ArticleThe Journal of biological chemistry2019
Comparative kinetic isotope effects on first- and second-order rate constants of soybean lipoxygenase variants uncover a substrate-binding network.
Article in The Journal of biological chemistry, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed, 12 citations in OpenAlex.
- Description of the rate-limiting hydrogen tunneling mechanism for plant 9- and 13-lipoxygenases.Protein science : a publication of the Protein Society · 2026Article
- Activation and execution of lipoxygenase catalysis.Redox biochemistry and chemistry · 2026Article
- Computational Method for the Detection of Communication Pathways in Enzymes that Correlate with Experimentally Defined Thermal Activation Networks.The journal of physical chemistry letters · 2026Article
- Correlated Motion-Based Residue Network Analysis Reveals the Distal Thermal Activation in Soybean Lipoxygenase.bioRxiv : the preprint server for biology · 2025Article
- Impact ofBiochemistry · 2024Article
- Temporal and spatial resolution of distal protein motions that activate hydrogen tunneling in soybean lipoxygenase.Proceedings of the National Academy of Sciences of the United States of America · 2023Article
- Building better polymerases: Engineering the replication of expanded genetic alphabets.The Journal of biological chemistry · 2020Review
- Fatty Acid Allosteric Regulation of C-H Activation in Plant and Animal Lipoxygenases.Molecules (Basel, Switzerland) · 2020Review
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Authors and funding
4 authors at 1 institution in 1 country.
Funding
Abstract
Lipoxygenases are widespread enzymes found in virtually all eukaryotes, including fungi, and, more recently, in prokaryotes. These enzymes act on long-chain polyunsaturated fatty acid substrates (C18 to C20), raising questions regarding how the substrate threads its way from solvent to the active site. Herein, we report a comparison of the temperature dependence of isotope effects on first- and second-order rate constants among single-site variants of the prototypic plant enzyme soybean lipoxygenase-1 substituted at amino acid residues inferred to impact substrate binding. We created 10 protein variants including four amino acid positions, Val-750, Ile-552, Ile-839, and Trp-500, located within a previously proposed substrate portal. The conversion of these bulky hydrophobic side chains to smaller side chains is concluded to increase the mobility of flanking helices, giving rise to increased off rates for substrate dissociation from the enzyme. In this manner, we identified a specific "binding network" that can regulate movement of the substrate from the solvent to the active site. Taken together with our previous findings on C-H and O
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