Mb reaction with benzyl diazoketone. (IMAGE) Stevens Institute of Technology Caption a Mb(H64G,V68A)-catalyzed cyclopropanation of styrene with benzyl diazoketone (BDK) and substrate scope of the biocatalyst (box; R = aryl or alkyl; R’ = H or Me). b Color change of a Mb(H64G,V68A) solution upon addition of BDK (box) and corresponding transition in the UV-Vis absorption spectrum (2 mM Mb(H64G,V68A)) in 50 mM sodium borate buffer (NaBB) (pH 9.0), anaerobic conditions, before (red curve) and after (green curve) addition of BDK. Credit Nam, D., Bacik, JP., Khade, R.L. et al. Mechanistic manifold in a hemoprotein-catalyzed cyclopropanation reaction with diazoketone. Nat Commun 14, 7985 (2023). https://doi.org/10.1038/s41467-023-43559-7 Usage Restrictions Open-access License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.