Molecular Characterization of a Newly Identified Subfamily Member of Penaeidin from two Penaeid Shrimps, Fenneropenaeus indicus and Metapenaeus monoceros.

Penaeidins are a major group of antimicrobial peptides found in penaeid shrimps. This study reports a new isoform of penaeidin from the hemocytes of Indian white shrimp, Fenneropenaeus indicus (Fi-PEN, JX657680), and the pink shrimp, Metapenaeus monoceros (Mm-PEN, KF275674). Mm-PEN is also the first antimicrobial peptide to be identified from M.

Molecular identification and characterization of Type I crustin isoforms from the hemocytes of portunid crabs, Scylla tranquebarica and Portunus pelagicus.

Crustins are cationic antimicrobial peptides of ca. 7-14kDa with a characteristic four-disulphide core containing WAP domain, present in the hemocytes of crustaceans. The present study reports the first crustin sequences from two portunid crabs, viz.

Two isoforms of anti-lipopolysaccharide factors identified and characterized from the hemocytes of portunid crabs, Portunus pelagicus and Scylla tranquebarica.

Anti-lipopolysaccharide factors (ALFs), a type of cationic antimicrobial peptides (AMPs), and their derivatives are becoming predominant candidates for potential drugs in viral and bacterial diseases. This study reports the first ALF from the mud crab Scylla tranquebarica (StALF, JQ899453) and the second ALF isoform from the blue swimmer crab Portunus pelagicus (PpALF2, JQ899452). Both sequences encoded for precursor molecules, starting with a signal peptide containing 26 amino acid residues, followed by a highly cationic mature peptide, containing two conserved cysteine residues flanking a putative lipopolysaccharide (LPS)-binding domain.

Molecular characterization and phylogenetic analysis of two antimicrobial peptides: Anti-lipopolysaccharide factor and crustin from the brown mud crab, Scylla serrata.

AMPs are evolutional weapons, widely used by animals and plants in their innate immune system to fend off invading microbes. The present study reports characterization of a new ALF isoform (Sc-ALF; HQ638024) and the first crustin (Sc-crustin; HQ638025) from the mud crab, Scylla serrata. The full-length cDNA of Sc-ALF consisted of 477 bp with an ORF of 123 amino acids and a putative signal peptide of 26 amino acids.