Sains Malaysiana 42(6)(2013):
715–724
Pengenalpastian
dan Pencirian Gen Trichoderma virens UKM1 Mengekod Enzim
Terlibat
dalam Pencuraian Kitin Krustasea
(Identification and Characterisation of Trichoderma virens UKM1 Genes Encoding
for Enzymes Involved in the Degradation of Crustacean Chitin)
Abdul
Munir Abdul Murad*, Rafidah Badrun, Sakina Shahabudin, Shazilah Kamaruddin,
Madihah Ahmad Zairun, Farahayu Khairuddin, Zamri Zainal & Farah Diba Abu
Bakar
Pusat
Pengajian Biosains dan Bioteknologi, Fakulti Sains dan Teknologi
Universiti Kebangsaaan Malaysia, 43600 Bangi, Selangor D.E. Malaysia
Nor Muhammad Mahadi
Malaysia Genome Institute, Jalan Bangi Lama, 43000 Kajang,
Selangor, Malaysia
Rosli Md. Illias
Jabatan Kejuruteraan Bioproses, Fakulti Kejuruteraan Kimia
dan Kejuruteraan Sumber Asli,
Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia
Diserahkan: 14 Mei 2012/Diterima: 13 September 2012
ABSTRAK
Kitin merupakan polisakarida struktur yang dapat dicurai oleh
enzim kitinolisis kepada pelbagai terbitan yang boleh digunakan dalam bidang
perubatan, pertanian dan rawatan air. Pengenalpastian dan pencirian gen-gen Trichoderma virens UKM1 mengekod enzim
terlibat dalam pencuraian kitin krustasea telah dilakukan melalui penjanaan
penanda jujukan terekspres (ESTs) dan analisis pengekspresan gen
menggunakan mikroatur DNA. Sebanyak tiga perpustakaan cDNA T.
virens UKM1
yang masing-masing diaruh oleh kitin, glukosamina dan kitosan telah dibina. Sejumlah 1536 klon cDNA telah dijujuk dan sebanyak 1033 ESTs
berkualiti telah dijana. Seterusnya, perbezaan
pengekspresan gen apabila pertumbuhan kulat diaruh dengan kehadiran kitin
krustasea dan tanpa kitin pada hari ketiga dan kelima telah ditentukan. Sebanyak 1824 klon cDNA telah dititik ke atas slaid kaca dan
dihibrid bersama dengan cDNA terlabel Cy3 atau Cy5 yang disintesis
daripada mRNA yang dipencil daripada kulat yang ditumbuhkan dalam medium
mengandungi kitin krustasea atau glukosa (kawalan). Sebanyak 91 dan 61 gen, masing-masing bagi hari ketiga dan kelima didapati
terekspres melebihi dua gandaan apabila kulat menggunakan kitin krustasea
sebagai sumber karbon. Beberapa gen mengekod kitinase seperti ech1 dan cht3 (endokitinase), nag1 (eksokitinase) dan nagB(glukosamina
6-P-deaminase) didapati terekspres dengan tinggi pada kedua-dua hari. Selain daripada itu, gen mengekod protein hidrofobin, protease
serina dan beberapa protein hipotetik juga terekspres dengan tinggi dengan
kehadiran kitin krustasea. Protein-protein ini dijangka
memainkan peranan penting dalam membantu pencuraian kitin krustasea.
Kata kunci: Kitin; kitinase; mikroatur DNA; penanda jujukan
terekspres; Trichoderma virens
ABSTRACT
Chitin is a structural polysaccharide which can be degraded by
chitinolytic enzymes to various derivatives that can be utilised in medicine,
agriculture and water treatment. The identification and characterisation of Trichoderma virens UKM1 genes encoding
for enzymes involved in crustacean chitin degradation were carried out by
generating expressed sequence tags (ESTs) and analysing gene expression via DNA microarray.
Three cDNA libraries of T. virens UKM1 induced with chitin, glucosamine and
chitosan, respectively, were constructed. A total of 1536 cDNA clones were sequenced
and 1033 of high-quality ESTs were generated. Subsequently, differences
in gene expression between cells grown in the presence and absence of
crustacean chitin on the third and fifth days were determined. A total of 1824
cDNA clones
were spotted on glass slides and co-hybridised with Cy3- or Cy5-labeled cDNA,
synthesised from mRNA isolated from cells grown in medium
containing crustacean chitin or glucose (control). A total of 91 and 61 genes
were expressed by more than two-fold on the third and fifth day, respectively,
when the fungus used crustacean chitin as the carbon source. Several genes
encoding for chitinase such as ech1 and cht3 (endochitinases), nag1 (exochitinase) and nagB(glucosamine
6-P-deaminase) were found highly expressed on both days. In addition, genes
encoding for hydrophobin, serine protease and several hypothetical proteins
were also expressed at high levels when cells were exposed to crustacean
chitin. These proteins may play significant role in the degradation of
crustacean chitin.
Keywords: Chitin; chitinase; DNA microarray;
expressed sequence tag; Trichoderma virens
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*Pengarang
untuk surat-menyurat; e-mail: munir@ukm.my
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