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The highly-conserved tumor suppressor, QM-like gene homologues have been cloned and characterized from various
organisms including vertebrates such as mammals and fish, invertebrates such as insects (D. melanogaster) and shrimp (P.
japonicus), plants, yeast and protozoan parasites. The gene encodes a ribosomal protein L10 and has been implicated to function
during cell growth, cell differentiation, apoptosis and immunological defence mechanisms. The study describes the molecular
characterization and structure analysis of a putative tumor suppressor, QM-like gene (designated as PrQM) found in a normalized
whole tissue cDNA library of the cabbage butterfly, Pieris rapae, considered to be a serious agricultural pest in the world. The
sequence comprised of 660-bp open reading frame and encoded a protein of 219 amino acids corresponding to 26 kDa protein
with predicted ribosomal protein L10a/L10e domain. PrQM amino acid sequence showed high levels of conservation at their
N-terminal regions with putative QM homologues from other insects. The apparent difference in functional modules in insects
can therefore be attributed to the less conserved C-terminus. The cDNA corresponding to PrQM was thereafter cloned into
pET28 (+) vector and expressed in E.coli BL21 cells, and the recombinant protein purified by His-tag affinity chromatography.
The recombinant PrQM was detected as a single band of expected molecular weight of 29 kDa in SDS-PAGE. Polyclonal PrQM
antibody was generated in Swiss-albino rats and western blotting studies recognized a polypeptide with a molecular weight of
26 kDa, relating to the endogenous PrQM protein, consistent with the theoretical molecular size. The anti-PrQM antibody was
ultimately used to understand sub-cellular localization of the PrQM in infection models of Pieris rapae larvae.
Bharat Bhusan Patnaik has completed his doctorate from University of Madras in the year 2005 and is the recipient of International Scholar Exchange
Fellowship by Korea Foundation for Advanced Studies for the year 2011-12. He has also served as UGC-NRCBS Visiting Fellow to Madurai Kamaraj
University, Madurai and received the Indian Academies of Science Fellowship for Teachers to Visva-Bharathi University, Santiniketan. He has
published quality papers in International and National journals and is a reviewer to Elsevier and academic journals.
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