Identification of ribosome-inactivating proteins (RIPs) from Phaleria macrocarpa (Scheff) Boerl., a posssible active compound
Abstract
Daging buah dan biji P. macrocarpa diektraksi dengan buffer natrium fosfat 5mM pH 7.2 yang mengandung sodium klorid 0,14M. Fraksi protein diperoleh dengan pengendapan menggunakan ammonium sulfat. Aktivitas RIP ditentukan menggunakan metode pemotongan DNA superkoil.
Hasil menunjukkan bahwa ekstrak gubal biji P. macrocarpa mempunyai kemampuan memotong DNA superkoil menjadi bentuk nik sirkularnya. Aktivitas tersebut nampak tergantung pada konsentrasi. Aktivitas fraksi protein dari biji terlihat lebih tinggi dibandingkan dengan ekstrak gubal, seperti ditunjukkan dengan munculnya bentuk linier pada konsentrasi protein sebesar 0.3μg/ml. Aktivitas memotong DNA superkoil tersebut tidak muncul pada crude extract dari daging buah. Sehingga dapat disimpulkan bahwa biji P. macrocarpa mengandung protein sejenis RIP.
Kata kunci: Ribosome-inactivating protein (RIPs), Phaleria macrocarpa, DNA superkoil
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DOI: http://dx.doi.org/10.14499/indonesianjpharm0iss0pp44-49
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