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An artificial enzyme is a synthetic organic molecule or ion that recreates one or more functions of a natural enzyme. These molecules aim to achieve catalysis with rates and selectivity comparable to those of naturally occurring enzymes. [1] [2]
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An artificial enzyme is a synthetic organic molecule or ion that recreates one or more functions of a natural enzyme. These molecules aim to achieve catalysis with rates and selectivity comparable to those of naturally occurring enzymes. [1] [2]
Natural enzymes catalyze chemical reactions with high selectivity and efficiency. Catalysis occurs in the enzyme's active site, where substrates bind near functional groups, enabling proximity effects. Artificial enzymes mimic this by combining substrate-binding sites (e.g., cyclodextrins, crown ethers, or calixarenes) with catalytic groups in small molecules. [1] [2]
Advances include artificial enzymes based on amino acids or peptides, such as scaffolded histidine residues mimicking metalloproteins like hemocyanin, tyrosinase, and catechol oxidase. [3] Computational design using tools like Rosetta has enabled de novo creation of artificial enzymes. [4] In 2014, enzymes were created from non-natural molecules. [5] A 2016 book chapter discussed future directions in artificial enzymes. [6]
Nanozymes are nanomaterials exhibiting enzyme-like properties, first coined in 2004. [7] They have applications in biosensing, bioimaging, tumor therapy, and anti-biofouling. [8] [9] Unlike natural enzymes, nanozymes offer stability, multifunctionality, and scalability. [10]
Early discoveries in the 1990s included fullerene derivatives mimicking superoxide dismutase (SOD). [11] The 2000s saw the term "nanozyme" formalized and applications expand, such as nanoceria preventing retinal degeneration [12] and peroxidase-like activity in ferromagnetic nanoparticles for immunoassays. [13]
The 2010s brought numerous reviews and applications, including colorimetric assays, [14] tumor visualization, [15] and anti-biofouling. [16] Key books and reviews emerged, summarizing progress. [17] [8]
In the 2020s, nanozymes advanced in therapeutic applications, such as single-atom nanozymes for sepsis [18] and tumor therapy. [19] Strategies like machine learning aided discovery, [20] and applications in treating conditions like Parkinson's disease and inflammatory bowel disease were reported. [21] [22] Nanozymes were recognized as one of IUPAC's Top Ten Emerging Technologies in Chemistry in 2022. [23]