Sains Malaysiana 51(11)(2022): 3621-3633
http://doi.org/10.17576/jsm-2022-5111-09
Expression
Analysis using Reverse Transcription Quantitative Real-Time PCR (RT-qPCR)
Suggests Different Strategies in Parageobacillus caldoxylosilyticus ER4B under Exposure to Cold
Shock
(Analisis Pengekspresan menggunakan Transkripsi Berbalik
Kuantitatif Masa-Nyata PCR (RT-qPCR) Mencadangkan Strategi Berbeza untuk Parageobacillus caldoxylosilyticus ER4B
di bawah Pendedahan kepada Renjatan Sejuk)
CHING XIN JIE1, NOOR HYDAYATY MD YUSUF1,
NAZALAN NAJIMUDIN 2, CHEAH YOKE KQUEEN3 & CLEMENTE MICHAEL WONG
VUI LING1,4,*
1Biotechnology Research Institute, Universiti Malaysia Sabah, 88400 Kota Kinabalu, Sabah, Malaysia
2School of Biological Science, Universiti Sains Malaysia, Persiaran Bukit Jambul, 11900 Bayan Lepas,
Penang, Malaysia
3Department of Biomedical Science, Faculty of Medicine and Health
Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan,
Malaysia
4National Antarctic Research Centre, Universiti Malaya, 50603 Kuala Lumpur, Federal Territory,
Malaysia
Diserahkan: 29 April 2021/Diterima: 5 Julai 2022
Abstract
Microorganisms have acquired both common and unique abilities to
withstand cold stress on Earth. Many studies on bacterial cold shock have been
conducted, however, the majority of the studies were focused on mesophiles and psychrophiles. To
date, limited information is available on the response of thermophilic bacteria
to cold stress and therefore, it is not known how thermophilic bacteria would
respond to different cold shocks. To address this question, the cold shock
responses of a thermophilic Parageobacillus caldoxylosilyticus ER4B which has an optimal
growth temperature at 64 °C were
determined using Real-Time PCR (RT-qPCR). When the bacterium was exposed to mild cold shock at 54 °C, the expressions of gene encoding for pyruvate
kinase and acetolactate synthase were significantly
upregulated, suggesting that more pyruvate molecules were produced to
synthesize branched-chain amino acids that could alter the fatty acid profile
on the cell membrane. Accumulation of pyruvate in the bacterium could also help
to scavenge cold-induced reactive oxygen species (ROS). Meanwhile, exposing the
bacterium to extreme cold shock at 10 °C resulted
in significant upregulation of genes encoding for γ-glutamylcyclotransferase,
cold shock protein B and competence protein ComEA. An
increase in these enzymes expression indicated more extreme measures including
apoptosis and transformation were adopted during extreme cold shock.
Keywords: Cold shock; cold stress response; Parageobacillus caldoxylosilyticus; reverse transcription quantitative real-time
PCR (RT-qPCR); thermophilic bacterium
Abstrak
Mikroorganisma telah memperoleh ciri umum dan unik
untuk bertahan daripada tekanan suhu sejuk di bumi. Banyak kajian mengenai
kejutan sejuk bakteria telah dijalankan, namun kebanyakannya memfokuskan kepada
bakteria mesofil dan psikofil. Sehingga kini, terdapat maklumat yang terhad
mengenai gerak balas bakteria termofilik terhadap tekanan suhu rendah dan
sehubungan itu, bagaimana bakteria termofilik bergerak balas terhadap kejutan
sejuk yang berbeza masih belum diketahui. Untuk menjawab persoalan ini, gerak
balas kejutan sejuk daripada termofilik Parageobacillus caldoxylosilyticus ER4B yang mempunyai suhu pertumbuhan optimum pada suhu 64 °C telah ditentukan
melalui PCR Masa-Nyata (RT-qPCR). Apabila bakteria terdedah kepada kejutan
sejuk 54 °C, pengekspresan gen yang mengekodkan piruvat kinase dan asetolaktat
sintase menunjukkan peningkatan transkrip, mencadangkan bahawa lebih banyak
molekul piruvat dihasilkan untuk mensintesis asid amino rantai bercabang yang
dapat mengubah profil asid lemak pada membran sel. Pengumpulan piruvat pada
bakteria juga dapat membantu menghapuskan spesies oksigen reaktif (ROS) yang
disebabkan oleh suhu rendah. Sementara itu, pendedahan bakteria kepada kejutan
sejuk yang melampau pada 10 °C mengakibatkan peningkatan pengawalaturan pengekodan gen untuk
γ-glutamil siklotransferase, protein kejutan sejuk B dan protein
kompetensi ComEA. Peningkatan pengekspresan enzim tersebut menunjukkan
pendekatan yang lebih ekstrem termasuk apoptosis dan transformasi dilakukan
semasa kejutan sejuk yang melampau.
Kata kunci: Bakteria termofilik; gerak balas tekanan sejuk; kejutan sejuk; Parageobacillus caldoxylosilyticus;
PCR masa nyata-kuantitatif transkripsi berbalik
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*Pengarang untuk surat-menyurat; email:
michaelw@ums.edu.my