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. 2019 Nov 20;67(50):13969–13977. doi: 10.1021/acs.jafc.9b05968

Figure 5.

Figure 5

Catabolic routes identified in Bifidobacterium and LAB to degrade β-galactooligosaccharide compounds from pGOS. Lactobacillus strains employ genes of (i) LacEF/LacG pathway to utilize mostly pGOS compounds with a similar structure to lactose (labelled as fraction “1”) or (ii) LacS/LacZ pathway to utilize mostly DP2 compounds of pGOS and certain DP3 compounds (labelled as fraction 1 and 2, respectively). Bifidobacterial strains employ (i) also the LacS/LacZ pathway to utilize DP2 compounds from pGOS and in addition (ii) GosDEC/GosG and/or the GalA/GalCDE/GalG pathway(s) to utilize GOS compounds with a higher DP.