Different Bacterial Communities Involved in Peptide Decomposition between Normoxic and Hypoxic Coastal Waters.

ABSTRACT: Proteins and peptides are key components of the labile dissolved organic matter pool in marine environments. Knowing which types of bacteria metabolize peptides can inform the factors that govern peptide decomposition and further carbon and nitrogen remineralization in marine environments. A ¹³C-labeled tetrapeptide, alanine-valine-phenylalanine-alanine (AVFA), was added to both surface (normoxic) and bottom (hypoxic) seawater from a coastal station in the northern Gulf of Mexico for a 2-day incubation experiment, and bacteria that incorporated the peptide were identified using DNA stable isotope probing (SIP). The decomposition rate of AVFA in the bottom hypoxic seawater (0.018-0.035 μM h^-1) was twice as fast as that in the surface normoxic seawater (0.011-0.017 μM h

SUBMITTER: Liu S 

PROVIDER: S-EPMC5339267 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature