Enzyme-Assisted Preparation of Furcellaran-Like κ-/β-Carrageenan
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Carrageenans are sulfated galactans that are widely used in industrial applications for their thickening and gelling properties, which vary according to the amount and distribution of ester sulfate groups along the galactan backbone. To determine and direct the sulfation of κ-carrageenan moieties, we purified an endo-κ-carrageenan sulfatase (Q15XH1 accession in UniprotKB) from Pseudoalteromonas atlantica T6c extracts. Based on sequence analyses and exploration of the genomic environment of Q15XH1, we discovered and characterized a second endo-κ-carrageenan sulfatase (Q15XG7 accession in UniprotKB). Both enzymes convert κ-carrageenan into a hybrid, furcellaran-like κ-/β-carrageenan. We compared the protein sequences of these two new κ-carrageenan sulfatases and that of a previously reported ι-carrageenan sulfatase with other predicted sulfatases in the P. atlantica genome, revealing the existence of additional new carrageenan sulfatases.
KeywordsCarrageenan Sulfatase Biotransformation Pseudoalteromonas atlantica
The research leading to these results received funding from the European Community Seventh Framework Programme (FP7) under grant agreement no. 222628. Mass spectrometry analyses were conducted at the BIBS facility at the INRA Biopolymers Interaction Assemblies research unit (www.bibs.inra.fr). We thank Mathilde Joint for her excellent technical assistance in LC-MS/MS. Special thanks to Nelly Kervarec from the “University of Bretagne Occidentale” for her expertise in the NMR analyses.
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