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Homologs of PROTEIN TARGETING TO STARCH Control Starch Granule Initiation in Arabidopsis Leaves.

Plant Cell. 2017; 
Seung David,Boudet Julien,Monroe Jonathan,Schreier Tina B,David Laure C,Abt Melanie,Lu Kuan-Jen,Zanella Martina,Zeeman Samu
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摘要

The molecular mechanism that initiates the synthesis of starch granules is poorly understood. Here, we discovered two plastidial proteins involved in granule initiation in leaves. Both contain coiled coils and a family-48 carbohydrate binding module (CBM48) and are homologs of the PROTEIN TARGETING TO STARCH (PTST) protein; thus, we named them PTST2 and PTST3. Chloroplasts in mesophyll cells typically contain five to seven granules, but remarkably, most chloroplasts in mutants contained zero or one large granule. Chloroplasts in had a slight reduction in granule number compared with the wild type, while those of the double mutant contained even fewer granules than The granules were larger but si... More

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