Abstract
The de novo engineering of new proteins will allow the design of complex systems in synthetic biology. But the design of large proteins is very challenging due to the large combinatorial sequence space to be explored and the lack of a suitable selection system to guide the evolution and optimization. One way to approach this challenge is to use computational design methods based on the current crystallographic data and on molecular mechanics. We have used a laccase protein fold as a scaffold to design a new protein sequence that would adopt a 3D conformation in solution similar to a wild-type protein, the Trametes versicolor (TvL) fungal laccase. Laccases are multi-copper oxidases that find utility in a variety of industrial applications. The laccases with highest activity and redox potential are generally secreted fungal glycoproteins. Prokaryotic laccases have been identified with some desirable features, but they often exhibit low redox potentials. The designed sequence (DLac) shares a 50% sequence identity to the original TvL protein. The new DLac gene was overexpressed in E. coli and the majority of the protein was found in inclusion bodies. Both soluble protein and refolded insoluble protein were purified, and their identity was verified by mass spectrometry. Neither protein exhibited the characteristic T1 copper absorbance, neither bound copper by atomic absorption, and neither was active using a variety of laccase substrates over a range of pH values. Circular dichroism spectroscopy studies suggest that the DLac protein adopts a molten globule structure that is similar to the denatured and refolded native fungal TvL protein, which is significantly different from the natively secreted fungal protein. Taken together, these results indicate that the computationally designed DLac expressed in E. coli is unable to utilize the same folding pathway that is used in the expression of the parent TvL protein or the prokaryotic laccases. This sequence can be used going forward to help elucidate the sequence requirements needed for prokaryotic multi-copper oxidase expression.
Similar content being viewed by others
References
Alexandre G, Zhulin IB (2000) Laccases are widespread in bacteria. Trends Biotechnol 18:41–42
Barton SC, Gallaway J, Atanassov P (2004) Enzymatic biofuel cells for implantable and microscale devices. Chem Rev 104:4867–4886
Brissos V, Pereira L, Munteanu FD, Cavaco-Paulo A, Martins LO (2009) Expression system of CotA-laccase for directed evolution and high-throughput screenings for the oxidation of high-redox potential dyes. Biotechnol J 4:558–563
Bulter T, Alcalde M, Sieber V, Meinhold P, Schlachtbauer C, Arnold FH (2003) Functional expression of a fungal laccase in Saccharomyces cerevisiae by directed evolution. Appl Environ Microbiol 69:987–995
Claus H (2003) Laccases and their occurrence in prokaryotes. Arch Microbiol 179:145–150
Dunbrack RL, Karplus M (1993) Backbone-dependent rotamer library for proteins—application to side-chain prediction. J Mol Biol 230:543–574
Durão P, Bento I, Fernandes A, Melo E, Lindley PF, Martins L (2006) Perturbations of the T1 copper site in the CotA laccase from Bacillus subtilis: structural, biochemical, enzymatic and stability studies. J Biol Inorg Chem 11:514–526
Durão P, Chen Z, Fernandes A, Hildebrandt P, Murgida D, Todorovic S, Pereira M, Melo E, Martins L (2008) Copper incorporation into recombinant CotA laccase from Bacillus subtilis: characterization of fully copper loaded enzymes. J Biol Inorg Chem 13:183–193
Endo K, Hayashi Y, Hibi T, Hosono K, Beppu T, Ueda K (2003) Enzymological characterization of EpoA, a laccase-like phenol oxidase produced by Streptomyces griseus. J Biochem (Tokyo) 133:671–677
Festa G, Autore F, Fraternali F, Giardina P, Sannia G (2008) Development of new laccases by directed evolution: functional and computational analyses. Proteins 72:25–34
Gallaway J, Wheeldon I, Rincon R, Atanassov P, Banta S, Barton SC (2008) Oxygen-reducing enzyme cathodes produced from SLAC, a small laccase from Streptomyces coelicolor. Biosens Bioelectron 23:1229–1235
Gelo-Pujic M, Kim HH, Butlin NG, Palmore GT (1999) Electrochemical studies of a truncated laccase produced in Pichia pastoris. Appl Environ Microbiol 65:5515–5521
Giardina P, Faraco V, Pezzella C, Piscitelli A, Vanhulle S, Sannia G (2010) Laccases: a never-ending story. Cell Mol Life Sci 67:369–385
Glykys DJ, Banta S (2009) Metabolic control analysis of an enzymatic biofuel cell. Biotechnol Bioeng 102:1624–1635
Greenfield NJ (2006) Determination of the folding of proteins as a function of denaturants, osmolytes or ligands using circular dichroism. Nat Protoc 1:2733–2741
Gupta N, Farinas ET (2009) Narrowing laccase substrate specificity using active site saturation mutagenesis. Comb Chem High Throughput Screen 12:269–274
Hudak NS, Barton SC (2005) Mediated biocatalytic cathode for direct methanol membrane-electrode assemblies. J Electrochem Soc 152:A876–A881
Jaramillo A, Wernisch L, Hery S, Wodak SJ (2002) Folding free energy function selects native-like protein sequences in the core but not on the surface. Proc Natl Acad Sci USA 99:13554–13559
Kabsch W, Sander C (1983) Dictionary of protein secondary structure—pattern-recognition of hydrogen-bonded and geometrial features. Biopolymers 22:2577–2637
Kunamneni A, Camarero S, Garcia-Burgos C, Plou FJ, Ballesteros A, Alcalde M (2008) Engineering and Applications of fungal laccases for organic synthesis. Microb Cell Fact 7:32
Li X, Wei Z, Zhang M, Peng X, Yu G, Teng M, Gong W (2007) Crystal structures of E. coli laccase CueO at different copper concentrations. Biochem Biophys Res Commun 354:21–26
López-Cruz JI, Viniegra-Gonzalez G, Hernández-Arana A (2006) Thermostability of native and pegylated Myceliophthora thermophila laccase in aqueous and mixed solvents. Bioconjug Chem 17:1093–1098
Machczynski MC, Vijgenboom E, Samyn B, Canters GW (2004) Characterization of SLAC: a small laccase from Streptomyces coelicolor with unprecedented activity. Protein Sci 13:2388–2397
Madzak C, Mimmi MC, Caminade E, Brault A, Baumberger S, Briozzo P, Mougin C, Jolivalt C (2006) Shifting the optimal pH of activity for a laccase from the fungus Trametes versicolor by structure-based mutagenesis. Protein Eng Des Sel 19:77–84
Martins LO, Soares CM, Pereira MM, Teixeira M, Costa T, Jones GH, Henriques AO (2002) Molecular and biochemical characterization of a highly stable bacterial laccase that occurs as a structural component of the Bacillus subtilis endospore coat. J Biol Chem 277:18849–18859
Mayer AM, Staples RC (2002) Laccase: new functions for an old enzyme. Phytochemistry 60:551–565
Nakamura K, Go N (2005) Function and molecular evolution of multicopper blue proteins. Cell Mol Life Sci 62:2050–2066
Ogata K, Jaramillo A, Cohen W, Briand JP, Connan F, Choppin J, Muller S, Wodak SJ (2003) Automatic sequence design of major histocompatibility complex class I binding peptides impairing CD8(+) T cell recognition. J Biol Chem 278:1281–1290
Ooi T, Oobatake M, Nemethy G, Scheraga HA (1987) Accesible surface-areas as a measure of the thermodynamic parameters of hydration of peptides. Proc Natl Acad Sci USA 84:3086–3090
Petrek M, Otyepka M, Banas P, Kosinova P, Koca J, Damborsky J (2006) CAVER: a new tool to explore routes from protein clefts, pockets and cavities. BMC Bioinform 7:316
Piontek K, Antorini M, Choinowski T (2002) Crystal structure of a laccase from the fungus Trametes versicolor at 1.90-A resolution containing a full complement of coppers. J Biol Chem 277:37663–37669
Riva S (2006) Laccases: blue enzymes for green chemistry. Trends Biotechnol 24:219–226
Rodgers CJ, Blanford CF, Giddens SR, Skamnioti P, Armstrong FA, Gurr SJ (2010) Designer laccases: a vogue for high-potential fungal enzymes? Trends Biotechnol 28:63–72
Sakasegawa S, Ishikawa H, Imamura S, Sakuraba H, Goda S, Ohshima T (2006) Bilirubin oxidase activity of Bacillus subtilis CotA. Appl Environ Microbiol 72:972–975
Sakurai T, Kataoka K (2007) Basic and applied features of multicopper oxidases, CueO, bilirubin oxidase, and laccase. Chem Rec 7:220–229
Salony GargN, Baranwal R, Chhabra M, Mishra S, Chaudhuri TK, Bisaria VS (2008) Laccase of Cyathus bulleri: structural, catalytic characterization and expression in Escherichia coli. Biochim Biophys Acta 1784:259–268
Sedlak E, Wittung-Stafshede P (2007) Discrete roles of copper ions in chemical unfolding of human ceruloplasmin. Biochemistry 46:9638–9644
Shleev S, Tkac J, Christenson A, Ruzgas T, Yaropolov AI, Whittaker JW, Gorton L (2005) Direct electron transfer between copper-containing proteins and electrodes. Biosens Bioelectron 20:2517–2554
Skalova T, Dohnalek J, Ostergaard LH, Osteryaard PR, Kolenko P, Duskova J, Stepankova A, Hasek J (2009) The structure of the small laccase from Streptomyces coelicolor reveals a link between laccases and nitrite reductases. J Mol Biol 385:1165–1178
Solomon EI, Sundaram UM, Machonkin TE (1996) Multicopper oxidases and oxygenases. Chem Rev 96:2563–2606
Suarez M, Jaramillo A (2009) Challenges in the computational design of proteins. J R Soc Interface 6(Suppl 4):S477–S491
Tortosa P, Jaramillo A (2006) Active sites by computational protein design. In: Proceedings of the II BIFI 2006 international conference, pp 96–101
Villalobos A, Ness JE, Gustafsson C, Minshull J, Govindarajan S (2006) Gene designer: a synthetic biology tool for constructing artificial DNA segments. BMC Bioinform 7:285
Walker JM (2005) The proteomics protocols handbook. Humana Press, Totowa
Wernisch L, Hery S, Wodak SJ (2000) Automatic protein design with all atom force-fields by exact and heuristic optimization. J Mol Biol 301:713–736
Wheeldon IR, Gallaway JW, Barton SC, Banta S (2008) Bioelectrocatalytic hydrogels from electron-conducting metallopolypeptides coassembled with bifunctional enzymatic building blocks. Proc Natl Acad Sci U S A 105:15275–15280
Xu F (1997) Effects of redox potential and hydroxide inhibition on the pH activity profile of fungal laccases. J Biol Chem 272:924–928
Xu F, Shin W, Brown SH, Wahleithner JA, Sundaram UM, Solomon EI (1996) A study of a series of recombinant fungal laccases and bilirubin oxidase that exhibit significant differences in redox potential, substrate specificity, and stability. Biochim Biophys Acta 1292:303–311
Xu F, Berka RM, Wahleithner JA, Nelson BA, Shuster JR, Brown SH, Palmer AE, Solomon EI (1998) Site-directed mutations in fungal laccase: effect on redox potential, activity and pH profile. Biochem J 334(Pt 1):63–70
Xu F, Palmer AE, Yaver DS, Berka RM, Gambetta GA, Brown SH, Solomon EI (1999) Targeted mutations in a Trametes villosa laccase. Axial perturbations of the T1 copper. J Biol Chem 274:12372–12375
Acknowledgments
The authors would like to acknowledge the financial support of a Joint Research Project Award from the Alliance Program involving Columbia University and École Polytechnique awarded to S. B and A. J. Financial support was also provided by an AFOSR MURI award (FA9550-06-1-0264) to S. B. D. J. G. acknowledges support from Merck & Co., Inc. and G. S. Z. from the Academy of Finland and the Alfred Kordelin Foundation. A. J. acknowledges support from FP6-NEST-043340 (BioModularH2), FP7-ICT-043338 (Bactocom), FP7-KBBE-212894 (Tarpol), the ATIGE-Genopole and the Fondation pour la Recherche Medicale. A. J. also acknowledges the HPC-Europa program (RII3-CT-2003-506079) and the BSC for supercomputing time. The authors also thank Dr. Ian Wheeldon for the expression and purification of the SLAC protein.
Author information
Authors and Affiliations
Corresponding author
Electronic supplementary material
Below is the link to the electronic supplementary material.
11693_2011_9080_MOESM1_ESM.doc
The supplementary material available in the electronic edition contains the DNA sequence of the DLac gene, buffers and substrates used in the kinetics measurements, and a summary of the mass spectrometry results for the DLac proteins (Glykys et al. Supp Mat.doc) A PDB file of the modeled DLac protein is also included in Supplementary Material. (DOC 88 kb)
Rights and permissions
About this article
Cite this article
Glykys, D.J., Szilvay, G.R., Tortosa, P. et al. Pushing the limits of automatic computational protein design: design, expression, and characterization of a large synthetic protein based on a fungal laccase scaffold. Syst Synth Biol 5, 45–58 (2011). https://doi.org/10.1007/s11693-011-9080-9
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11693-011-9080-9