Hydrogenase Mediated Biosynthesis of Catalytically Active Cu Nanoparticles

Byrd, Natalie, Egan Morriss, Christopher, Parker, Joseph, Cai, Rongsheng, Nunn, Elliott J., van Wonderen, Jessica H., Cavet, Jennifer S., Parmeggiani, Fabio, Kimber, Richard L., Gralnick, Jeffrey A., Clarke, Thomas A., Haigh, Sarah J. and Lloyd, Jonathan R. (2025) Hydrogenase Mediated Biosynthesis of Catalytically Active Cu Nanoparticles. Small, 21 (35). ISSN 1613-6810

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Abstract

Shewanella oneidensis MR-1 can biosynthesize cell-supported Cu-nanoparticles (CuNPs), via the bioreduction of Cu(II)(aq), with excellent catalytic activity for click chemistry reactions. However, enzymatic mechanisms underpinning Cu(II) bioreduction were unclear. Here, the oxidation of hydrogen as electron donor was essential for Cu(II) bioreduction by S. oneidensis and hydrogenase deletion mutants were used to demonstrate the critical role of the periplasmic [NiFe] hydrogenase, HyaB. Wild type (WT) cultured cells coupled hydrogen oxidation to biosynthesis of Cu(0)/Cu(I)-NPs within the periplasm (identified using XRD and TEM with SAED, EDS, EELS); ΔhyaB mutants did not produce CuNPs. Biosynthesized CuNPs were catalytically active for the cycloaddition of methyl azidoacetate and 1-hexyne, confirming the potential for microbial revalorization of Cu(II)-containing wastewaters, by forming catalytically active nanomaterials. Identifying HyaB, as a key mediator for Cu(II) reduction in S. oneidensis is an important first step towards developing industrial bioprocesses for Cu(II) recovery and CuNP synthesis, offering a template for improvements using engineering biology. Interestingly, c-type cytochromes, critical for reduction of other metals, were unable to fully reduce Cu(II)(aq) in vivo despite being capable of Cu(II) reduction under in vitro conditions. In fact, Cu inhibited outer membrane cytochrome mediated reduction of Pd(II), and this may impact bioreduction of mixed metal solutions/effluents.

Item Type:	Article
Additional Information:	Data Availability Statement: The data that support the findings of this study are available from the corresponding author upon reasonable request.
Uncontrolled Keywords:	bioreduction,biosynthesis,click chemistry,cu nanoparticle catalyst,hydrogenase,nanobiotechnology,biotechnology,chemistry(all),biomaterials,materials science(all) ,/dk/atira/pure/subjectarea/asjc/1300/1305
Faculty \ School:	Faculty of Science > School of Biological Sciences
UEA Research Groups:	Faculty of Science > Research Centres > Centre for Molecular and Structural Biochemistry
Related URLs:	http://www.scopus.com/inward/record.url?...
Depositing User:	LivePure Connector
Date Deposited:	13 Apr 2026 11:34
Last Modified:	13 Apr 2026 11:34
URI:	https://ueaeprints.uea.ac.uk/id/eprint/102762
DOI:	10.1002/smll.202500210

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