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Structural Organization of the Regulatory Domain of Human 5- Lipoxygenase

[ Vol. 6 , Issue. 2 ]


John B. Allard and Thomas G. Brock   Pages 125 - 131 ( 7 )


The enzyme 5-lipoxygenase (5-LO) initiates the synthesis of leukotrienes. For this reason, 5-LO activity is important for immune defense, whereas improper regulation contributes to pathogenesis, including chronic inflammation, asthma and atherosclerosis. Like all lipoxygenases, the 5-LO protein consists of two domains, a regulatory domain and a catalytic domain. Naturally, the regulatory domain determines catalytic activity and controls leukotriene synthesis. This domain shares features with classical C2 domains in that it has a β-sandwich structure and binds calcium, nucleotides and phospholipids. However, important structural features place this domain in a distinct family, the PLATs (for Polycystin-1, Lipoxygenase, α-Toxin). In this review, we summarize our current understanding of the three dimensional organization of this important component of the 5-LO molecule. In addition, we point to findings from structural analyses of related proteins to suggest further details relating 5-LO structure to function.


5-lipoxygenase, structure, c2 domain, toxin, lipase, protein kinase c, sandwich, plat domain


6301 MSRB III, Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109-0642, USA.

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