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2, 10% sucrose, 1 mM adenosine triphosphate (ATP)] and lysed by freezethawing. The lysate was differentially centrifuged (15 min at 1500g, 15 min at 15,000g, 60 min at 100,000g, 3 hours at 100,000g), and the resulting pellet of HMW proteins was resuspended in 50 mM tris-HCl (pH 7.4), 20% glycerol, 5 mM MgCl2, 0.5 mM β-mercaptoethanol, 1 mM ATP) and stored at -80°C. Samples of the resuspended material were separated on a Mono Q (HR16/10) anion-exchange column [buffer A: 20 mM Hepes (pH 7.2), 15% glycerol, 1 mM ATP; buffer B: 20 mM Hepes (pH 7.2), 15% glycerol, 1 M NaCl, 1 mM ATP] followed by gel filtration on a Superose 6-column [2 cm by 50 cm; elution buffer: 20 mM Hepes (pH 7.2), 100 mM NaCl, 15% glycerol, 1 mM ATP]. All purification steps were carried out at 4°C. Samples of collected fractions were used to measure hydrolysis of Suc-LLVY-AMC and AAF-AMC (4).
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note
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Peptidase assays were performed as described (14).
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note
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18O isotopic distribution. The peptides were sequenced on a API III triple quadrupole instrument (PE-Sciex, Toronto, Canada) equipped with a nanoelectrospray source by differential scanning (M. Wilm, G. Neubauer, L. Taylor, A. Shevchenko, A. Bachi, in preparation).
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0344228612
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2, 0.5 mM 2-mercaptoethanol, 5% glycerol]. The analysis of peptide products was performed as described (14).
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32
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0344606644
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note
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We thank S. Gaedicke for technical assistance, E. J. Corey for supplying lactacystin, K. Peters and A. Würch for helpful discussions, and I. Haidl for critical reading of the manuscript. Supported by a grant of the Deutsche Forschungsgemeinschaft (Nl 368/2-1) to G.N.
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