CLONING OF A GENE ENCODING PROTEIN BELONGING TO ABC TRANSPORTER INVOLVED IN BACTERIAL MAGNETIC PARTICLE SYNTHESIS IN MAGNETOSPIRILLUM MAGNETICUM AMB-1
Vol. 16 No. 1 (2009)
Research Paper
July 29, 2011
January 11, 2024
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magnetite (Fe3
O4
), enveloped by membrane called magnetosome under micro-aerobic conditions.
Initial study of random transposon-based mutagenesis generated 62 nonmagnetic mutants of
AMB-1 in a mini-Tn5 library. In order to identify a gene involved in bacterial magnetic particle
(BMP) synthesis in the magnetic bacterium M. magneticum AMB-1, a nonmagnetic mutant from
the library designated as NMA38-4, was analyzed. h e amino acid sequence deduced from the
gene directly interrupted by transposon, ORF4 (1482 bp), showed homology to ATP binding
cassette (ABC) transporter of Mesorhizobium loti with 62 % identity and 74 % similarity. It was
strongly indicated by the occurrence of putative consensus sequence of ATP-binding motifs (ATP-
binding protein). h e ORF4 was subsequently cloned in pET-15b and the recombinant ORF4-
Histag fusion protein was heterologously expressed in Escherichia coli BL21 (DE3) pLysS. A 55 kDa
protein corresponding to the ORF4-Histag fusion protein was obtained after puriï¬ cation using
Ni-NTA column. h is is the ï¬ rst report describing a gene cluster containing gene encoding protein
belonging to ABC transporter organized in an operon which is involved in BMP synthesis.
Key words: Magnetospirillum magneticum AMB-1, Bacterial Magnetic Particle (BMP), ATP
Binding Cassette (ABC) Transporter, transposon mutagenesis.
TRI WAHYUDI, A. (2024). CLONING OF A GENE ENCODING PROTEIN BELONGING TO ABC TRANSPORTER INVOLVED IN BACTERIAL MAGNETIC PARTICLE SYNTHESIS IN MAGNETOSPIRILLUM MAGNETICUM AMB-1. BIOTROPIA, 16(1). https://doi.org/10.11598/btb.2009.16.1.62
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