Branched-chain amino acid assimilation enables mixotrophy of ammonia-oxidizing archaeal sponge symbionts
Marine sponges and ammonia-oxidizing archaea (AOA) represent one of the earliest animal-microbe symbioses. AOA are considered metabolically constrained chemolithoautotrophs that remove nitrogenous waste within the sponge holobiont. Here, we expand this view by demonstrating that symbiotic AOA assimilate branched-chain...