ArticleThe Journal of biological chemistry2012
Determination of ligand pathways in globins: apolar tunnels versus polar gates.
Article in The Journal of biological chemistry, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 17 papers.
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Who cites it
17 citing papers in PubMed.
- Recombinant Hemoglobin rHb0.1 with Cross-Linked Alpha Subunits Preferentially Crystallizes in the βACS omega · 2026Article
- A versatile delivery vehicle for cellular oxygen and fuels or metabolic sensor? A review and perspective on the functions of myoglobin.Physiological reviews · 2024Review
- Ordered Motions in the Nitric-Oxide Dioxygenase Mechanism of Flavohemoglobin and Assorted Globins with Tightly Coupled Reductases.Advances in experimental medicine and biology · 2023Article
- Kinetic mechanisms for OMolecular aspects of medicine · 2022Review
- Direct observation of ligand migration within human hemoglobin at work.Proceedings of the National Academy of Sciences of the United States of America · 2020Article
- Lessons Learned from 50 Years of Hemoglobin Research: Unstirred and Cell-Free Layers, Electrostatics, Baseball Gloves, and Molten Globules.Antioxidants & redox signaling · 2020Review
- Exploring the entry route of palmitic acid and palmitoylcarnitine into myoglobin.Archives of biochemistry and biophysics · 2018Article
- The nitrite reductase activity of horse heart carboxymethylated-cytochrome c is modulated by cardiolipin.Journal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry · 2016Article
- Molecular Properties of Globin Channels and Pores: Role of Cholesterol in Ligand Binding and Movement.Frontiers in physiology · 2016Article
- Evolutionary and Functional Relationships in the Truncated Hemoglobin Family.PLoS computational biology · 2016Article
- Carbon monoxide binding properties of domain-swapped dimeric myoglobin.Journal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry · 2015Article
- Full kinetics of CO entry, internal diffusion, and exit in myoglobin from transition-path theory simulations.Journal of the American Chemical Society · 2015Article
- Effects of mutations on the molecular dynamics of oxygen escape from the dimeric hemoglobin of Scapharca inaequivalvis.F1000Research · 2015Article
- Anatomy of enzyme channels.BMC bioinformatics · 2014Article
- Internal water and microsecond dynamics in myoglobin.The journal of physical chemistry. B · 2013Article
- An engineered heme-copper center in myoglobin: CO migration and binding.Biochimica et biophysica acta · 2013Article
- Hydrophobic effect drives oxygen uptake in myoglobin via histidine E7.The Journal of biological chemistry · 2013Article
Corrections and comments
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Authors and funding
10 authors.
Funding
Abstract
Although molecular dynamics simulations suggest multiple interior pathways for O(2) entry into and exit from globins, most experiments indicate well defined single pathways. In 2001, we highlighted the effects of large-to-small amino acid replacements on rates for ligand entry and exit onto the three-dimensional structure of sperm whale myoglobin. The resultant map argued strongly for ligand movement through a short channel from the heme iron to solvent that is gated by the distal histidine (His-64(E7)) near the solvent edge of the porphyrin ring. In this work, we have applied the same mutagenesis mapping strategy to the neuronal mini-hemoglobin from Cerebratulus lacteus (CerHb), which has a large internal tunnel from the heme iron to the C-terminal ends of the E and H helices, a direction that is 180° opposite to the E7 channel. Detailed comparisons of the new CerHb map with expanded results for Mb show unambiguously that the dominant (>90%) ligand pathway in CerHb is through the internal tunnel, and the major (>75%) ligand pathway in Mb is through the E7 gate. These results demonstrate that: 1) mutagenesis mapping can identify internal pathways when they exist; 2) molecular dynamics simulations need to be refined to address discrepancies with experimental observations; and 3) alternative pathways have evolved in globins to meet specific physiological demands.
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