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Sucrose Review

QuestionAnswer
How many sucrose transporters are in Arabidopsis? Rice? How many share 75% identical AA? 50% identity? 9 in Arabidopsis, 5 in rice 75% identical in 1,2, 5-9 50% identity for SUC 3-4
Where are sucrose transporters located? Plasma membrane of SE/CC
Sucrose 2 and 9 doesn't transport? Sucrose, they transport glucosides ( derivatives of glucose)
What is the physiological role of vascular sucrose transporters? Suc4: sucrose uptake at plasma membrane of yeast, involved in sucrose efflux from vacuole
How is sucrose transport at cellular level regulated? regulated at various levels, allowing adaptation to external stimuli such as temperature, light, photoperiod, pathogen attack and other stress
there's a phloem specific transmembrane protein that promotes phloem loading without affecting phloem unloading, what is is called? Tdy1
Regulation of transport activity by phosphorylation? - phosphorylation of N terminus of a sucrose transporter --> AtSUC5 - phosphorylation of serene residue at position 20 --> AtSUC1
Regulation via protein- protein interactions There are specific interactions between transporters - there is plasticity in sugar transporter activity and protein protein interactions of sucrose transporters are not restricted to plasma membrane
Regulation at post transcriptional level microRNA targeted against 7 out of 9 different sucrose transporter genes have been ID-ed, except SUT2 and 4
Where doe sucrose biosynthesis occur? where has it also been found? leaf mesophyll cytoplasm, vacuoles or plastids
Where does the bulk of sucrose go? SE/CC complex by proton symport in apoplasmic loading species
Created by: sunying12
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