title: Gene expression and functional studies of small heat shock protein 37 (MrHSP37) from Macrobrachium rosenbergii challenged with infectious hypodermal and hematopoietic necrosis virus (IHHNV).
abstract: In this study, we have reported a full length of small heat shock protein 37 (designated MrHSP37) gene, identified from the transcriptome database of freshwater prawn Macrobrachium rosenbergii. The complete gene sequence of the MrHSP37 is 2,425 base pairs in length, and encodes 338 amino acids. MrHSP37 contains a long heat shock protein family profile in the amino acid sequence between 205 and 288. The mRNA expressions of MrHSP37 in healthy and the infectious hypodermal and hematopoietic necrosis virus (IHHNV) challenged M. rosenbergii were examined using quantitative real time polymerase chain reaction (qRT-PCR). MrHSP37 is highly expressed in hepatopancreas and all the other tissues (walking leg, gills, muscle, stomach, haemocyte, intestine, pleopods, brain and eye stalk) of M. rosenbergii taken for analysis. The expression is strongly up-regulated after IHHNV challenge. To understand its biological activity, the recombinant MrHSP37 gene was constructed and expressed in Escherichia coli BL21 (DE3). The results of ATPase assay showed that the recombinant MrHSP37 protein exhibited apparent ATPase activity which increased with the concentration of the protein. And also the purified recombinant MrHSP37 protein was used for thermal aggregation assay (chaperone activity). It showed that the recombinant MrHSP37 protein is an active chaperone in this assay. Taken together, these results suggest that MrHSP37 is potentially involved in the immune responses against IHHNV challenge in M. rosenbergii.
authors.affiliation: Centre for Biotechnology in Agriculture Research, Division of Genetics & Molecular Biology, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia.
authors.forename: Jesu
authors.initials: J
authors.lastname: Arockiaraj
authors.forename: Puganeshwaran
authors.initials: P
authors.lastname: Vanaraja
authors.forename: Sarasvathi
authors.initials: S
authors.lastname: Easwvaran
authors.forename: Arun
authors.initials: A
authors.lastname: Singh
authors.forename: Rofina Yasmin
authors.initials: RY
authors.lastname: Othman
authors.forename: Subha
authors.initials: S
authors.lastname: Bhassu
mesh_terms: D000818:Animals; D060829:Arthropod Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D002950:Citrate (si)-Synthase / Q000737:chemistry; D019223:Densovirinae / Q000502:physiology*; D005786:Gene Expression Regulation; D050888:Heat-Shock Proteins, Small / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D054884:Host-Pathogen Interactions; D009928:Organ Specificity; D033541:Palaemonidae / Q000378:metabolism* / Q000821:virology*; D010802:Phylogeny; D011489:Protein Denaturation; D011499:Protein Processing, Post-Translational; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D020539:Sequence Analysis, Protein; D017386:Sequence Homology, Amino Acid; D014158:Transcription, Genetic
chemical_list: D060829:Arthropod Proteins; D050888:Heat-Shock Proteins, Small; D011994:Recombinant Proteins; D002950:Citrate (si)-Synthase