The Magnetosome Protein, Mms6 from Magnetospirillum magneticum Strain AMB-1, Is a Lipid-Activated Ferric Reductase

Singappuli-Arachchige, Dilini; Feng, Shuren; Wang, Lijun; Palo, Pierre E.; Shobade, Samuel O.; Thomas, Michelle; Nilsen-Hamilton, Marit

doi:10.3390/ijms231810305

The Magnetosome Protein, Mms6 from Magnetospirillum magneticum Strain AMB-1, Is a Lipid-Activated Ferric Reductase

Journal Article · Wed Sep 07 00:00:00 EDT 2022 · International Journal of Molecular Sciences (Online)

DOI:https://doi.org/10.3390/ijms231810305· OSTI ID:1886104

; ; Wang, Lijun; Palo, Pierre E.; ; Thomas, Michelle;

Magnetosomes of magnetotactic bacteria consist of magnetic nanocrystals with defined morphologies enclosed in vesicles originated from cytoplasmic membrane invaginations. Although many proteins are involved in creating magnetosomes, a single magnetosome protein, Mms6 from Magnetospirillum magneticum strain AMB-1, can direct the crystallization of magnetite nanoparticles in vitro. The in vivo role of Mms6 in magnetosome formation is debated, and the observation that Mms6 binds Fe3+ more tightly than Fe2+ raises the question of how, in a magnetosome environment dominated by Fe3+, Mms6 promotes the crystallization of magnetite, which contains both Fe3+ and Fe2+. Here we show that Mms6 is a ferric reductase that reduces Fe3+ to Fe2+ using NADH and FAD as electron donor and cofactor, respectively. Reductase activity is elevated when Mms6 is integrated into either liposomes or bicelles. Analysis of Mms6 mutants suggests that the C-terminal domain binds iron and the N-terminal domain contains the catalytic site. Although Mms6 forms multimers that involve C-terminal and N-terminal domain interactions, a fusion protein with ubiquitin remains a monomer and displays reductase activity, which suggests that the catalytic site is fully in the monomer. However, the quaternary structure of Mms6 appears to alter the iron binding characteristics of the C-terminal domain. These results are consistent with a hypothesis that Mms6, a membrane protein, promotes the formation of magnetite in vivo by a mechanism that involves reducing iron.

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Sponsoring Organization:: USDOE

OSTI ID:: 1886104

Alternate ID(s):: OSTI ID: 1890188

Journal Information:: International Journal of Molecular Sciences (Online), Journal Name: International Journal of Molecular Sciences (Online) Journal Issue: 18 Vol. 23; ISSN IJMCFK; ISSN 1422-0067

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Switzerland

Language:: English

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