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-Structure paper
タイトル | Molecular basis for metabolite channeling in a ring opening enzyme of the phenylacetate degradation pathway. |
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ジャーナル・号・ページ | Nat Commun, Vol. 10, Issue 1, Page 4127, Year 2019 |
掲載日 | 2019年9月11日 |
著者 | Nitish Sathyanarayanan / Giuseppe Cannone / Lokesh Gakhar / Nainesh Katagihallimath / Ramanathan Sowdhamini / Subramanian Ramaswamy / Kutti R Vinothkumar / |
PubMed 要旨 | Substrate channeling is a mechanism for the internal transfer of hydrophobic, unstable or toxic intermediates from the active site of one enzyme to another. Such transfer has previously been ...Substrate channeling is a mechanism for the internal transfer of hydrophobic, unstable or toxic intermediates from the active site of one enzyme to another. Such transfer has previously been described to be mediated by a hydrophobic tunnel, the use of electrostatic highways or pivoting and by conformational changes. The enzyme PaaZ is used by many bacteria to degrade environmental pollutants. PaaZ is a bifunctional enzyme that catalyzes the ring opening of oxepin-CoA and converts it to 3-oxo-5,6-dehydrosuberyl-CoA. Here we report the structures of PaaZ determined by electron cryomicroscopy with and without bound ligands. The structures reveal that three domain-swapped dimers of the enzyme form a trilobed structure. A combination of small-angle X-ray scattering (SAXS), computational studies, mutagenesis and microbial growth experiments suggests that the key intermediate is transferred from one active site to the other by a mechanism of electrostatic pivoting of the CoA moiety, mediated by a set of conserved positively charged residues. |
リンク | Nat Commun / PubMed:31511507 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.9 - 3.3 Å |
構造データ | |
化合物 | ChemComp-NDP: ChemComp-NAP: ChemComp-CO8: ChemComp-COO: |
由来 |
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キーワード | HYDROLASE / substrate channeling / bi-functional enzyme / dehydrogenase |