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• W1569326224 endingPage "24891" @default.
• W1569326224 startingPage "24887" @default.
• W1569326224 abstract "Furin is a membrane-associated calcium-dependent serine endoprotease that cleaves proproteins on the carboxyl side of the consensus sequence -Arg-X-Lys/Arg-Arg-. Using site-directed mutagenesis, a variant alpha 1-antitrypsin (alpha 1-AT) was constructed which contains in its reactive site -Arg-X-X-Arg-, the minimal sequence required for efficient processing by furin (Molloy, S. S., Bresnahan, P. A., Leppla, S. H., Klimpel, K. R., and Thomas, G. (1992) J. Biol. Chem. 267, 16396-16402). This alpha 1-AT variant, [Arg355 Arg358]alpha 1-AT (alpha 1-PDX), is greater than 3,000-fold more effective than [Arg358]alpha 1-AT (alpha 1-AT Pittsburgh, alpha 1-PIT) at inhibiting furin in vitro (K0.5 = 0.03 microgram/ml). Furthermore, the P4 Arg in alpha 1-PDX greatly attenuates the thrombin inhibitory properties of this serpin (> 300-fold) compared with alpha 1-PIT (which contains a P4 Ala), thus increasing the selectivity of alpha 1-PDX for furin. Expression studies show that alpha 1-PDX, and not alpha 1-PIT, blocks the processing of two furin substrates, pro-beta-nerve growth factor and human immunodeficiency virus (HIV)-1 gp160 in transfected cells. In addition, a syncytium assay shows that alpha 1-PDX blocks the membrane fusogenic properties of HIV-1 gp160. The potential use of alpha 1-PDX in manipulating the activation of proproteins in a tissue- and time-specific manner is discussed." @default.
• W1569326224 created "2016-06-24" @default.
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• W1569326224 date "1993-11-01" @default.
• W1569326224 modified "2023-10-12" @default.
• W1569326224 title "Inhibition of HIV-1 gp160-dependent membrane fusion by a furin-directed alpha 1-antitrypsin variant." @default.
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• W1569326224 doi "https://doi.org/10.1016/s0021-9258(19)74548-7" @default.
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