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The maize brevis plant1 is a type II inositol polyphosphate 5-phosphatase

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Abstract

The genes associated with the dwarf phenotype have been utilized in crop breeding to prevent lodging and stem breakage. Brevis plant1 (Bv1), encoding a putative inositol polyphosphate 5-phosphatase (5PTase), has been associated with stem elongation in maize (Zea mays L.); however, the enzymatic activity of BV1 has not been experimentally characterized. In this study, the phosphatase activity of BV1 was verified with biochemical assays. BV1 demonstrated type II 5PTase activity capable of hydrolyzing both inositol polyphosphates and phosphoinositides. Similar to other type II 5PTases that share similar sequences and common domain architecture with BV1, the enzymatic activity of BV1 is sensitive to changes in Mg2+ and pH. 367G-R and 565S-L are two mutations in Bv1 that have been associated with the dwarfing phenotype in maize. To characterize the dwarfing mechanism, mutant BV1 proteins were expressed in vitro and assayed for phosphatase activity. The results showed that both mutations significantly reduced the enzymatic activity of BV1, but neither altered its substrate specificity and dependence on Mg2+ and pH. This biochemical verification of BV1 as a type II 5PTase is important as it sheds light on the molecular basis of deficient BV1-mediated dwarfing phenotype.

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Abbreviations

Bv1 :

Brevis plant1

5PTase:

Inositol polyphosphate 5-phosphatase

ZZ:

Protein-A immunoglobulin G (IgG) binding domains

TEV:

Tobacco etch virus

PCR:

Polymerase chain reaction

qPCR:

Quantitative polymerase chain reaction

RT:

Reverse transcription

β-Tub :

Tubulin beta

BLAST:

Basic Local Alignment Search Tool

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Author notes

  1. Yu Chen and Qinan Cai have contributed equally to this work.

Authors and Affiliations

  1. Department of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China

    Yu Chen

  2. Agro-Biotechnology Research Institute, Jilin Academy of Agricultural Sciences, Changchun, 130124, China

    Qinan Cai

  3. Department of Agricultural Sciences, Hetao College, Bayannur City, 015000, China

    Shuiyuan Hao

Authors
  1. Yu Chen
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  2. Qinan Cai
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  3. Shuiyuan Hao
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Correspondence to Shuiyuan Hao.

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Chen, Y., Cai, Q. & Hao, S. The maize brevis plant1 is a type II inositol polyphosphate 5-phosphatase. J. Plant Biochem. Biotechnol. 27, 215–222 (2018). https://doi.org/10.1007/s13562-017-0433-7

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  • DOI: https://doi.org/10.1007/s13562-017-0433-7

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