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In situ structural analysis of Golgi intracisternal protein arrays #MMPMID26311849
Engel BD; Schaffer M; Albert S; Asano S; Plitzko JM; Baumeister W
Proc Natl Acad Sci U S A 2015[Sep]; 112 (36): 11264-9 PMID26311849show ga
To our knowledge, this is the first detailed study of Golgi ultrastructure within unperturbed cells. Three intracisternal structures were identified, with implications for Golgi architecture and trafficking: (i) Bundles of filaments show how cargoes may oligomerize to increase their local concentration at trans-Golgi buds. (ii) Granular aggregates provide evidence for cisternal maturation, as they are likely too large to transit the Golgi via vesicles. (iii) Protein arrays link the membranes of the central trans-Golgi cisternae, simultaneously maintaining the narrow luminal spacing while promoting cargo exit from the Golgi periphery by excluding material from the center. The asymmetry of the array structure indicates that the apposing membranes of a single cisterna have distinct compositions. The assembly of arrays may also enhance glycosyltransferase kinetics.