Expression of Vitreoscilla hemoglobin enhances production of arachidonic acid and lipids in Mortierella alpina.

Abstract:

BACKGROUND:Arachidonic acid (ARA, C20:4, n-6), which belongs to the omega-6 series of polyunsaturated fatty acids and has a variety of biological activities, is commercially produced in Mortierella alpina. Dissolved oxygen or oxygen utilization efficiency is a critical factor for Mortierella alpina growth and arachidonic acid production in large-scale fermentation. Overexpression of the Vitreoscilla hemoglobin gene is thought to significantly increase the oxygen utilization efficiency of the cells. RESULTS:An optimized Vitreoscilla hemoglobin (VHb) gene was introduced into Mortierella alpina via Agrobacterium tumefaciens-mediated transformation. Compared with the parent strain, the VHb-expressing strain, termed VHb-20, grew faster under both limiting and non-limiting oxygen conditions and exhibited dramatic changes in cell morphology. Furthermore, VHb-20 produced 4- and 8-fold higher total lipid and ARA yields than those of the wild-type strain under a microaerobic environment. Furthermore, ARA production of VHb-20 was also 1.6-fold higher than that of the wild type under normal conditions. The results demonstrated that DO utilization was significantly increased by expressing the VHb gene in Mortierella alpina. CONCLUSIONS:The expression of VHb enhances ARA and lipid production under both lower and normal dissolved oxygen conditions. This study provides a novel strategy and an engineered strain for the cost-efficient production of ARA.

journal_name

BMC Biotechnol

journal_title

BMC biotechnology

authors

Zhang H,Feng Y,Cui Q,Song X

doi

10.1186/s12896-017-0388-8

subject

Has Abstract

pub_date

2017-08-30 00:00:00

pages

68

issue

1

issn

1472-6750

pii

10.1186/s12896-017-0388-8

journal_volume

17

pub_type

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