STUDI INTERAKSI SENYAWA KOMPLEKS BESI TERHADAP PROTEIN HEMOFOR PADA PSEUDOMONAS AERUGINOSA (HasAp) SECARA IN SILICO
Abstrak
Sebuah protein hemofor yang dihasilkan oleh Pseudomonas aeruginosa (HasAp) dapat mengikat beberapa senyawa kompleks logam selain Protoporfirin-IX (heme). Struktur kristal dari protein HasAp yang mengandung senyawa kompleks logam hanya menunjukkan sedikit perubahan pada keseluruhan struktur protein HasAp. Fe-ftalosianina (Fe-Pc) dan Fe-mesoporfirin-IX (Fe-MPIX) mampu menghambat protein HasAp yang terikat heme sebagai sumber zat besi. Pada penelitian ini akan dilakukan identifikasi, evaluasi, dan eksplorasi terhadap mekanisme aksi dari senyawa Fe-Pc dan Fe-MPIX terhadap protein HasAp, serta mengamati pengaruhnya pada bagian sisi aktif protein HasR dengan menggunakan studi in silico. Simulasi penambatan molekuler berbasis protein-ligan dilakukan dengan menggunakan perangkat lunak MGLTools 1.5.6 yang dilengkapi dengan AutoDock 4.2 untuk mengamati afinitas dan interaksi molekuler yang terbentuk antara molekul senyawa Fe-Pc dan Fe-MPIX terhadap makromolekul protein HasAp. Kemudian dilakukan simulasi penambatan molekuler berbasis protein-protein terhadap sistem kompleks protein-ligan untuk mengamati pengaruhnya terhadap area pengikatan dari makromolekul protein HasR dengan menggunakan perangkat lunak PatchDock. Hasil simulasi penambatan molekuler berbasis protein-ligan menunjukkan bahwa senyawa Fe-MPIX memiliki afinitas yang lebih baik dari senyawa Fe-Pc pada makromolekul protein HasAp-FeMPIX, dengan nilai energi bebas ikatan masing-masing ?65,73 kJ/mol dan ?63,97 kJ/mol. Kemudian, hasil simulasi penambatan molekuler berbasis protein-protein antara kompleks senyawa Fe-MPIX dan protein HasAp-FeMPIX terhadap protein HasR memiliki nilai atomic contact energy (ACE) paling positif, yaitu 1051,44 kJ/mol. Perbedaan ukuran struktur molekul senyawa terbukti mampu mempengaruhi mekanisme aksi terhadap protein target. Dengan demikian, diperlukan kehati-hatian dalam mendesain molekul senyawa inhibitor dari protein HasAp secara in silico.
Kata kunci: Fe-ftalosianina, Fe-mesoporfirin-IX, protein HasAp, protein HasR, Pseudomonas aeruginosa
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