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2017 ; 130
(5
): 903-915
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Mouse Stbd1 is N-myristoylated and affects ER-mitochondria association and
mitochondrial morphology
#MMPMID28137759
Demetriadou A
; Morales-Sanfrutos J
; Nearchou M
; Baba O
; Kyriacou K
; Tate EW
; Drousiotou A
; Petrou PP
J Cell Sci
2017[Mar]; 130
(5
): 903-915
PMID28137759
show ga
Starch binding domain-containing protein 1 (Stbd1) is a carbohydrate-binding
protein that has been proposed to be a selective autophagy receptor for glycogen.
Here, we show that mouse Stbd1 is a transmembrane endoplasmic reticulum
(ER)-resident protein with the capacity to induce the formation of organized ER
structures in HeLa cells. In addition to bulk ER, Stbd1 was found to localize to
mitochondria-associated membranes (MAMs), which represent regions of close
apposition between the ER and mitochondria. We demonstrate that N-myristoylation
and binding of Stbd1 to glycogen act as major determinants of its subcellular
targeting. Moreover, overexpression of non-myristoylated Stbd1 enhanced the
association between ER and mitochondria, and further induced prominent
mitochondrial fragmentation and clustering. Conversely, shRNA-mediated Stbd1
silencing resulted in an increase in the spacing between ER and mitochondria, and
an altered morphology of the mitochondrial network, suggesting elevated fusion
and interconnectivity of mitochondria. Our data unravel the molecular mechanism
underlying Stbd1 subcellular targeting, support and expand its proposed function
as a selective autophagy receptor for glycogen and uncover a new role for the
protein in the physical association between ER and mitochondria.