Molecular Identification of Marine Symbiont Bacteria of Gastropods from the Waters of the Krakal Coast Yogyakarta and Its Potential as a Multi-drug Resistant (MDR) Antibacterial Agent

The resistance of pathogenic bacteria may occur to many types of antibiotics, especially in cases of noncompliance use of antibiotics, which likely to allow the evolution of Multi-Drug Resistant (MDR) bacteria. Gastropods seas are marine invertebrates informed capable of production of secondary metabolites as antibacterial MDR. The purpose of the study was the isolation and identification of gastropod symbiont bacteria found in the waters of Krakal, Gunung Kidul, Yogyakarta, which has the ability to produce antibacterial compounds against MDR(Escherichia coli, Enterobacter cloacae, Klebsiella pneumoniae, MRSA (methicillin-Resistant Staphylococcus aureus), Staphylococcus aureus, and Staphylococcus homunis) molecular. Stages of this research began with the isolation of bacteria, bacteria screening for anti-MDR compound, mass culture, and extraction, antibacterial activity test, DNA extraction, amplification by PCR 16S rDNA and sequencing. The results of the study showed that 19 isolates of bacteria were isolated from three species of gastropods namely Littorina scabra, Cypraea moneta and Conus ebraeus. Among them, 4 isolates showed activity against MDR test bacteria (E. coli, E. cloacae, K. pneumoniae, S. aureus and S. homunis). The highest activity was displayed by code LS.G1.8 isolate with the largest inhibition zone 15.47 +/- 0.45mm on S. humonis at 250 mu g/disk concentration. Isolate CM.G2.1 showed largest inhibition zone, with 21.5 +/- 0.07mm on MRSA at 1000 mu g/disk concentration and isolate the largest inhibition zone CM.G2.5 14.37 +/- 0.81mm on MRSA 14.37 +/- 0.81mm at concentrations 1000 mu g/disk. The molecular identification of isolates LS.G1.8 has 99% homology with Bacillus subtilis and isolates CM.G2.1 has 99% homology with Bacillus pumillus.