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Volumn 281, Issue 5377, 1998, Pages 700-702

Functional reconstitution of Ypt7p GTPase and a purified vacuole SNARE complex

Author keywords

[No Author keywords available]

Indexed keywords

GUANOSINE TRIPHOSPHATASE; MEMBRANE PROTEIN;

EID: 0032584707     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.281.5377.700     Document Type: Article
Times cited : (38)

References (32)
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    • Saccharomyces cerevisiae strains used (6) were BJ3505 (pep4::HIS3), DKY6281 (pho8::TRP1), and K91-1A (pho8::pAL134 pho13::pH13). Vacuole and cytosol preparation and the standard fusion reaction were as described (5, 6)
    • Saccharomyces cerevisiae strains used (6) were BJ3505 (pep4::HIS3), DKY6281 (pho8::TRP1), and K91-1A (pho8::pAL134 pho13::pH13). Vacuole and cytosol preparation and the standard fusion reaction were as described (5, 6).
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    • note
    • 6-ALP. The clarified (20 min, 125,000g) extract was rapidly diluted with 40 volumes of 20 mM Hepes-KOH (pH 7.4) containing 150 mM NaCl and incubated (4°C, 10·to 15 min, gentle mixing). Reconstituted proteoliposomes were sedimented (55,000 rpm, for 60 min at 4°C, with a Beckman 60Ti rotor), suspended to 0.5 volumes in 10 mM Pipes-KOH (pH 6.8) containing 200 mM sorbitol, frozen in liquid nitrogen, thawed, sonicated (5 to 10 s in a Branson bath sonifier, model 2200), and centrifuged (16,000g, 10 min). The supernatant was reconstituted proteoliposomes.
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    • note
    • PHO8 was amplified from plasmid pAL146, kindly provided by C. Payne (University of California, Los Angeles), by polymerase chain reaction with the primers 5′-CGCATTGGATCCATGATGACTCACAGATTACCA-3′ and 5′-TATGTTGACGTCGACTGCGCTGTGACC-3′ and cloned into the Bam HI and Hind III sites of pQE30 (Qiagen). ProALP was purified from E. coli membranes (24) solubilized with 20 mM Hepes-KOH (pH 8.0) containing 0.5 M NaCl, 30 mM imidazole (pH 8.0), 1 mM DTT, 0.5 mM phenylmethylsulfonyl fluoride (PMSF), and 1.25% (w/v) n-octyl-β-D-glucopyranoside. The extract was mixed with Ni-NTA agarose, washed with the solubilization buffer containing 30 mM imidazole, and eluted with the solubilization buffer but with 0.5 M imidazole and no PMSF.
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    • note
    • 6-Sec18p (300 μg) was incubated with 2 ml of Ni-NTA agarose in buffer A, and the beads were washed with buffer A, added to the vacuole detergent extract, and incubated for 60 min with constant agitation. The beads were packed into a column and, after washing with buffer B [20 mM Hepes-KOH (pH 8.0) containing 2 mM DTT, 0.2 mM ATP-γ-S, 10% (v/v) glycerol, PIC, and 1.25% (w/v) n-octyl-β-D-glucopyranoside] with 150 mM NaCl added, the proteins were eluted with 3 ml of buffer B with 50 mM NaCl and 0.5 M imidazole added.
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    • note
    • We thank N. Margolis for expert assistance and R. Schekman, C. Barlowe, Z. Xu, C. Ungermann, G. Eitzen, J. Eichler, F. Duong, and A. Price for discussions. Supported by the National Institute of General Medical Sciences. K.S. is supported by a Japan Society for the Promotion of Science Fellowship and an Human Frontier Science Program Long-Term Fellowship.


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