Journal of Biological Physics

, Volume 33, Issue 5, pp 357–370

Influence of Distal Residue B10 on CO Dynamics in Myoglobin and Neuroglobin

Original Paper

DOI: 10.1007/s10867-008-9059-2

Cite this article as:
Nienhaus, K. & Nienhaus, G.U. J Biol Phys (2007) 33: 357. doi:10.1007/s10867-008-9059-2

Abstract

For many years, myoglobin has served as a paradigm for structure–function studies in proteins. Ligand binding and migration within myoglobin has been studied in great detail by crystallography and spectroscopy, showing that gaseous ligands such as O2, CO, and NO not only bind to the heme iron but may also reside transiently in three internal ligand docking sites, the primary docking site B and secondary sites C and D. These sites affect ligand association and dissociation in specific ways. Neuroglobin is another vertebrate heme protein that also binds small ligands. Ligand migration pathways in neuroglobin have not yet been elucidated. Here, we have used Fourier transform infrared temperature derivative spectroscopy at cryogenic temperatures to compare the influence of the side chain volume of amino acid residue B10 on ligand migration to and rebinding from docking sites in myoglobin and neuroglobin.

Keywords

Fourier transform infrared spectroscopy Ligand migration Myoglobin Neuroglobin Temperature derivative spectroscopy 

Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.Institute of BiophysicsUniversity of UlmUlmGermany
  2. 2.Department of PhysicsUniversity of Illinois at Urbana-ChampaignUrbanaUSA