title: Extracellular proteins limit the dispersal of biogenic nanoparticles.
abstract: High-spatial-resolution secondary ion microprobe spectrometry, synchrotron radiation-based Fourier-transform infrared spectroscopy, and polyacrylamide gel analysis demonstrated the intimate association of proteins with spheroidal aggregates of biogenic zinc sulfide nanocrystals, an example of extracellular biomineralization. Experiments involving synthetic zinc sulfide nanoparticles and representative amino acids indicated a driving role for cysteine in rapid nanoparticle aggregation. These findings suggest that microbially derived extracellular proteins can limit the dispersal of nanoparticulate metal-bearing phases, such as the mineral products of bioremediation, that may otherwise be transported away from their source by subsurface fluid flow.
authors.affiliation: Department of Earth and Planetary Science, University of California Berkeley, Berkeley, CA 94720, USA. jwmoreau@usgs.gov
authors.forename: John W
authors.initials: JW
authors.lastname: Moreau
authors.forename: Peter K
authors.initials: PK
authors.lastname: Weber
authors.forename: Michael C
authors.initials: MC
authors.lastname: Martin
authors.forename: Benjamin
authors.initials: B
authors.lastname: Gilbert
authors.forename: Ian D
authors.initials: ID
authors.lastname: Hutcheon
authors.forename: Jillian F
authors.initials: JF
authors.lastname: Banfield
mesh_terms: D000596:Amino Acids / Q000737:chemistry; D001419:Bacteria / Q000737:chemistry / Q000378:metabolism; D001426:Bacterial Proteins / Q000737:chemistry* / Q000378:metabolism; D018441:Biofilms; D011232:Chemical Precipitation; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles; D009584:Nitrogen / Q000032:analysis; D010084:Oxidation-Reduction; D010316:Particle Size; D018629:Spectrometry, Mass, Secondary Ion; D017550:Spectroscopy, Fourier Transform Infrared; D013440:Sulfides / Q000737:chemistry; D017967:Zinc Compounds / Q000737:chemistry
chemical_list: D000596:Amino Acids; D001426:Bacterial Proteins; D013440:Sulfides; D017967:Zinc Compounds; C031238:zinc sulfide; D009584:Nitrogen