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All Journal HAYATI Journal of Biosciences Narra J Makara Journal of Science
Andri Wardiana, Andri
Research Center for Biotechnology, Indonesian Institute of Sciences Jl. Raya Bogor KM 46, Cibinong, Bogor, 16911, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Health Professions Immunology & microbiology Medicine & Pharmacology Public Health

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PURIFICATION AND CARBOHYDRATE ANALYSIS OF RECOMBINANT HUMAN ERYTHROPOIETIN EXPRESSED IN YEAST SYSTEM Pichia pastoris Wardiana, Andri; Santoso, Adi
Makara Journal of Science Vol. 15, No. 1
Publisher : UI Scholars Hub

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Abstract

SARS-CoV-2 lineages and naso-oropharyngeal bacterial communities in COVID-19 reinfection: A study in West Java, Indonesia Sativa, Alvira R.; Asyifa, Isnaini Z.; Adzdzakiy, Muhammad M.; Iryanto, Syam B.; Nugroho, Herjuno A.; Wulandari, Ari S.; Yanthi, Nova D.; Nasrulloh, Mukh F.; Rahmawati, Ema; Alamanda, Cut NC.; Ristandi, Ryan B.; Rachman, Rifky W.; Robiani, Rini; Agustiyani, Dian F.; Wisnuwardhani, Popi H.; Wardiana, Andri; Ningrum, Ratih A.; Dharmayanthi, Anik B.; Prasetyoputri, Anggia; Fibriani, Azzania; Saputra, Sugiyono
Narra J Vol. 5 No. 3 (2025): December 2025
Publisher : Narra Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52225/narra.v5i3.2901

Abstract

Continuous emergence of new severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants may influence viral transmission dynamics and alter interactions with the respiratory microbiota, potentially increasing the risks of reinfection. This study investigated cases of coronavirus disease 2019 (COVID-19) reinfection in West Java, Indonesia, with the aim of identifying the SARS-CoV-2 variants involved, characterizing their genomic mutations, and profiling the nasal and oropharyngeal microbiota associated with reinfection. Naso-oropharyngeal swab samples were collected from 42 COVID-19 reinfection cases and nine new infection cases. Whole genome sequencing was performed using Oxford Nanopore Technologies (ONT) MinION Mk1C and variant analysis was conducted using ARTIC workflow. Nexstrain and PANGOLIN were used to determine the lineages. Phylogenetic trees were constructed using IQ-tree and FigTree. Key mutations were identified by Cov-GLUE. Additionally, 16s rRNA amplicon sequencing was conducted on nine samples from each group to analyze bacterial communities using EPI2ME and MicrobiomeAnalyst. All identified SARS-CoV-2 strains in this study were Delta variant (B.1.617.2), predominantly lineage AY.23 (n=46, 90%), followed by AY.24 (n=3) and AY.109 (n=2). No differences in SARS-CoV-2 lineages were observed between reinfection and new infection cases. Unique hotspot mutations found only in COVID-19 reinfections included NSP3, V220A, S_T676I, ORF7a_V82A, and ORF7a_TI20I. Bacterial community analysis revealed no significant diversity differences (alpha and beta) between the two groups. While the most dominant phylum remained Terrabacteria in both groups, Streptococcus was dominant in COVID-19 reinfections, whereas Prevotella was dominant in new infection cases. Notably, Haemophilus parainfluenzae, Fusobacterium periodonticum, Fusobacterium nucleatum, and Leptotrichia buccalis had significant increases in reinfection cases. Despite the similarity in SARS-CoV-2 lineages causing both COVID-19 reinfection and new infection cases, the presence of distinct key mutations and bacterial species suggest their potential as biomarkers within this group.
Evaluation of Curcumin-derived Carbon-dots' Inhibitory Activity as SARS-CoV-2 Antiviral Candidate Using Chemical Crosslinking Taharuddin, Audrey Angelina Putri; Yamahoki, Nicholas; Stephanie, Rebecca; Agustiyanti, Dian Fitria; Wisnuwardhani, Popi Hadi; Angelina, Marissa; Rubiyana, Yana; Ningrum, Ratih Asmana; Wardiana, Andri; Desriani, Desriani; Hariyatun, Hariyatun; Iskandar, Ferry; Permatasari, Fitri Aulia; Giri-Rachman, Ernawati Arifin; Fibriani, Azzania
HAYATI Journal of Biosciences Vol. 33 No. 1 (2026): January 2026
Publisher : Bogor Agricultural University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.4308/hjb.33.1.232-239

Abstract

In our previous work, we demonstrated that curcumin-derived carbon dots (Cur-CDs) have potential as antivirals for COVID-19. However, the precise mechanism of action remains unclear. This study investigated the potential of Cur-CDs against SARS-CoV-2 by targeting the dimerization of the C-terminal domain of nucleocapsid protein (N-CTD) using chemical crosslinking. Recombinant SARS-CoV-2 N-CTD was expressed, purified, and subjected to chemical crosslinking. The dimerization inhibition ability of Cur-CDs was assessed with ligand concentrations ranging from 0 to 2,000 μg/mL. Successful inhibition —defined as a noticeable reduction in SARS-CoV-2 N-CTD dimer band intensity on SDS-PAGE—was observed when Cur-CDs were present at 8 to 16 times the protein concentration. We hypothesize that Cur-CDs bind to the dimerization residues, preventing non-covalent interactions between monomers and limiting dimer formation. Our findings suggest that Cur-CDs could be a promising antiviral strategy for SARS-CoV-2, especially targeting the dimerization of the nucleocapsid protein. Additionally, this study also highlights the use of chemical crosslinking as a valuable tool for interaction-based drug screening.
Co-Authors Adi Santoso Adzdzakiy, Muhammad M. Agustiyani, Dian F. Agustiyanti, Dian Fitria Agustus Sani Nugroho & Ema Rahmawati Heryaman, Agustus Sani Nugroho & Alamanda, Cut NC. Asyifa, Isnaini Z. Azzania Fibriani Desriani Desriani Dharmayanthi, Anik B. Ernawati A. Giri Rachman Ferry Iskandar Hariyatun, Hariyatun Husnaa, Ulfatul Iryanto, Syam B. Kusumawati, Arizah Marissa Angelina Nasrulloh, Mukh F. Neng Herawati, Neng Ningrum, Ratih A. Nugroho, Herjuno A. Permatasari, Fitri Aulia Popi Hadi Wisnuwardhani, Popi Hadi Prasetyoputri, Anggia Rachman, Rifky W. RATIH ASMANA NINGRUM Ristandi, Ryan B. Robiani, Rini Saputra, Sugiyono Sativa, Alvira R. Stephanie, Rebecca Taharuddin, Audrey Angelina Putri Wijaya, Sri Kartika Wisnuwardhani, Popi H. Wulandari, Ari S. Yamahoki, Nicholas Yana Rubiana, Yana Yana Rubiyana, Yana Yanthi, Nova D.