Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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A Functional Analysis of OsCPK11, a Calcium-dependent Protein Kinase (CDPK) Gene in Rice

벼의 칼슘-의존성 단백질 카이네즈 유전자인 OsCPK11의 기능적 분석

  • Lee, Su-Hee (Iwol Middle School) ;
  • Lee, Jeong-Eun (Keoje Girls' Middle School) ;
  • Day, Philip (Department of Mathmatics and Natural Sciences, Penn State Altoona) ;
  • Gilroy, Simon (Department of Botany, University of Wisconsin-Madison) ;
  • Kim, Sung-Ha (Department of Biology Education, Korea National University of Education)
  • Received : 2016.09.19
  • Accepted : 2017.10.31
  • Published : 2017.11.30
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Abstract

CDPKs have pivotal roles in plant $Ca^{2+}$-mediated transduction signaling. A total of 29 CDPK genes have been identified in rice (Oryza sativa L.), but their key functions have not been completely noted. This study focused on the OsCPK11 gene, which has not been studied, to determine its functional characteristics. A study of tissue-specific expressions revealed that the OsCPK11 gene is expressed in young leaves, mature leaves and flowers of rice. An expression of the gene was also confirmed in gibberellin-treated aleurone layers of rice. Regarding the phenotypic characteristics of Tos17-inserted OsCPK11 mutants, the heights of the mutants were not distinguishable from the heights of wild type plants, but the number of caryopses and the caryopses' weights were significantly statistically different. In addition, many grains of the mutants had white belly materials in their endosperm. The cDNA of the OsCPK11 was cloned, and an OsCPK11 protein of about 60.5 kD was obtained by using a GST affinity chromatography and an SDS-PAGE. An analysis of the amino-acid sequence of the protein indicated that the OsCPK11 protein has the structural characteristics of typical CDPKs. The results provided useful information about the functions of the OsCPK11 gene and further noted the roles CDPKs have in $Ca^{2+}$-mediated signaling in plants.

Calcium-dependent protein kinases (CDPKs)는 칼슘 이온을 매개로 한 신호전달 경로에서 중요한 역할을 한다. 벼(Oryza sativa)에는 29개의 CDPKs가 확인되었지만 그들의 기능은 완벽히 밝혀지지 않았다. 이 연구는 OsCPK11 유전자에 초점을 맞춰 그것의 기능적인 특징을 조사하였다. 벼의 어린 잎, 성장한 잎, 꽃에서 OsCPK11 유전자의 조직-특이적 발현이 확인되었고, 지베렐린이 처리된 벼의 호분층에서도 이 유전자의 발현을 확인할 수 있었다. Tos-17이 삽입된 oscpk11의 표현형에서 돌연변이체 각각의 키는 야생형과 구분되지 않았지만, 영과의 수나 무게는 통계적으로 유의미한 차이가 있었다. 덧붙여 많은 돌연변이체 낟알의 배젖에서 white belly materials이 확인되었다. OsCPK11의 cDNA가 cloning되었고, 약 60.5 kD인 OsCPK11 단백질이 GST affinity chromatography와 SDS-PAGE에 의해 얻어졌다. 아미노산 서열 분석을 통해 OsCPK11이 전형적인 CDPKs의 구조적 특징을 가짐을 알 수 있었다. 이 결과는 OsCPK11유전자의 기능과 식물에서 칼슘 이온을 매개로 한 신호전달 경로에 CDPK 역할의 유용한 정보를 제공해줄 것이다.

Keywords

References

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