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2017 ; 26
(3
): 452-463
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Domain architecture of vasohibins required for their chaperone-dependent
unconventional extracellular release
#MMPMID27879017
Kadonosono T
; Yimchuen W
; Tsubaki T
; Shiozawa T
; Suzuki Y
; Kuchimaru T
; Sato Y
; Kizaka-Kondoh S
Protein Sci
2017[Mar]; 26
(3
): 452-463
PMID27879017
show ga
Vasohibins (VASH1 and VASH2) are recently identified regulators of angiogenesis
and cancer cell functions. They are secreted proteins without any classical
secretion signal sequences, and are thought to be secreted instead via an
unconventional protein secretion (UPS) pathway in a small vasohibin-binding
protein (SVBP)-dependent manner. However, the precise mechanism of SVBP-dependent
UPS is poorly understood. In this study, we identified a novel UPS regulatory
system in which essential domain architecture (VASH-PS) of VASHs, comprising
regions VASH1(91-180) and VASH2(80-169) , regulate the cytosolic punctate
structure formation in the absence of SVBP. We also demonstrate that SVBP form a
complex with VASH1 through the VASH1(274-282) (SIa), VASH1(139-144) (SIb), and
VASH1(133-137) (SIc), leading to the dispersion in the cytosol and extracellular
release of VASH1. The amino acid sequences of VASH-SIa and VASH-PS, containing
SIb and SIc, are highly conserved among VASH family members in vertebrates,
suggesting that SVBP-dependent UPS may be common within the VASH family. This
novel UPS regulatory system may open up new avenues for understanding fundamental
protein secretion in vertebrates.