Endohydrolysis of (1->4)-beta-linkages in the backbone of lambda-carrageenan, resulting in the tetrasaccharide alpha-D-Galp2,6S2-(1->3)-beta-D-Galp2S-(1->4)-alpha-D-Galp2,6S2-(1->3)-D-Galp2S
Comment
The enzyme from Pseudoalteromonas sp. is specific for lambda-carrageenan. iota-Carrageenan (see EC 3.2.1.157, iota-carrageenase), kappa-carrageenan (see EC 3.2.1.83, kappa-carrageenase), agarose and porphyran are not substrates.