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Extracellular polymeric substances (EPS) play major roles in the efficacy of biofilms such as anaerobic granules, ranging from structural stability to more specific functions. The EPS of three granular anaerobic sludges of different origins were studied and compared. Particularly, the peptides from the protein fraction were identified by mass spectrometry.  Desulfoglaeba  and  Treponema  bacterial genera and  Methanosaeta  and  Methanobacterium  archaeal genera were prominent in all three sludges.  Methanosaeta concilii  proteins were the most represented in EPS of all three sludges studied. Principally, four proteins found in the three sludges, the S-layer protein, the CO-methylating acetyl-CoA synthase, an ABC transporter substrate-binding protein and the methyl-coenzyme M reductase, were expressed by  Methanosaeta concilii . Mainly catabolic enzymes were found from the 45 proteins identified in the protein fraction of EPS. This suggests that EPS may have a role in allowing extracellular catabolic reactions.   Electronic supplementary material  The online version of this article (10.1186/s13568-019-0746-0) contains supplementary material, which is available to authorized users.

Characterization of the protein fraction of the extracellular polymeric substances of three anaerobic granular sludges