Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Construction and characterization of the bacteriophage P4 derivatives whose genome size suitable for packaging into a P2sir3-sized head

P2 sir3-sized head에 packaging 되기 용이한 크기의 박테리오파지 P4 유도체 조성과 정성 연구

  • Kim, Kyoung-Jin (Department of BT-Convergent Pharmaceutical Engineering, College of Health Sciences, Sunmoon University)
  • 김경진 (선문대학교 건강보건대학 BT-융합 제약공학과)
  • Received : 2015.02.26
  • Accepted : 2015.03.16
  • Published : 2015.03.31
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Abstract

The term "P2 sir-associated helper inefficiency" has been used to define the inefficient helper capability of P2 sir mutants for their satellite bacteriophage P4. The aim of this study was to investigate the factors overcoming P2 sir-associated helper inefficiency. At first, we verified whether the P2 cos region containing P4 sid71 cosP2 could overcome P2 sir-associated helper inefficiency with P2 sir3. The result was that P4 sid71 cosP2 could not overcome P2 sir-associated helper inefficiency with P2 sir3. Instead of cos region of P2, the size of the DNA packaged into a $P2_{sir}$-sized head seems to be important for overcoming P2 sir-associated helper inefficiency. In the present work, three kinds of P4 derivatives with packaged DNA sizes between those of P4 ost1 and P4 ost2, were constructed through DNA manipulation. In one P4 derivative, P4 sid71 delRI::apr, the size of the packaged DNA was identified with a CsCl buoyant equilibrium density gradient experiment. According to the burst sizes of the P4 derivatives, they could overcome P2 sir3-associated helper inefficiency. The size of the P4 derivative DNA suitable for packaging into a $P2_{sir3}$-sized head was 28-29 kb.

"P2 sir-관련 도움파지 비효율성"이라는 용어는 P2 sir 변이체가 그들의 위성 박테리오파지인 P4에 대해 도움파지 역할을 충분히 못하는 것을 가리키는 용어이다. 이 연구의 목적은 이러한 P2 sir-관련 도움파지 비효율성을 극복하는 요인들을 조사하는 것이다. 우선 P2의 cos 영역을 함유하는 P4 sid71 cosP2가 P2 sir3의 도움파지 비효율성을 극복하는지를 조사하였다. 그 결과 P4 sid71 cosP2는 P2 sir3의 도움파지 비효율성을 극복하지 못하였다. P2의 cos 영역 대신에 $P2_{sir}$-sized head에 packaging되는 DNA 크기가 도움파지 비효율성을 극복하는 중요한 요인으로 나타났다. 이 연구에서는, DNA 조작을 통해 packaging 되는 DNA 크기가 P4 ost1과 P4 ost2 사이가 되는 세 종류의 P4 유도체를 조성하였다. 그 중 하나인 P4 sid71 delRI::apr의 CsCl 균등밀도차실험을 거쳐 packaging되는 DNA의 크기를 확인하였다. P4 유도체들의 후손방출량 실험에 따르면 그들은 모두 P2sir3-관련 도움파지 비효율성을 극복하였다. $P2_{sir3}$-sized head에 잘 packaging되는 P4 유도체의 크기는 28-29 kb로 나타났다.

Keywords

References

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