Design and construction of improved new vectors for Zymomonas mobilis recombinants.

Abstract:

:Zymomonas mobilis is a very important gram-negative bacterium having a potential application to simultaneous co-production of biofuel and other high value-added products through biorefinery process technology development. Up to now, pLOI193 has been used as the plasmid of choice for Z. mobilis strains. However, its application has been limited due to its relatively low transformation efficiency, a large plasmid size (13.4 kb), and limited choice of cloning sites for gene manipulations. Some of these limitations can be overcome by the newly designed and constructed plasmid pHW20a, which provides significantly higher transformation efficiency (about two orders of magnitude greater), better stability (for at least 120 generation times), and an ease of gene manipulations. The pHW20a contains three complete cis-acting genes (repA, repB, and repC) encoding the Rep proteins for primosome formation. It has the origin of replication (oriV) to ensure replication in gram-negative bacteria, two mob genes that enhances transformation efficiency, a screening marker (lacZα), expanded multiple cloning sites (MCS) that enables easy gene manipulation, and the tetracycline resistance gene (tc(r) ). The utility of screening marker, lacZα with MCS, was confirmed by the blue-white screening test. Several examples of applications of gene expression in Z. mobilis ZM4 have been demonstrated in this article by using several new pHW20a-derived plasmids and expressing the homologous genes (gfo and ppc) and the heterologous genes (bglA, mdh, and fdh1). The results show that pHW20a is a very useful new vector for construction of new Z. mobilis recombinant strains that will enable simultaneous co-production of biofuel and high value added products.

journal_name

Biotechnol Bioeng

authors

Dong HW,Bao J,Ryu DD,Zhong JJ

doi

10.1002/bit.23106

subject

Has Abstract

pub_date

2011-07-01 00:00:00

pages

1616-27

issue

7

eissn

0006-3592

issn

1097-0290

journal_volume

108

pub_type

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