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Improved methods for total and chloroplast protein extraction from Cajanus species for two-dimensional gel electrophoresis and mass spectrometry.

Authors :
S., Arunima
Das, Alakesh
Kalita, Prakash Jyoti
Patil, Rahul Ishwar
Pandey, Neha
Bhattacharjee, Mamta
Sharma, Bidyut Kumar
Das, Debajit
Acharjee, Sumita
Source :
PLoS ONE. 8/15/2024, Vol. 19 Issue 8, p1-18. 18p.
Publication Year :
2024

Abstract

The recent advances in pigeon pea genomics, including high-quality whole genome and chloroplast genome sequence information helped develop improved varieties. However, a comprehensive Cajanus proteome, including the organelle proteome, is yet to be fully mapped. The spatial delineation of pigeon pea proteins at sub-cellular levels and inter-organelle communication could offer valuable insights into its defense mechanism against various stresses. However, the major bottleneck in the proteomic study is the lack of a suitable method of protein extraction and sample preparation compatible with two-dimensional gel electrophoresis (2D-PAGE), liquid chromatography-mass spectrometry (LCMS), or matrix-assisted laser desorption ionization-time of flight (MALDi-ToF). Our study introduces two efficient methods, one for isolating total proteins and another for organelle (chloroplast) proteins from various Cajanus spp. For total protein extraction, we have optimized a protocol using phenol in combination with a reducing agent (DTT) and protease inhibitor cocktail, also washing (6–7 times) with ice-cold acetone after overnight protein precipitation of total proteins. Our modified extraction method using phenol for total leaf protein yielded approximately 2-fold more proteins than the previously reported protocols from C. cajan (3.18 ± 0.11 mg/gm) and C. scarabaeoides (2.06 ± 0.08 mg/gm). We have also optimized a protocol for plastid protein extraction, which yielded 1.33 ± 0.25 mg/10 gm plastid proteins from C. cajan and 0.88 ± 0.19 mg/10 gm plastid proteins from C. scarabaeoides. The 2D-PAGE analysis revealed 678 ± 08 reproducible total protein spots from C. cajan and 597 ± 22 protein spots from C. scarabaeoides. Similarly, we found 566 ± 10 and 486 ± 14 reproducible chloroplast protein spots in C. cajan and C. scarabaeoides, respectively. We confirmed the plastid protein fractions through immunoblot analysis using antibodies against LHCb1/LHCⅡ type Ⅰ protein. We found both methods suitable for 2D-PAGE and mass spectrometry (MS). This is the first report on developing protocols for total and chloroplastic protein extraction of Cajanus spp. suitable for advanced proteomics research. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
19326203
Volume :
19
Issue :
8
Database :
Academic Search Index
Journal :
PLoS ONE
Publication Type :
Academic Journal
Accession number :
179043020
Full Text :
https://doi.org/10.1371/journal.pone.0308909