼1000-fold), and the catalytic ability can be tuned by linkage of the fatty carbon part to histidine (N-acylated vs. O-acylated). Moreover, the presence of cationic serine-based amphiphiles on the surface enhances the catalytic efficiency by another ∼2-fold, whereas the presence of anionic aspartic acid-based amphiphiles reduces the catalytic activity. Ester partitioning into the surface, reactivity, and the accumulation of liberated fatty acid explain the substrate selectivity of the catalytic surface, where the hexyl esters were found to be more hydrolytic than other fatty acyl esters. Di-methylation of the -NH2 of OLH increases the catalytic efficacy by a further ∼2-fold, whereas trimethylation reduces the catalytic ability. The self-assembly, charge-charge repulsion, and the H-bonding to the ester carbonyl are likely to be responsible for the superior (∼2500-fold higher rate than the pre-micellar OLH) catalytic efficiency of O-lauryl dimethyl histidine (OLDMH). Thus, prebiotic amino-acid-based surfaces served as an efficient catalyst that exhibits regulation of catalytic function, substrate selectivity, and further adaptability to perform bio-catalysis.
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Affiliation(s)
- Raki Mandal
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur-741246, India.
| | - Anupam Ghosh
- Indian Association for the Cultivation of Science, Raja S. C. Mullick Road, Kolkata 700032, India
| | - Nilesh K Rout
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur-741246, India.
| | - Mahesh Prasad
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur-741246, India.
| | - Bibhas Hazra
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur-741246, India.
| | - Sanu Sar
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur-741246, India.
| | - Subrata Das
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur-741246, India.
| | - Ayan Datta
- Indian Association for the Cultivation of Science, Raja S. C. Mullick Road, Kolkata 700032, India
| | - Pradip K Tarafdar
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur-741246, India.
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3
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Xie T, Zhou L, Han L, Cui W, Liu Z, Cheng Z, Guo J, Zhou Z. Modulating the pH profile of the pullulanase from Pyrococcus yayanosii CH1 by synergistically engineering the active center and surface. Int J Biol Macromol 2022; 216:132-139. [PMID: 35777517 DOI: 10.1016/j.ijbiomac.2022.06.151] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Revised: 06/14/2022] [Accepted: 06/23/2022] [Indexed: 11/24/2022]
Abstract
A preferable pullulanase with high thermostability and catalytic activity at pH 4.5-5 is desired to match with glucoamylase in the starch-saccharification process. However, most of them exhibit low activity under such low pH conditions. Here, the optimal pH of the hyperthermostable pullulanase from Pyrococcus yayanosii (PulPY2) was successfully shifted from 6.4 to 5 with a 2-fold increase in the specific activity based on synergistic engineering of the active center and surface. Synergistic engineering was performed by introducing histidine within 6 Å of the active sites, and by enhancing negative charges on the enzymatic surface. Two single-site mutants of PulPY2-Q13H and PulPY2-I25E with higher hydrolytic activity were obtained, the optimal pH of which was shifted to pH 5 and 5.4, respectively; the combined mutant PulPY2-Q13H/I25E exhibited the optimal pH of 5, 3.2-fold increasing catalytic efficiency at pH 5, and high thermostability compared to PulPY2. These results not only obtained an applicable pullulanase for industrial application, but also provided a strategy for shifting the optimal pH of the enzyme based on synergistic engineering of the active center and surface.
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Affiliation(s)
- Ting Xie
- The Key Laboratory of Industrial Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, People's Republic of China
| | - Li Zhou
- The Key Laboratory of Industrial Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, People's Republic of China
| | - Laichuang Han
- The Key Laboratory of Industrial Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, People's Republic of China
| | - Wenjing Cui
- The Key Laboratory of Industrial Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, People's Republic of China
| | - Zhongmei Liu
- The Key Laboratory of Industrial Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, People's Republic of China
| | - Zhongyi Cheng
- The Key Laboratory of Industrial Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, People's Republic of China
| | - Junling Guo
- The Key Laboratory of Industrial Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, People's Republic of China
| | - Zhemin Zhou
- The Key Laboratory of Industrial Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, People's Republic of China.
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4
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Cvitkovic JP, Pauplis CD, Kaminski GA. PKA17-A Coarse-Grain Grid-Based Methodology and Web-Based Software for Predicting Protein pK a Shifts. J Comput Chem 2019; 40:1718-1726. [PMID: 30895643 DOI: 10.1002/jcc.25826] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Accepted: 02/26/2019] [Indexed: 11/09/2022]
Abstract
We have developed and tested PKA17, a coarse-grain grid-based model for predicting protein pK a shifts. Our pK a predictor is currently deployed via a website interface. We have carried out parameter fitting using 442 Asp, Glu, His, Lys, and Arg residues for which experimental results are available in the literature. PROPKA software has been used for benchmarking. The average unsigned error and root-mean-square deviation (RMSD) have been found to be 0.628 and 0.831 pH units, respectively, for PKA17. The corresponding results with PROPKA are 0.761 and 1.063 units. We have assessed the robustness of the developed PKA17 methodology with a number of tests and have also explored the possibility of using a combination of PROPKA and PKA17 calculations in order to improve the accuracy of predicted pK a values for protein residues. We have also once again confirmed that protein acidity constants are influenced almost entirely by residues in the immediate spatial proximity of the ionizable amino acids. The resulting PKA17 software has been deployed online with a web-based interface at http://users.wpi.edu/~jpcvitkovic/pka_calc.html. © 2019 Wiley Periodicals, Inc.
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Affiliation(s)
- John P Cvitkovic
- Department of Chemistry and Biochemistry, Worcester Polytechnic Institute, 100 Institute Rd., Worcester, Massachusetts, 01609
| | - Connor D Pauplis
- Department of Chemistry and Biochemistry, Worcester Polytechnic Institute, 100 Institute Rd., Worcester, Massachusetts, 01609
| | - George A Kaminski
- Department of Chemistry and Biochemistry, Worcester Polytechnic Institute, 100 Institute Rd., Worcester, Massachusetts, 01609
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Caselle EA, Yoon JH, Bhattacharya S, Rempillo JJ, Lengyel Z, D’Souza A, Moroz YS, Tolbert PL, Volkov AN, Forconi M, Castañeda CA, Makhlynets OV, Korendovych IV. Kemp Eliminases of the AlleyCat Family Possess High Substrate Promiscuity. ChemCatChem 2019; 11:1425-1430. [PMID: 31788134 PMCID: PMC6884320 DOI: 10.1002/cctc.201801994] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Indexed: 10/21/2023]
Abstract
Minimalist enzymes designed to catalyze model reactions provide useful starting points for creating catalysts for practically important chemical transformations. We have shown that Kemp eliminases of the AlleyCat family facilitate conversion of leflunomide (an immunosupressor pro-drug) to its active form teriflunomide with outstanding rate enhancement (nearly four orders of magnitude) and catalytic proficiency (more than seven orders of magnitude) without any additional optimization. This remarkable activity is achieved by properly positioning the substrate in close proximity to the catalytic glutamate with very high pKa.
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Affiliation(s)
- Elizabeth A. Caselle
- Department of Chemistry, Syracuse University, 111 College Place, Syracuse, NY 13244, USA
| | - Jennifer H. Yoon
- Department of Chemistry, Syracuse University, 111 College Place, Syracuse, NY 13244, USA
| | - Sagar Bhattacharya
- Department of Chemistry, Syracuse University, 111 College Place, Syracuse, NY 13244, USA
| | - Joel J.L. Rempillo
- Department of Chemistry, Syracuse University, 111 College Place, Syracuse, NY 13244, USA
| | - Zsófia Lengyel
- Department of Chemistry, Syracuse University, 111 College Place, Syracuse, NY 13244, USA
| | - Areetha D’Souza
- Department of Chemistry, Syracuse University, 111 College Place, Syracuse, NY 13244, USA
| | - Yurii S. Moroz
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64 Volodymyrska St., Kyiv 01601, Ukraine
| | - Patricia L. Tolbert
- Department of Chemistry, Syracuse University, 111 College Place, Syracuse, NY 13244, USA
| | - Alexander N. Volkov
- VIB Centre for Structural Biology, Vlaams Instituut voor Biotechnologie (VIB), Pleinlaan 2, Brussels 1050, Belgium
- Jean Jeener NMR Cetre, Vrije Universiteit Brussel (VUB), Pleinlaan 2, Brussels 1050, Belgium
| | - Marcello Forconi
- Department of Chemistry and Biochemistry, College of Charleston, 66 George St. Charleston, SC 29424, USA
| | - Carlos A. Castañeda
- Department of Chemistry, Syracuse University, 111 College Place, Syracuse, NY 13244, USA
| | - Olga V. Makhlynets
- Department of Chemistry, Syracuse University, 111 College Place, Syracuse, NY 13244, USA
| | - Ivan V. Korendovych
- Department of Chemistry, Syracuse University, 111 College Place, Syracuse, NY 13244, USA
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6
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Lechner H, Ferruz N, Höcker B. Strategies for designing non-natural enzymes and binders. Curr Opin Chem Biol 2018; 47:67-76. [PMID: 30248579 DOI: 10.1016/j.cbpa.2018.07.022] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2018] [Revised: 07/16/2018] [Accepted: 07/17/2018] [Indexed: 12/20/2022]
Abstract
The design of tailor-made enzymes is a major goal in biochemical research that can result in wide-range applications and will lead to a better understanding of how proteins fold and function. In this review we highlight recent advances in enzyme and small molecule binder design. A focus is placed on novel strategies for the design of scaffolds, developments in computational methods, and recent applications of these techniques on receptors, sensors, and enzymes. Further, the integration of computational and experimental methodologies is discussed. The outlined examples of designed enzymes and binders for various purposes highlight the importance of this topic and underline the need for tailor-made proteins.
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Affiliation(s)
- Horst Lechner
- Department of Biochemistry, University of Bayreuth, 95447 Bayreuth, Germany
| | - Noelia Ferruz
- Department of Biochemistry, University of Bayreuth, 95447 Bayreuth, Germany
| | - Birte Höcker
- Department of Biochemistry, University of Bayreuth, 95447 Bayreuth, Germany.
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Vercoulen Y, Kondo Y, Iwig JS, Janssen AB, White KA, Amini M, Barber DL, Kuriyan J, Roose JP. A Histidine pH sensor regulates activation of the Ras-specific guanine nucleotide exchange factor RasGRP1. eLife 2017; 6:29002. [PMID: 28952923 PMCID: PMC5643099 DOI: 10.7554/elife.29002] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Accepted: 09/05/2017] [Indexed: 02/04/2023] Open
Abstract
RasGRPs are guanine nucleotide exchange factors that are specific for Ras or Rap, and are important regulators of cellular signaling. Aberrant expression or mutation of RasGRPs results in disease. An analysis of RasGRP1 SNP variants led to the conclusion that the charge of His 212 in RasGRP1 alters signaling activity and plasma membrane recruitment, indicating that His 212 is a pH sensor that alters the balance between the inactive and active forms of RasGRP1. To understand the structural basis for this effect we compared the structure of autoinhibited RasGRP1, determined previously, to those of active RasGRP4:H-Ras and RasGRP2:Rap1b complexes. The transition from the autoinhibited to the active form of RasGRP1 involves the rearrangement of an inter-domain linker that displaces inhibitory inter-domain interactions. His 212 is located at the fulcrum of these conformational changes, and structural features in its vicinity are consistent with its function as a pH-dependent switch.
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Affiliation(s)
- Yvonne Vercoulen
- Department of Anatomy, University of California, San Francisco, San Francisco, United States.,Molecular Cancer Research, Center for Molecular Medicine, UMC Utrecht, Utrecht University, Utrecht, Netherlands
| | - Yasushi Kondo
- Department of Molecular and Cell Biology and Chemistry, University of California, Berkeley, United States.,California Institute for Quantitative Biosciences, University of California, Berkeley, United States
| | - Jeffrey S Iwig
- Department of Molecular and Cell Biology and Chemistry, University of California, Berkeley, United States.,California Institute for Quantitative Biosciences, University of California, Berkeley, United States
| | - Axel B Janssen
- Department of Anatomy, University of California, San Francisco, San Francisco, United States
| | - Katharine A White
- Department of Cell and Tissue Biology, University of California, San Francisco, San Francisco, United States
| | - Mojtaba Amini
- Molecular Cancer Research, Center for Molecular Medicine, UMC Utrecht, Utrecht University, Utrecht, Netherlands
| | - Diane L Barber
- Department of Cell and Tissue Biology, University of California, San Francisco, San Francisco, United States
| | - John Kuriyan
- Department of Molecular and Cell Biology and Chemistry, University of California, Berkeley, United States.,California Institute for Quantitative Biosciences, University of California, Berkeley, United States.,Howard Hughes Medical Institute, University of California, Berkeley, United States.,Department of Chemistry, University of California, Berkeley, United States.,Divisions of Molecular Biophysics and Integrated Bioimaging, Lawrence Berkeley National Laboratory, Berkeley, United States
| | - Jeroen P Roose
- Department of Anatomy, University of California, San Francisco, San Francisco, United States
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