Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2024 Jul 8;15:5714. doi: 10.1038/s41467-024-50005-9

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© The Author(s) 2024

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

PMC Copyright notice

Fig. 1 — A A cartoon representation of the His in the catalytic center of esterase- and heme-dependent enzymes was generated using PyMOL (the structures of esterase and myoglobin were generated from the PDB files 6q7o and 5oj9). B pKa comparison of imidazole and its derivatives. C Comparison of the surface charges of imidazole and its derivatives. D pKa ranges of natural amino acid sidechains and imidazole derivatives. E Scheme of the evolution of enzymes enabled by Nδ-vinyl histidine. Source data are provided as a Source Data file.