Abstract
Background
Guanosine monophosphate (GMP) synthetase is an enzyme that converts xanthosine monophosphate to GMP. GMP plays an essential role in plant development and responses to internal and external stimuli. It also plays a crucial role in several plant physiochemical processes, such as stomata closure, cation flux regulation, pathogen responses and chloroplast development.
Methods and results
The mRNA sequences of NtGMP synthase in tobacco (Nicotiana tabacum) were rapidly amplified from cDNA. The GMP synthase open reading frame contains a 1617 bp sequence encoding 538 amino acids. A sequence analysis showed that this sequence shares high homology with that of Nicotiana sylvestris, Nicotiana attenuata, N. tomentosiformis, Solanum tuberosum, Lycopersicon pennellii, L. esculentum, Capsicum annuum, C. chinense and C. baccatum GMP synthase. A BLAST analysis with a tobacco high-throughput genomic sequence database revealed that the tobacco GMP synthase gene has five introns and six exons. A phylogenetic analysis showed a close genetic evolutionary relationship with N. sylvestris GMP synthase. The tissue-specific expression profile was evaluated using quantitative real-time PCR. The data showed that NtGMP synthase was highly expressed in leaves and moderately expressed in roots, flowers, and stems. The subcellular localization was predicted using the WOLF PSORT webserver, which strongly suggested that it might be localized to the cytoplasm.
Conclusions
In the current study, we cloned and comprehensively characterized GMP synthase in tobacco (Nicotiana tabacum). Our results establish a basis for further research to explore the precise role of this enzyme in tobacco.
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Funding
This work was supported by the Science and Technology Plan Project of Yunnan Provincial Tobacco Company (2018530000241016, 2018530000241020, 2019530000241028, and 2019530000241011), Shanghai Tobacco Group Co., Ltd. (20193100001 and 20203100001), Yunnan Provincial Department of Science and Technology (2019FH001(-051)) and Science and Technology Project of Yunnan Provincial Education Department (2021J0716).
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Supplementary Figure 1: Prediction of transmembrane helices in the NtGMP synthase protein (gif 4 kb)
11033_2021_6718_MOESM2_ESM.xlsx
Supplementary Table 1: List of NtGMP synthase primers used in the assays. Supplementary Table 2: Accession numbers of GMP synthases retrieved from various plant species. Supplementary Table 3: In silico cis-regulatory elements present in the tobacco GMP synthase sequence (XLSX 21 kb)
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Huang, F., Abbas, F., Fiaz, S. et al. Comprehensive characterization of Guanosine monophosphate synthetase in Nicotiana tabacum. Mol Biol Rep 49, 5265–5272 (2022). https://doi.org/10.1007/s11033-021-06718-x
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DOI: https://doi.org/10.1007/s11033-021-06718-x