Sulfoquinovosyl diacylglycerol (SQDG) is involved in
the maintenance of photosystem II (PSII) activity in
Chlamydomonas reinhardtii[Minoda, A., Sato, N., Nozaki,
H., Okada, K., Takahashi, H., Sonoike, K. & Tsuzuki, M.
et al.(2002) Eur. J. Biochem.269, 2353–2358]. To under-stand the spread of the taxa in which PSII interacts with
SQDG, especially in cyanobacteria, we produced a mutant
defective in the putativesqdBgene responsible for SQDG
synthesis from two cyanobacteria, Synechocystis sp.