ArticleBMC biochemistry2012
Arg188 in rice sucrose transporter OsSUT1 is crucial for substrate transport.
Article in BMC biochemistry, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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6 citing papers in PubMed, 13 citations in OpenAlex.
- Structure and sucrose binding mechanism of the plant SUC1 sucrose transporter.Nature plants · 2023Article
- Plasmodesmata play pivotal role in sucrose supply to Meloidogyne graminicola-caused giant cells in rice.Molecular plant pathology · 2021Article
- Article
- Expression of Sucrose Transporters fromInternational journal of molecular sciences · 2020Article
- Probing binding specificity of the sucrose transporter AtSUC2 with fluorescent coumarin glucosides.Journal of experimental botany · 2018Article
- Enhanced Sucrose Loading Improves Rice Yield by Increasing Grain Size.Plant physiology · 2015Article
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Authors and funding
2 authors at 1 institution in 1 country.
Funding
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Abstract
backgroundPlant sucrose uptake transporters (SUTs) are H+/sucrose symporters related to the major facilitator superfamily (MFS). SUTs are essential for plant growth but little is known about their transport mechanism. Recent work identified several conserved, charged amino acids within transmembrane spans (TMS) in SUTs that are essential for transport activity. Here we further evaluated the role of one of these positions, R188 in the fourth TMS of OsSUT1, a type II SUT.
resultsThe OsSUT1(R188K) mutant, studied by expression in plants, yeast, and Xenopus oocytes, did not transport sucrose but showed a H+ leak that was blocked by sucrose. The H+ leak was also blocked by β-phenyl glucoside which is not translocated by OsSUT1. Replacing the corresponding Arg in type I and type III SUTs, AtSUC1(R163K) and LjSUT4(R169K), respectively, also resulted in loss of sucrose transport activity. Fluorination at the glucosyl 3 and 4 positions of α-phenyl glucoside greatly decreased transport by wild type OsSUT1 but did not affect the ability to block H+ leak in the R188K mutant.
conclusionOsSUT1 R188 appears to be essential for sucrose translocation but not for substrate interaction that blocks H+ leak. Therefore, we propose that an additional binding site functions in the initial recognition of substrates. The corresponding Arg in type I and III SUTs are equally important. We propose that R188 interacts with glucosyl 3-OH and 4-OH during translocation.
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