Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Adenylyl Cyclases in Mycobacteria

마이코박테리아의 adenylyl cyclase

  • 전한승 (부산대학교 미생물학과) ;
  • 고인정 (KAIST 부설 한국과학영재학교) ;
  • 오정일 (부산대학교 미생물학과)
  • Received : 2011.02.17
  • Accepted : 2011.03.20
  • Published : 2011.03.30
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Abstract

Adenylyl cyclase (AC) catalyzes the formation of cyclic AMP (cAMP) from ATP. The cAMP produced by AC serves as a secondary messenger in a variety of signal transduction pathways, and controls various cellular functions in many organisms. ACs can be grouped into six classes based on their primary amino acid sequences. Eukaryotes and mycobacteria contain only members of class III AC. The catalytic cyclase domains of class III AC are active as dimers: mammalian ACs, which are composed of a single polypeptide with two catalytic cyclase domains, form the active site as a result of intramolecular dimerization of the catalytic cyclase domains. In contrast, mycobacterial ACs function as homodimers, since their polypeptides contain a single catalytic cyclase domain. Six amino acids are required for the catalytic activity of class III AC - two aspartate residues, a lysine-aspartate pair and an arginine-asparagine pair. 16 ACs belonging to the class III were identified in Mycobacterium tuberculosis H37Rv, and their characteristics are reviewed.

Adenylyl cyclase (AC)는 ATP로부터 cAMP를 형성하는 반응을 촉매한다. AC에 의해 생산된 cAMP는 다양한 신호전달 경로에서 이차전달자로 사용되고 많은 종에서 다양한 세포기능을 조절한다. AC는 1차구조에 따라 6개의 그룹으로 나눌 수 있다. 진핵생물과 Mycobacterium 속에 속하는 세균에서는 class III에 속하는 AC만이 발견된다. Class III에 속하는 AC의 경우 catalytic cyclase 도메인이 dimer를 형성해야만 활성부위가 형성되고 활성을 가지게 된다. 포유류의 AC는 하나의 polypeptide에 2개의 catalytic cyclase 도메인을 가지고 있고, 이 두 개의 도메인이 intramolecular dimerization을 통해서 활성부위를 형성한다. 반면에 mycobacteria의 AC는 polypeptide에 한 개의 catalytic cyclase 도메인을 가지고 있고, homodimer의 4차구조를 형성하여 활성을 가지게 된다. Class III AC의 활성을 위해서 필요한 6개의 아미노산 잔기가 활성부위에 잘 보존되어 있다. 이 6개의 아미노산 잔기는 $Mg^{2+}$과 결합을 하는 2개의 aspartate 잔기쌍, 기질특이성을 부여하는 lysine-aspartate 잔기쌍, 그리고 반응 전이상태를 안정화시키는 arginine-asparagine 잔기쌍들로 이루어져 있다. Mycobacterium tuberculosis H37Rv에서는 16개의 AC 유전자가 발견되었으며, 이 AC의 연구된 특성에 대해 본 총설에서 다룰 것이다.

Keywords

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