Identification of a phosphinothricin-resistant mutant of rice glutamine synthetase using DNA shuffling.

Abstract:

:To date, only bar/pat gene derived from Streptomyces has been used to generate the commercial PPT-resistant crops currently available in the market. The limited source of bar/pat gene is probably what has caused the decrease in PPT-tolerance, which has become the main concern of those involved in field management programs. Although glutamine synthetase (GS) is the target enzyme of PPT, little study has been reported about engineering PPT-resistant plants with GS gene. Then, the plant-optimized GS gene from Oryza sativa (OsGS1S) was chemically synthesized in the present study by PTDS to identify a GS gene for developing PPT-tolerant plants. However, OsGS1S cannot be directly used for developing PPT-tolerant plants because of its poor PPT-resistance. Thus, we performed DNA shuffling on OsGS1S, and one highly PPT-resistant mutant with mutations in four amino acids (A63E, V193A, T293A and R295K) was isolated after three rounds of DNA shuffling and screening. Among the four amino acids substitutions, only R295K was identified as essential in altering PPT resistance. The R295K mutation has also never been previously reported as an important residue for PPT resistance. Furthermore, the mutant gene has been transformed into Saccharomyces cerevisiae and Arabidopsis to confirm its potential in developing PPT-resistant crops.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Tian YS,Xu J,Zhao W,Xing XJ,Fu XY,Peng RH,Yao QH

doi

10.1038/srep15495

subject

Has Abstract

pub_date

2015-10-23 00:00:00

pages

15495

issn

2045-2322

pii

srep15495

journal_volume

5

pub_type

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