TY  - JOUR
A1  - Cencil, Ugo
A1  - Nitschke, Felix
A1  - Steup, Martin
A1  - Minassian, Berge A.
A1  - Colleoni, Christophe
A1  - Ball, Steven G.
T1  - Transition from glycogen to starch metabolism in Archaeplastida
JF  - Trends in plant science
N2  - In this opinion article we propose a scenario detailing how two crucial components have evolved simultaneously to ensure the transition of glycogen to starch in the cytosol of the Archaeplastida last common ancestor: (i) the recruitment of an enzyme from intracellular Chlamydiae pathogens to facilitate crystallization of alpha-glucan chains; and (ii) the evolution of novel types of polysaccharide (de)phosphorylating enzymes from preexisting glycogen (de)phosphorylation host pathways to allow the turnover of such crystals. We speculate that the transition to starch benefitted Archaeplastida in three ways: more carbon could be packed into osmotically inert material; the host could resume control of carbon assimilation from the chlamydial pathogen that triggered plastid endosymbiosis; and cyanobacterial photosynthate export could be integrated in the emerging Archaeplastida.
KW  - evolution of plastids
KW  - starch and glycogen metabolism
KW  - polyglucan debranching reactions
KW  - starch and glycogen (de)phosphorylation
KW  - Chlamydia-like bacteria
KW  - Lafora disease
Y1  - 2014
U6  - https://doi.org/10.1016/j.tplants.2013.08.004
SN  - 1360-1385
VL  - 19
IS  - 1
SP  - 18
EP  - 28
PB  - Elsevier
CY  - London
ER  -