Screening and purification for novel cytochrome b5 from uncultured environmental micro-organisms.
OBJECTIVE
We describe a sequence-based PCR method suitable for the isolation of a novel soluble heme-binding domain of cytochrome b(5) (cyt b(5)) gene directly from metagenomic DNA is described.


RESULTS
Using the degenerate primer set, a cyt b(5) gene was isolated directly from metagenomic DNA. Based on the sequence-based PCR method, the similar conserved motif of cyt b(5) from Rhodopseudomonas palustris strain makes the novel target gene. The gene encoding cyt b(5) was cloned and expressed in Escherichia coli BL21 (DE3) using pET expression system. The expressed recombinant enzyme was purified by Ni-nitrilotriacetic acid affinity chromatography and characterized.


CONCLUSIONS
Sequence-based strategy is an effective method for application of the novel gene from metagenomic DNA.


CONCLUSIONS
Investigation of novel genes from metagenome, most of the micro-organism species are largely untapped, could represent an interesting and useful reservoir for biological processes.
Roh
C
C
School of Chemical and Biological Engineering, Institute of Molecular Biology and Genetics, Seoul National University, Seoul, South Korea. chroh21@snu.ac.kr
Villatte
F
F
Kim
B-G
BG
Schmid
R D
RD
D015786:Cytochromes b5 / Q000235:genetics* / Q000302:isolation & purification*; D017931:DNA Primers; D015698:Genomic Library; D019015:Geologic Sediments / Q000382:microbiology*; D016133:Polymerase Chain Reaction / Q000379:methods; D012241:Rhodopseudomonas / Q000235:genetics
D017931:DNA Primers; D015786:Cytochromes b5