Surface Mn(II) oxidation actuated by a multicopper oxidase in a soil bacterium leads to the formation of manganese oxide minerals.
Surface Mn(II) oxidation actuated by a multicopper oxidase in a soil bacterium leads to the formation of manganese oxide minerals.
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由土壤细菌中的多铜氧化酶驱动的表面 Mn(II) 氧化导致氧化锰矿物的形成
DOI:
10.1038/srep10895
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发表时间:
2015-06-03
影响因子:
4.6
通讯作者:
Li L
中科院分区:
文献类型:
--
作者:
Zhang Z;Zhang Z;Chen H;Liu J;Liu C;Ni H;Zhao C;Ali M;Liu F;Li L
In this manuscript, we report that a bacterial multicopper oxidase (MCO266) catalyzes Mn(II) oxidation on the cell surface, resulting in the surface deposition of Mn(III) and Mn(IV) oxides and the gradual formation of bulky oxide aggregates. These aggregates serve as nucleation centers for the formation of Mn oxide micronodules and Mn-rich sediments. A soil-borne Escherichia coli with high Mn(II)-oxidizing activity formed Mn(III)/Mn(IV) oxide deposit layers and aggregates under laboratory culture conditions. We engineered MCO266 onto the cell surfaces of both an activity-negative recipient and wild-type strains. The results confirmed that MCO266 governs Mn(II) oxidation and initiates the formation of deposits and aggregates. By contrast, a cell-free substrate, heat-killed strains and intracellularly expressed or purified MCO266 failed to catalyze Mn(II) oxidation. However, purified MCO266 exhibited Mn(II)-oxidizing activity when combined with cell outer membrane component (COMC) fractions in vitro. We demonstrated that Mn(II) oxidation and aggregate formation occurred through an oxygen-dependent biotic transformation process that requires a certain minimum Mn(II) concentration. We propose an approximate electron transfer pathway in which MCO266 transfers only one electron to convert Mn(II) to Mn(III) and then cooperates with other COMC electron transporters to transfer the other electron required to oxidize Mn(III) to Mn(IV).
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影响因子:
5.6
作者:
Kataoka, Kunishige;Komori, Hirofumi;Sakurai, Takeshi
通讯作者:
Sakurai, Takeshi
影响因子:
5
作者:
Dick, Gregory J.;Clement, Brian G.;Tebo, Bradley M.
通讯作者:
Tebo, Bradley M.
影响因子:
3.8
作者:
Li, L;Kang, DG;Cha, HJ
通讯作者:
Cha, HJ
DOI:
10.1007/bf01611203
发表时间:
1973-01-01
期刊:
HELGOLANDER WISSENSCHAFTLICHE MEERESUNTERSUCHUNGEN
影响因子:
--
作者:
KRUMBEIN, WE;ALTMANN, HJ
通讯作者:
ALTMANN, HJ
影响因子:
2.8
作者:
Johnson, Hope A.;Tebo, Bradley M.
通讯作者:
Tebo, Bradley M.