Proteolytic activation of the HIV-1 envelope glycoprotein gp160 is selectively performed by the proprotein convertase furin at the C terminus of the sequence R508-E-K-R511 (site 1), in spite of the presence of another consensus sequence, Lys500-Ala-Lys-Arg503 (site 2). On the basis of the solution structural analysis of the synthetic peptide p498, spanning the gp160 sequence Pro498-Gly516, we previously suggested a possible role of an N-terminal helix in regulating the exposure and accessibility of the gp160 physiological cleavage site, enclosed in a loop. Here we report on the activity and conformation of the 23 residue peptide h-REKR, designed to exhibit a large N terminal helix, followed by the gp160 native sequence, Arg508-Gly516, h-REKR is digested by furin with high efficiency comparable to the full native p498. Circular dichroism analyses, in mixtures from pure water to 98% trifluoroethanol, outline a significant content of helical structure in the peptide conformation. The molecular model obtained from NMR data collected in trifluoroethanol/water, by means of DYANA and AMBER simulations, indeed has helical structure on a large N-terminal segment. Such a long helix does not seem to affect the loop conformation of the C-terminal site 1-containing sequence, which exhibits the same proton chemical shifts already observed for the full native p498.

STRUCTURAL INVESTIGATION OF THE HIV-1 ENVELOPE GLYCOPROTEIN GP160 CLEAVAGE SITE: RELEVANCE OF A N-TERMINAL HELIX / R., Oliva; Falcigno, Lucia; D'Auria, Gabriella; M., Dettin; C., Scarinci; A., Pasquato; C., DI BELLO; L., Paolillo. - In: CHEMBIOCHEM. - ISSN 1439-4227. - ELETTRONICO. - 4:8(2003), pp. 727-733. [10.1002/cbic.200200541]

STRUCTURAL INVESTIGATION OF THE HIV-1 ENVELOPE GLYCOPROTEIN GP160 CLEAVAGE SITE: RELEVANCE OF A N-TERMINAL HELIX

FALCIGNO, LUCIA;D'AURIA, GABRIELLA;
2003

Abstract

Proteolytic activation of the HIV-1 envelope glycoprotein gp160 is selectively performed by the proprotein convertase furin at the C terminus of the sequence R508-E-K-R511 (site 1), in spite of the presence of another consensus sequence, Lys500-Ala-Lys-Arg503 (site 2). On the basis of the solution structural analysis of the synthetic peptide p498, spanning the gp160 sequence Pro498-Gly516, we previously suggested a possible role of an N-terminal helix in regulating the exposure and accessibility of the gp160 physiological cleavage site, enclosed in a loop. Here we report on the activity and conformation of the 23 residue peptide h-REKR, designed to exhibit a large N terminal helix, followed by the gp160 native sequence, Arg508-Gly516, h-REKR is digested by furin with high efficiency comparable to the full native p498. Circular dichroism analyses, in mixtures from pure water to 98% trifluoroethanol, outline a significant content of helical structure in the peptide conformation. The molecular model obtained from NMR data collected in trifluoroethanol/water, by means of DYANA and AMBER simulations, indeed has helical structure on a large N-terminal segment. Such a long helix does not seem to affect the loop conformation of the C-terminal site 1-containing sequence, which exhibits the same proton chemical shifts already observed for the full native p498.
2003
STRUCTURAL INVESTIGATION OF THE HIV-1 ENVELOPE GLYCOPROTEIN GP160 CLEAVAGE SITE: RELEVANCE OF A N-TERMINAL HELIX / R., Oliva; Falcigno, Lucia; D'Auria, Gabriella; M., Dettin; C., Scarinci; A., Pasquato; C., DI BELLO; L., Paolillo. - In: CHEMBIOCHEM. - ISSN 1439-4227. - ELETTRONICO. - 4:8(2003), pp. 727-733. [10.1002/cbic.200200541]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/4212
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