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9.B.73 The Chloroplast Envelope/Cyanobacterial Membrane Protein (CemA) Family

The CemA family may be involved in H+ extrusion and thereby indirectly promote HCO3- or CO2 uptake into chloroplasts (Rolland et al., 1997). Ycf10 of C. reinhardtii resembles CotA of the cyanobacterium. Synechocystis (440 aas) involved to CO2 uptake and H+ extrusion. It shows limited sequence similarity with CorC (9.B.37.2.1). Both proteins exhibit 4 or 5 putative TMSs, but CorC has them at the N-terminus of a 410 aa protein while Ycf10 has 3 at its C-terminus.

References associated with 9.B.73 family:

Katoh, A., K.S. Lee, H. Fukuzawa, K. Ohyama, and T. Ogawa. (1996). cemA homologue essential to CO2 transport in the cyanobacterium Synechocystis PCC6803. Proc. Natl. Acad. Sci. USA 93: 4006-4010. 8633006
Rolland, N., A.J. Dorne, G. Amoroso, D.F. Sultemeyer, J. Joyard, and J.D. Rochaix. (1997). Disruption of the plastid ycf10 open reading frame affects uptake of inorganic carbon in the chloroplast of Chlamydomonas. EMBO J. 16: 6713-6726. 9362486