Domain-specific effector interactions within the central cavity of human adult hemoglobin in solution and in porous sol-gel matrices: evidence for long-range communication pathways.

Published

Journal Article

The water-filled central cavity of human adult hemoglobin (Hb A) is the binding or interaction site for many different allosteric effectors. Oxygen binding titrations reveal that pyrenetetrasulfonate (PyTS), a fluorescent analogue of 2,3-diphosphoglycerate, behaves like an allosteric effector. The ligation state, pH, and concentrations of other effectors (IHP, L35, and chloride) alter PyTS fluorescence for both solution-phase and sol-gel-encapsulated Hb samples. These conditions also alter the resonance Raman spectra and rates of geminate recombination of CO-ligated Hb. Together, these results demonstrate that there are conformational and functional consequences resulting from interactions between specific domains of the central cavity and individual effectors as well as from long-range synergistic effects that are mediated through the central cavity.

Full Text

Duke Authors

Cited Authors

  • Peterson, ES; Shinder, R; Khan, I; Juczszak, L; Wang, J; Manjula, B; Acharya, SA; Bonaventura, C; Friedman, JM

Published Date

  • April 2004

Published In

Volume / Issue

  • 43 / 16

Start / End Page

  • 4832 - 4843

PubMed ID

  • 15096052

Pubmed Central ID

  • 15096052

Electronic International Standard Serial Number (EISSN)

  • 1520-4995

International Standard Serial Number (ISSN)

  • 0006-2960

Digital Object Identifier (DOI)

  • 10.1021/bi035481o

Language

  • eng