3b9o
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(New page: 200px<br /><applet load="3b9o" size="350" color="white" frame="true" align="right" spinBox="true" caption="3b9o, resolution 1.9Å" /> '''long-chain alkane mon...)
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Revision as of 09:11, 23 January 2008
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long-chain alkane monooxygenase (LadA) in complex with coenzyme FMN
Overview
LadA, a long-chain alkane monooxygenase, utilizes a terminal oxidation, pathway for the conversion of long-chain alkanes (up to at least C(36)) to, corresponding primary alcohols in thermophilic bacillus Geobacillus, thermodenitrificans NG80-2. Here, we report the first structure of the, long-chain alkane hydroxylase, LadA, and its complex with the flavin, mononucleotide (FMN) coenzyme. LadA is characterized as a new member of, the SsuD subfamily of the bacterial luciferase family via a surprising, structural relationship. The LadA:FMN binary complex structure and a, LadA:FMN:alkane model reveal a hydrophobic cavity that has dual roles: to, provide a hydrogen-bond donor (His138) for catalysis and to create a, solvent-free environment in which to stabilize the C4a-hydroperoxyflavin, intermediate. Consequently, LadA should catalyze the conversion of, long-chain alkanes via the acknowledged flavoprotein monooxygenase, mechanism. This finding suggests that the ability of LadA to catalyze the, degradation of long-chain alkanes is determined by the binding mode of the, long-chain alkane substrates. The LadA structure opens a rational, perspective to explore and alter the substrate binding site of LadA, with, potential biotechnological applications in areas such as petroleum, exploration and treatment of environmental oil pollution.
About this Structure
3B9O is a Single protein structure of sequence from Geobacillus thermodenitrificans with as ligand. Full crystallographic information is available from OCA.
Reference
Crystal Structure of Long-Chain Alkane Monooxygenase (LadA) in Complex with Coenzyme FMN: Unveiling the Long-Chain Alkane Hydroxylase., Li L, Liu X, Yang W, Xu F, Wang W, Feng L, Bartlam M, Wang L, Rao Z, J Mol Biol. 2007 Nov 28;. PMID:18164311
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