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Kim, Soo Cheol,Sumi, Kanij Rukshana,Sharker, Md Rajib,Kho, Kang Hee The Korean Society of Marine Life Science 2018 한국해양생명과학회지 Vol.3 No.1
Myosin is considered as the vital motor protein in vertebrates and invertebrates. Our present study was conducted to decipher the occurrence of myosin in dog fish (Squalus mitsukurii). We isolated one clone containing 979 bp cDNA sequence, which consisted of a complete coding sequence of 453 bp and a deduced amino acid sequence of 150 amino acids from the open reading frame with molecular weight, isoelectric point and aliphatic index are 16.72 Kda, 4.49 and 78.00, respectively. It contained 428 bp long 3' UTR with single potential polyadenylation signals (AATAAA). The predicted EF CA<sup>2+</sup> binding domains were identified in residue 6-41, 83-118 and 133-150. A BLAST search indicates this protein exhibits a strong similarity to whale shark (Rhincodon typus) MLC3 (91% identical) and also house mouse (Mus musculus) MLC isoform 3f (81% identical). Phylogenetic analysis revealed that this protein is a MLC 3 isoform like protein. This protein also demonstrates highly conserved region with other myosin proteins. Homology modeling of S. mitsukuri was performed using crystal structure of Gallus gallus skeletal muscle myosin II based on high similarity. Reverse transcription-polymerase chain reaction (PCR), quantitative PCR results exhibits dogfish myosin protein is highly expressed in muscle tissue.
Kanij Rukshana Sumi,김수철,Jewel Howlader,Md Rajib Sharker,최갑성,최상기,박종인,노일섭,고강희 한국해양과학기술원 2019 Ocean science journal Vol.54 No.3
A carbonic anhydrase VII gene, encoding 277 amino acids, was identified in the intestinal tissue of pufferfish (Takifugu rubripes). The translated protein with an 833-bp complete coding sequence derived from the 1378-bp cloned sequence showed 83% identity with swamp eel CA VII, 76% with zebrafish CA VII, and 77% with coho salmon CA VII-like protein. The cloned protein also showed 68–69% identity with mammalian CA VII. The predicted molecular weight and iso-electric point of the protein were 30.84 kDa and 6.07, respectively. Active site analysis of the pufferfish CA VII indicated that most of the important residues involved in catalytic activity were highly conserved, whereas four cysteine residues at positions 55, 103, 184, and 275 differed from those in human CA II, and were related to cell-defense mechanisms against oxidative damage. Phylogenetic analysis showed that the cloned sequence was clustered within the fish CA VII clade and close to the swamp eel CA VII. Structural modeling of the pufferfish CA VII protein revealed the conservation of zinc binding histidine residues (zinc ion and histidine residues). Differential expression patterns of the pufferfish CA VII were determined with semiquantitative reverse transcription (RT)-PCR and quantitative PCR (q-PCR) as well. The results of q-PCR revealed that the pufferfish CA VII was highly expressed in intestinal tissue. The pufferfish CA VII was also detected within intestinal tissue sections using an in situ hybridization assay.