Probable sulfoquinovose biosynthesis pathway in S. acidocaldarius.
A. Proposed biosynthetic pathway of the UDP-sulfoquinovose in S. acidocaldarius. R1, GlcNAc-P-Dol; UTP, uridine triphosphate; agl2 encoding for an UDP-glucose pyrophosphorylase; agl3 coding for an UDP-sulfoquinovose synthase; agl1 coding for a membrane bound glucosyltransferase. Biosynthetic pathway in agreement with (Shimojima, 2011).
B. Physical map of the gene region of S. acidocaldarius, in which the gene coding for UDP-sulfoquinovose synthase is located. Illustrated are the genes Saci0420 until Saci0428. The red displayed gene encodes the UDP-sulfoquinovose synthase. The genes Saci0421 und Saci0422 are most likely also involved in the biosynthesis of sulfoquinovose (see A).