An Uncleaved Signal Peptide Directs the Malus xiaojinensis Iron Transporter Protein Mx IRT1 into the ER for the PM Secretory Pathway
| العنوان: | An Uncleaved Signal Peptide Directs the Malus xiaojinensis Iron Transporter Protein Mx IRT1 into the ER for the PM Secretory Pathway |
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| المؤلفون: | Song Tan, Wei-Bing Wang, Na Ren, Shuang Li, Li-Ping Yin, Xiao-Ting Qi, James O. Berry, Peng Zhang, Peng Li, Guang Yang |
| المصدر: | International Journal of Molecular Sciences Volume 15 Issue 11 Pages 20413-20433 International Journal of Molecular Sciences, Vol 15, Iss 11, Pp 20413-20433 (2014) |
| بيانات النشر: | MDPI AG, 2014. |
| سنة النشر: | 2014 |
| مصطلحات موضوعية: | Signal peptide, Iron, iron transport, Molecular Sequence Data, Mutant, Gene Expression, Protein Sorting Signals, Biology, Endoplasmic Reticulum, Article, Catalysis, Green fluorescent protein, lcsh:Chemistry, Inorganic Chemistry, Malus xiaojinensis iron-regulated transporter 1 (Mx IRT1), metal uptake, Amino Acid Sequence, Physical and Theoretical Chemistry, Mx DsIRT1, lcsh:QH301-705.5, Molecular Biology, Peptide sequence, Spectroscopy, Secretory pathway, Plant Proteins, Secretory Pathway, Endoplasmic reticulum, Organic Chemistry, ER (Endoplasmic reticulum) targeting, multi-pass membrane protein, General Medicine, uncleaved signal peptide, Molecular biology, Computer Science Applications, Transport protein, Transmembrane domain, lcsh:Biology (General), lcsh:QD1-999, Malus, Carrier Proteins, Gene Deletion |
| الوصف: | Malus xiaojinensis iron-regulated transporter 1 (Mx IRT1) is a highly effective inducible iron transporter in the iron efficient plant Malus xiaojinensis. As a multi-pass integral plasma membrane (PM) protein, Mx IRT1 is predicted to consist of eight transmembrane domains, with a putative N-terminal signal peptide (SP) of 1–29 amino acids. To explore the role of the putative SP, constructs expressing Mx IRT1 (with an intact SP) and Mx DsIRT1 (with a deleted SP) were prepared for expression in Arabidopsis and in yeast. Mx IRT1 could rescue the iron-deficiency phenotype of an Arabidopsis irt1 mutant, and complement the iron-limited growth defect of the yeast mutant DEY 1453 (fet3fet4). Furthermore, fluorescence analysis indicated that a chimeric Mx IRT1-eGFP (enhanced Green Fluorescent Protein) construct was translocated into the ER (Endoplasmic reticulum) for the PM sorting pathway. In contrast, the SP-deleted Mx DsIRT1 could not rescue either of the mutant phenotypes, nor direct transport of the GFP signal into the ER. Interestingly, immunoblot analysis indicated that the SP was not cleaved from the mature protein following transport into the ER. Taken together, data presented here provides strong evidence that an uncleaved SP determines ER-targeting of Mx IRT1 during the initial sorting stage, thereby enabling the subsequent transport and integration of this protein into the PM for its crucial role in iron uptake. |
| وصف الملف: | application/pdf |
| تدمد: | 1422-0067 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::140bc25af2e9c93828b69630bd73fb77Test https://doi.org/10.3390/ijms151120413Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....140bc25af2e9c93828b69630bd73fb77 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14220067 |
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