Porphyrin π-stacking in a heme protein scaffold tunes gas ligand affinity

Emily E. Weinert, Christine M. Phillips-Piro, Michael A. Marletta

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


The role of π-stacking in controlling redox and ligand binding properties of porphyrins has been of interest for many years. The recent discovery of H-NOX domains has provided a model system to investigate the role of porphyrin π-stacking within a heme protein scaffold. Removal of a phenylalanine-porphyrin π-stack dramatically increased O2, NO, and CO affinities and caused changes in redox potential (~ 40 mV) without any structural changes. These results suggest that small changes in redox potential affect ligand affinity and that π-stacking may provide a novel route to engineer heme protein properties for new functions.

Original languageEnglish (US)
Pages (from-to)7-12
Number of pages6
JournalJournal of Inorganic Biochemistry
StatePublished - 2013

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Inorganic Chemistry


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