Ca2+-dependent cell aggregation of halophilic archaeon, Halobacterium salinarum

Halobacterium salinarum CCM 2090 exhibits a Ca2+-dependent cellular aggregation system. This process is caused by the interaction between Ca2+ and aggregation factor(s). Although the aggregates formed are encased in matrix-like substances, such as bacterial biofilms, they are not attached to the abiotic substratum. Therefore, these substances may be distinguished from typical biofilms.