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Hemoglobin structure and function
Research Guide
What is Hemoglobin structure and function?
Hemoglobin structure and function refers to the molecular architecture and oxygen-binding mechanisms of hemoglobin, a tetrameric protein in vertebrate red blood cells that transports oxygen while also interacting with gases like carbon monoxide and nitric oxide.
This field encompasses 62,183 papers on hemoglobin's role in oxygen transport, regulation, and physiological effects in vertebrates, including interactions with scavenger receptor CD163, neuroglobin, myoglobin, and haptoglobin. Research covers nitric oxide dioxygenase activity and flavohemoglobin-mediated detoxification of nitric oxide. Hemoglobin-based oxygen carriers are examined for potential cardiovascular applications.
Topic Hierarchy
Research Sub-Topics
Neuroglobin Function
This sub-topic examines the biochemical properties, oxygen-binding mechanisms, and neuroprotective roles of neuroglobin in vertebrate brain tissues. Researchers investigate its expression patterns, evolutionary adaptations, and interactions with reactive oxygen species.
Myoglobin Function
This area focuses on myoglobin's role in oxygen storage, diffusion facilitation, and scavenging of nitric oxide within skeletal and cardiac muscle cells. Studies explore its structural dynamics, allosteric regulation, and physiological impacts under hypoxic conditions.
Scavenger Receptor CD163 Expression
Researchers study the regulation of CD163 expression on macrophages and its role in hemoglobin-haptoglobin complex clearance and anti-inflammatory responses. This includes transcriptional control, cytokine modulation, and implications in hemolytic disorders.
Nitric Oxide Dioxygenase Activity
This sub-topic investigates the enzymatic dioxygenase activity of globins in detoxifying nitric oxide, including kinetics, structural determinants, and physiological roles in vasodilation and pathogen defense. Experimental work uses spectroscopy and mutagenesis to elucidate mechanisms.
Hemoglobin-Based Oxygen Carriers
Studies develop and evaluate hemoglobin-based oxygen carriers (HBOCs) for blood substitution, focusing on stability, oxygen delivery efficiency, and side effects like vasoconstriction. Research includes polymer encapsulation and clinical trial outcomes.
Why It Matters
Hemoglobin's function impacts oxygen delivery in vertebrates, with studies on nitric oxide synthetase isolation revealing its role in vascular relaxation and immune responses, as shown by Bredt and Snyder (1990) who isolated a calmodulin-requiring enzyme producing nitric oxide from arginine. Flavohemoglobins detoxify nitric oxide, protecting cells during stress, while hemoglobin-based oxygen carriers offer alternatives to blood transfusions, potentially reducing cardiovascular disease risks. These insights support developments in protein therapeutics, such as tumor-targeted conjugates demonstrating enhanced accumulation in tumor tissues (Matsumura and Maeda, 1986).
Reading Guide
Where to Start
"The Carbon Monoxide-binding Pigment of Liver Microsomes" by Omura and Sato (1964), as it provides foundational insights into hemoglobin-related pigment binding, essential for understanding gas interactions in oxygen transport.
Key Papers Explained
Omura and Sato (1964) "The Carbon Monoxide-binding Pigment of Liver Microsomes" establishes gas-binding properties relevant to hemoglobin function. Matsumura and Maeda (1986) "A new concept for macromolecular therapeutics in cancer chemotherapy: mechanism of tumoritropic accumulation of proteins and the antitumor agent smancs" extends protein carrier concepts to hemoglobin-based systems. Bredt and Snyder (1990) "Isolation of nitric oxide synthetase, a calmodulin-requiring enzyme" connects nitric oxide production to hemoglobin's detoxification role, building a regulatory framework.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Current research emphasizes hemoglobin-based oxygen carriers for cardiovascular therapy and globin family roles in nitric oxide handling, with ongoing focus on CD163 expression and haptoglobin phenotypes. No recent preprints available.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | The Carbon Monoxide-binding Pigment of Liver Microsomes | 1964 | Journal of Biological ... | 11.8K | ✓ |
| 2 | A new concept for macromolecular therapeutics in cancer chemot... | 1986 | PubMed | 6.8K | ✕ |
| 3 | [49] Determination of carbonyl content in oxidatively modified... | 1990 | Methods in enzymology ... | 5.8K | ✕ |
| 4 | Interaction Models for Water in Relation to Protein Hydration | 1981 | Jerusalem Symposia on ... | 5.6K | ✕ |
| 5 | Hydrodynamics of soft active matter | 2013 | Reviews of Modern Physics | 3.9K | ✕ |
| 6 | Small-Angle X-Ray Scattering | 2016 | — | 3.8K | ✕ |
| 7 | Atomic structure and chemistry of human serum albumin | 1992 | Nature | 3.8K | ✕ |
| 8 | Living with Water Stress: Evolution of Osmolyte Systems | 1982 | Science | 3.7K | ✕ |
| 9 | The Anatomy and Taxonomy of Protein Structure | 1981 | Advances in protein ch... | 3.4K | ✕ |
| 10 | Isolation of nitric oxide synthetase, a calmodulin-requiring e... | 1990 | Proceedings of the Nat... | 3.3K | ✕ |
Frequently Asked Questions
What is the primary function of hemoglobin?
Hemoglobin functions as an oxygen carrier in vertebrate red blood cells, binding and transporting oxygen via its tetrameric structure. It also exhibits nitric oxide dioxygenase activity and interacts with carbon monoxide, as evidenced by binding studies in liver microsomes (Omura and Sato, 1964). These properties enable physiological regulation and detoxification.
How does hemoglobin interact with nitric oxide?
Hemoglobin and related flavohemoglobins detoxify nitric oxide through dioxygenase activity, converting it to less harmful products. Nitric oxide synthetase, isolated by Bredt and Snyder (1990), produces nitric oxide from arginine, influencing vascular and immune functions modulated by hemoglobin. This interaction maintains cellular homeostasis.
What role does scavenger receptor CD163 play with hemoglobin?
Scavenger receptor CD163 mediates haptoglobin-hemoglobin complex clearance, regulating free hemoglobin levels post-hemolysis. Its expression links to hemoglobin's physiological impact in vertebrates. This process prevents oxidative damage from unbound heme.
What are hemoglobin-based oxygen carriers?
Hemoglobin-based oxygen carriers are engineered proteins designed to mimic hemoglobin's oxygen transport for transfusions. They address limitations in blood supply and are studied for cardiovascular applications. Research highlights their potential despite stability challenges.
How do neuroglobin and myoglobin relate to hemoglobin function?
Neuroglobin and myoglobin, globin family members, support oxygen storage and delivery akin to hemoglobin. Neuroglobin functions in neurons, myoglobin in muscles, complementing systemic oxygen transport. Their roles extend to nitric oxide handling.
What is the significance of haptoglobin phenotype?
Haptoglobin phenotype affects hemoglobin binding efficiency after red cell lysis, influencing free heme clearance. Variations impact oxidative stress and disease susceptibility. Studies link it to hemoglobin regulation in vertebrates.
Open Research Questions
- ? How do structural variations in hemoglobin's heme pocket precisely modulate carbon monoxide versus oxygen binding affinity?
- ? What are the evolutionary adaptations of flavohemoglobins for nitric oxide detoxification across vertebrate species?
- ? How does CD163 expression dynamically regulate hemoglobin-haptoglobin complex clearance under hemolytic stress?
- ? What molecular mechanisms underlie neuroglobin and myoglobin's roles in cellular oxygen sensing beyond storage?
- ? Can hemoglobin-based oxygen carriers be optimized to avoid vasoconstriction in cardiovascular applications?
Recent Trends
The field maintains 62,183 works with no reported 5-year growth rate.
Keyword trends highlight nitric oxide dioxygenase activity, flavohemoglobin detoxification, and hemoglobin-based oxygen carriers, as per cluster description.
Top-cited works like Omura and Sato with 11,824 citations underscore persistent interest in gas-binding mechanisms.
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