4.7 Article

Identification and validation of rice reference proteins for western blotting

Journal

JOURNAL OF EXPERIMENTAL BOTANY
Volume 62, Issue 14, Pages 4763-4772

Publisher

OXFORD UNIV PRESS
DOI: 10.1093/jxb/err084

Keywords

Antibody-based proteomics; rice (Oryza sativa L; ); reference gene; reference protein; western blotting

Categories

Funding

  1. National Natural Sciences Foundation of China [30670175, 30730007]
  2. 973 projects [2007CB109201, 2006CB910105]

Ask authors/readers for more resources

Studies of rice protein expression have increased considerably with the development of rice functional genomics. In order to obtain reliable expression results in western blotting, information on appropriate reference proteins is necessary for data normalization. To date, no published study has identified and systematically validated reference proteins suitable for the investigation of rice protein expression. In this study, nine candidate proteins were selected and their specific antibodies were obtained through immunization of rabbits with either recombinant proteins expressed in Escherichia coli or synthesized peptides. Western blotting was carried out to detect the expression of target proteins in a set of 10 rice samples representing different rice tissues/organs at different developmental stages. The expression stability of the proteins was analysed using geNorm and Microcal Origin 6.0 software. The results indicated that heat shock protein (HSP) and elongation factor 1-alpha (eEF-1 alpha) were the most constantly expressed among all rice proteins tested throughout all developmental stages, while the proteins encoded by conventional internal reference genes fluctuated in amount. Comparison among the profiling of translation and transcription [expressed sequence tags (EST) and massively parallel signature sequencing (MPSS)] revealed that a correlation existed. Based on the standard curves derived from the antigen-antibody reaction, the concentrations of HSP and eEF-1 alpha proteins in rice leaves were similar to 0.12%. Under the present experimental conditions, the lower limits of detection for HSP and eEF-1 alpha proteins in rice were 0.24 ng and 0.06 ng, respectively. In conclusion, the reference proteins selected in this study, and the corresponding antibodies, can be used in qualitative and quantitative analysis of rice proteins.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available