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Collagens from marine animals are an important component of marine organic nitrogen. Collagenase-producing bacteria and their collagenases play important roles in collagen degradation and organic nitrogen recycling in the ocean. However, only a few collagenase-producing marine bacteria have been so far discovered. Here, we reported the isolation and characterization of a collagenase-secreting bacterium, designated strain SM1988 T , isolated from a green alga  Codium fragile  sample. Strain SM1988 T  is a Gram-negative, aerobic, oxidase-, and catalase-positive, unipolar flagellated, and rod-shaped bacterium capable of hydrolyzing casein, gelatin and collagens. Phylogenetic analysis revealed that strain SM1988 T  formed a distinct phylogenetic lineage along with known genera within the family  Pseudoalteromonadaceae , with 16S rRNA gene sequence similarity being less than 93.3% to all known species in the family. Based on the phylogenetic, genomic, chemotaxonomic and phenotypic data, strain SM1988 T  was considered to represent a novel species in a novel genus in the family  Pseudoalteromonadaceae , for which the name  Flocculibacter collagenilyticus  gen. nov., sp. nov. is proposed, with the type strain being SM1988 T  (= MCCC 1K04279 T  = KCTC 72761 T ). Strain SM1988 T  showed a high production of extracellular collagenases, which had high activity against both bovine collagen and codfish collagen. Biochemical tests combined with genome and secretome analyses indicated that the collagenases secreted by strain SM1988 T  are serine proteases from the MEROPS S8 family. These data suggest that strain SM1988 T  acts as an important player in marine collagen degradation and recycling and may have a promising potential in collagen resource utilization.

frontiers in microbiology

Taxonomic and Enzymatic Characterization of Flocculibacter collagenilyticus gen. nov., sp. nov., a Novel Gammaproteobacterium With High Collagenase Production