Cloning, expression, and functional characterization of the von Willebrand factor–cleaving protease (ADAMTS13)‏ by Barbara Plaimauer, Klaus Zimmermann,

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Cloning, expression, and functional characterization of the von Willebrand factor–cleaving protease (ADAMTS13)‏ by Barbara Plaimauer, Klaus Zimmermann, Dirk Völkel, Gerhard Antoine, Randolf Kerschbaumer, Pegah Jenab, Miha Furlan, Helen Gerritsen, Bernhard Lämmle, Hans Peter Schwarz, and Friedrich Scheiflinger Blood Volume 100(10):3626-3632 November 15, 2002 ©2002 by American Society of Hematology

Schematic drawing of the cloning of the recombinant ADAMTS13 expression plasmid.The 4.12-kb ADAMTS13 cDNA encompassing exons 3 to 29 (black bar) was PCR amplified and cloned into pcDNA3.1 digested withEcoRI/XhoI (gray arrows). Schematic drawing of the cloning of the recombinant ADAMTS13 expression plasmid.The 4.12-kb ADAMTS13 cDNA encompassing exons 3 to 29 (black bar) was PCR amplified and cloned into pcDNA3.1 digested withEcoRI/XhoI (gray arrows). In pcDNA3.1, the CMV promoter drives the eukaryotic expression (bold black arrow indicating direction of transcription). The resultant vector pCMV/VWF-cp/3-29 was digested with EcoRI/AscI (gray arrows) and ligated to the 0.7-kb VWF-cp/5′-terminal cDNA fragment (white bar). The final plasmid pCMV/VWF-cp (9.7 kb) was used for the expression of the complete rADAMTS13 gene. A indicates AscI; E,EcoRI; X, XhoI. Barbara Plaimauer et al. Blood 2002;100:3626-3632 ©2002 by American Society of Hematology

Western blot of transiently expressed ADAMTS13 Western blot of transiently expressed ADAMTS13.Lysates and conditioned media from transfected HEK 293 cells transiently expressing ADAMTS13 were loaded on SDS-polyacrylamide gels, blotted to nitrocellulose, and visualized by murine monoclonal antibody 242/H... Western blot of transiently expressed ADAMTS13.Lysates and conditioned media from transfected HEK 293 cells transiently expressing ADAMTS13 were loaded on SDS-polyacrylamide gels, blotted to nitrocellulose, and visualized by murine monoclonal antibody 242/H1 directed against the catalytic domain of VWF-cp. The amount of lysate and conditioned medium loaded onto the gel was equivalent to approximately 1 × 106 cells. Lanes 1 and 3, conditioned medium and lysate from HEK 293 cells transfected with control vector pcDNA3.1; lanes 2 and 4, conditioned medium and lysate from cells transfected with VWF-cp expression vector pCMV/VWF-cp. M indicates protein standard in kDa. Barbara Plaimauer et al. Blood 2002;100:3626-3632 ©2002 by American Society of Hematology

VWF-cleaving protease activity in lysates and conditioned media of cells transiently expressing ADAMTS13.Diluted lysates and conditioned media from transfected HEK 293 cells were activated with BaCl2 and incubated with 2.5 μg VWF. NHP dilutions were used fo... VWF-cleaving protease activity in lysates and conditioned media of cells transiently expressing ADAMTS13.Diluted lysates and conditioned media from transfected HEK 293 cells were activated with BaCl2 and incubated with 2.5 μg VWF. NHP dilutions were used for assay calibration. Multimeric analysis of VWF was carried out by SDS gel electrophoresis in 1% agarose gels, and VWF was detected by immunostaining. Sample dilutions are indicated. VWF-cp assay was carried out with cell lysates (lanes 6-8) and conditioned medium (lanes 10-12) from transfections with plasmid pCMV/VWF-cp and the control vector (lanes 5 and 9) and with NHP (lanes 1-3) and buffer (lane 4) as probes. Barbara Plaimauer et al. Blood 2002;100:3626-3632 ©2002 by American Society of Hematology

Cleavage of VWF subunits by rADAMTS13 Cleavage of VWF subunits by rADAMTS13.Western blot analysis of VWF fragments after VWF-cp digestion. Cleavage of VWF subunits by rADAMTS13.Western blot analysis of VWF fragments after VWF-cp digestion. VWF cleavage fragments were separated by SDS-PAGE under reducing conditions. VWF substrate (lane 1) was incubated with NHP (lane 2), buffer (lane 3), lysates, and conditioned media from HEK 293 transfections with the control vector (lanes 4 and 6) and with the VWF-cp expression plasmid (lanes 5 and 7). Lysates, conditioned media, and NHP were diluted 1:10 in the VWF-cp assay. M indicates protein standard in kilodaltons. Barbara Plaimauer et al. Blood 2002;100:3626-3632 ©2002 by American Society of Hematology

Inhibition of rADAMTS13 activity by TTP patient plasma containing antibodies neutralizing VWF-cp activity.VWF-cp assay mixtures were loaded onto an SDS-1% agarose gel, and the VWF multimer pattern was detected by immunostaining. Inhibition of rADAMTS13 activity by TTP patient plasma containing antibodies neutralizing VWF-cp activity.VWF-cp assay mixtures were loaded onto an SDS-1% agarose gel, and the VWF multimer pattern was detected by immunostaining. (A) Inhibitory TTP patient plasma was added (+) to the samples before dilution (1:20) activation and incubation with VWF. Buffer was used instead of TTP plasma in some samples (−). Samples used were pooled NHP (lanes 2 and 3), conditioned medium derived from transfections using the vector control (lanes 4 and 6), and VWF-cp expression vector (lanes 5 and 7). VWF-substrate is shown in lane 1. (B) Purified IgG derived from pooled NHP or acquired TTP patient plasma and buffer as control was mixed with conditioned medium containing rADAMTS13 either concentrated (lanes 1, 5, 9) or diluted 1:4 (lanes 2, 6, 10), 1:16 (lanes 3, 7, 11), or 1:64 (lanes 4, 8, 12). (C) NHP was incubated directly (lanes 1, 3, 5) or diluted 1:2 (lanes 2, 4, 6) with purified IgG from NHP or inhibiting TTP patient plasma and buffer. Barbara Plaimauer et al. Blood 2002;100:3626-3632 ©2002 by American Society of Hematology