Effects of transition metal ions on the catalytic activity of carbonic anhydrase mimics

Changjoon Keum, Min Chul Kim, Sang Yup Lee

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


Many carbonic anhydrase (CA)-mimetic catalysts have active sites composed of a Zn ion coordinated with multiple nitrogens of azacyclic compounds. In this study, some divalent transition metal ions (Co2+, Cd2+, and Ni2+) were examined as potential substitutes for the Zn cofactor when preparing CA-mimetic catalysts by means of self-assembly of histidyl bolaamphiphiles. The self-assembly of histidyl bolaamphiphiles yielded a densely packed histidine imidazole sites offering metal complexation places similar to the triple-histidine imidazoles of natural CA active sites. In the catalytic hydrolysis of p-nitrophenyl acetate, the catalytic efficiency of the mimetic catalysts agreed with the order of catalytic activities of metal-substituted carbonic anhydrases: Zn > Co > Cd ≈ Ni; activation energy of the CA-mimetic catalysts and practical CO2 hydration efficiency also had the same order. However, Co showed better catalytic activity than Zn when the concentrations of metal salts were higher than 0.1 mM because of weakened inhibition by the counter anion. This study elucidated the effect of transition metal ions on the catalytic efficiency of a CA-mimetic catalyst, with emphasis on the coordination of transition metal ions.

Original languageEnglish
Pages (from-to)69-74
Number of pages6
JournalJournal of Molecular Catalysis A: Chemical
Publication statusPublished - 2015 Jul 30

Bibliographical note

Funding Information:
This work was supported by a grant from the Korean Research Foundation, funded by the Korean Government ( NRF-2013R1A1A2006459 ) and by the Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20154010200810 ). We thank Dr. S. K. Jong at KIER for assistance with the CO 2 hydrolysis tests.

Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry


Dive into the research topics of 'Effects of transition metal ions on the catalytic activity of carbonic anhydrase mimics'. Together they form a unique fingerprint.

Cite this