PMID:18060402

Citation	Inui, M, Suda, M, Kimura, S, Yasuda, K, Suzuki, H, Toda, H, Yamamoto, S, Okino, S, Suzuki, N and Yukawa, H (2008) Expression of Clostridium acetobutylicum butanol synthetic genes in Escherichia coli. Appl. Microbiol. Biotechnol. 77:1305-16
Abstract	A recombinant butanol pathway composed of Clostridium acetobutylicum ATCC 824 genes, thiL, hbd, crt, bcd-etfB-etfA, and adhe1 (or adhe) coding for acetyl-CoA acetyltransferase (THL), beta-hydroxybutyryl-CoA dehydrogenase (HBD), 3-hydroxybutyryl-CoA dehydratase (CRT), butyryl-CoA dehydrogenase (BCD), butyraldehyde dehydrogenase (BYDH), and butanol dehydrogenase (BDH), under the tac promoter control was constructed and was introduced into Escherichia coli. The functional expression of these six enzymes was proved by demonstrating the corresponding enzyme activities using spectrophotometric, high performance liquid chromatography and gas chromatography analyses. The BCD activity, which was not detected in E. coli previously, was shown in the present study by performing the procedure from cell extract preparation to activity measurement under anaerobic condition. Moreover, the etfA and etfB co-expression was found to be essential for the BCD activity. In the case of BYDH activity, the adhe gene product was shown to have higher specificity towards butyryl-CoA compared to the adhe1 product. Butanol production from glucose was achieved by the highly concentrated cells of the butanologenic E. coli strains, BUT1 with adhe1 and BUT2 with adhe, under anaerobic condition, and the BUT1 and BUT2 strains were shown to produce 4 and 16-mM butanol with 6- and 1-mM butyrate as a byproduct, respectively. This study reports the novel butanol production by an aerobically pregrown microorganism possessing the genes of a strict anaerobe, Clostridium acetobutylicum.
Links	PubMed Online version:10.1007/s00253-007-1257-5
Keywords	3-Hydroxyacyl CoA Dehydrogenases/genetics; 3-Hydroxyacyl CoA Dehydrogenases/metabolism; Acetyl-CoA C-Acetyltransferase/genetics; Acetyl-CoA C-Acetyltransferase/metabolism; Acyl Coenzyme A/genetics; Acyl Coenzyme A/metabolism; Alcohol Oxidoreductases/genetics; Alcohol Oxidoreductases/metabolism; Aldehyde Oxidoreductases/genetics; Aldehyde Oxidoreductases/metabolism; Biosynthetic Pathways; Butanols/metabolism; Butyryl-CoA Dehydrogenase/genetics; Butyryl-CoA Dehydrogenase/metabolism; Clostridium acetobutylicum/enzymology; Clostridium acetobutylicum/genetics; Escherichia coli/genetics; Genes, Bacterial; Genetic Engineering; Recombinant Proteins/genetics; Recombinant Proteins/metabolism
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Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
CLOAB:CRT		GO:0003859 : 3-hydroxybutyryl-CoA dehydratase activity	ECO:0000314:		F		Figure 3B shows 3-hydroxybutyryl-CoA dehydratase (CRT) activity Table 3 shows positive CRT activity by different strains	complete CACAO 4109

References

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