AI Article Synopsis
- Crystal structures of hemoglobin show how it controls oxygen binding, but new artificial effector molecules provide even greater control than natural compounds.
- One such compound, bezafibrate (BZF), binds to hemoglobin's alpha subunits, lowering its oxygen affinity without changing it to the tense state.
- A related compound, L35, binds to the central cavity of both R and T state hemoglobin, and the study explores how this affects oxygen affinity based on recent spectroscopic findings.
Article Abstract
Although detailed crystal structures of haemoglobin (Hb) provide a clear understanding of the basic allosteric mechanism of the protein, and how this in turn controls oxygen affinity, recent experiments with artificial effector molecules have shown a far greater control of oxygen binding than with natural heterotropic effectors. Contrary to the established text-book view, these non-physiological compounds are able to reduce oxygen affinity very strongly without switching the protein to the T (tense) state. In an earlier paper we showed that bezafibrate (BZF) binds to a surface pocket on the alpha subunits of R state Hb, strongly reducing the oxygen affinity of this protein conformation. Here we report the crystallisation of Hb with L35, a related compound, and show that this binds to the central cavity of both R and T state Hb. The mechanism by which L35 reduces oxygen affinity is discussed, in relation to spectroscopic studies of effector binding.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.jmb.2005.12.018 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
A new aguanidine-based bis Schiff base for highly selective Al recognition, BSA binding studies and theoretical calculations.
Spectrochim Acta A Mol Biomol Spectrosc
December 2024
School of Agriculture and Bioengineering, Heze University, Heze 274500, China. Electronic address:
Herin, the successful synthesis of a bis Schiff base (L) has been achieved using 2-hydroxy-1-naphthaldehyde and 1,3-diaminoguanidine as raw materials, which was further characterized by infrared spectroscopy, mass spectrometry, and nuclear magnetic resonance hydrogen spectrum. Moreover, spectroscopic experiments demonstrated that the probe L showed good selectivity and visual detectability for Al. Its detection limit (DL) is 2.
View Article and Find Full Text PDFNovel peptide inhibitor of matrix Metalloproteinases-1 from pufferfish skin collagen hydrolysates and its potential Photoprotective activity via the MAPK/AP-1 signaling pathway.
J Photochem Photobiol B
December 2024
Fisheries Research Institute of Fujian, National Research and Development Center for Marine Fish Processing, Key Laboratory of Cultivation and High-value Utilization of Marine Organisms in Fujian Province, Xiamen, China. Electronic address:
Takifugu bimaculatus, a pufferfish species farmed in Fujian Province, is known for its non-toxic flesh and collagen-rich skin. We identified a novel collagen-derived matrix metalloproteinase 1 (MMP-1) inhibitory peptide, from T. bimaculatus skin with potent anti-photoaging properties.
View Article and Find Full Text PDFOpioid-induced respiratory depression: clinical aspects and pathophysiology of the respiratory network effects.
Am J Physiol Lung Cell Mol Physiol
December 2024
The author is retired. The positions and affiliations are those prior to his retirement.
Important insights and consensus remain lacking for risk prediction of opioid-induced respiratory depression (OIRD), reversal of respiratory depression (RD), the pathophysiology of OIRD, and which sites make the most significant contribution to its induction. The ventilatory response to inhaled carbon dioxide is the most sensitive biomarker of OIRD. To accurately predict respiratory depression (RD), a multivariant RD prospective trial using continuous capnograph and oximetry examining 5 independent variables: age ≥60, sex, opioid naivety, sleep disorders, and chronic heart failure (PRODIGY trial), was undertaken.
View Article and Find Full Text PDFMicrotubule-Targeting NAP Peptide-Ru(II)-polypyridyl Conjugate As a Bimodal Therapeutic Agent for Triple Negative Breast Carcinoma.
J Am Chem Soc
December 2024
Department of Chemical Sciences and Center for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur 741246, West Bengal, India.
Triple-negative breast cancer (TNBC) poses significant treatment challenges due to its high metastasis, heterogeneity, and poor biomarker expression. The N-terminus of an octapeptide NAPVSIPQ () was covalently coupled to a carboxylic acid derivative of Ru(2,2'-bipy) () to synthesize an N-stapled short peptide-Rubpy conjugate (). This photosensitizer (PS) was utilized to treat TNBC through microtubule (MT) targeted chemotherapy and photodynamic therapy (PDT).
View Article and Find Full Text PDFRelationship Between Electronegativity of the Extra-Framework Cations and Adsorption Capacity for CO Gas on Mordenite Framework.
Inorg Chem
December 2024
Department of Geological Sciences, Pusan National University, Busan 46241, Korea.
Synthetic mordenite is widely used as a molecular sieve, adsorbent, and catalyst. To enhance these functionalities, it is crucial to understand the ion-exchange properties and cation-exchange sites of the zeolite. In this study, we analyzed the structural changes in fully Cs-, Sr-, Cd-, and Pb-exchanged mordenite by using synchrotron X-ray powder diffraction under ambient conditions.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!