Abstract:
:Chloroplast, the energy organelle unique to plant cells, is a dynamic entity which integrates an array of metabolic pathways and serves as first level for energy conversion for the entire ecological hierarchy. Increasing amount of sequence data and evolution of mass spectrometric approaches has opened up new avenues for opportune exploration of the global proteome of this organelle. In our study, we aimed at generation of a comprehensive catalogue of chloroplast proteins in a grain legume, chickpea and provided a reference proteome map. To accurately assign the identified proteins, purity of chloroplast-enriched fraction was stringently monitored by multiple chemical and immunological indexes, besides pigment and enzyme analyses. The proteome analysis led to the identification of 2451 proteins, including 27 isoforms, which include predicted and novel chloroplast constituents. The identified proteins were validated through their sequence analysis. Extensive sequence based localization prediction revealed more than 50% proteins to be chloroplast resident by at least two different algorithms. Chromosomal distribution of identified proteins across nuclear and chloroplast genome unveiled the presence of 55 chloroplast encoded gene. In depth comparison of our dataset with the non-redundant set of chloroplast proteins identified so far across other species revealed novel as well as overlapping candidates. BIOLOGICAL SIGNIFICANCE:Pulses add large amount of nitrogen to the soil and has very low water footprint and therefore, contributes to fortification of sustainable agriculture. Chickpea is one of the earliest cultivated legumes and serves as an energy and protein source for humans and animals. Chloroplasts are the unique organelles which conduct photosynthesis. Investigation on chloroplast proteome is of particular significance, especially to plant biologists, as it would allow a better understanding of chloroplast function in plants. Generation of a saturated proteome map would not only validate the proteome inventory from its genome sequencing, but also serve as a comprehensive catalogue for future studies. We identified 2451 proteins, encoded by both the nuclear as well as chloroplast genomes, presumably involved in multivariate metabolic processes. The chloroplast deduced proteome and putative chloroplast proteins identified in this study would provide a foundation for future investigation of the expression and function of the chloroplast proteins of chickpea in specific and other crops species in general.
journal_name
J Proteomicsjournal_title
Journal of proteomicsauthors
Lande NV,Subba P,Barua P,Gayen D,Keshava Prasad TS,Chakraborty S,Chakraborty Ndoi
10.1016/j.jprot.2017.06.005subject
Has Abstractpub_date
2017-08-08 00:00:00pages
11-20eissn
1874-3919issn
1876-7737pii
S1874-3919(17)30208-7journal_volume
165pub_type
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