A novel locus for mycelial aggregation forms a gateway to improved Streptomyces cell factories.

Abstract:

BACKGROUND:Streptomycetes produce a plethora of natural products including antibiotics and anticancer drugs, as well as many industrial enzymes. Their mycelial life style is a major bottleneck for industrial exploitation and over decades strain improvement programs have selected production strains with better growth properties. Uncovering the nature of the underlying mutations should allow the ready transfer of desirable traits to other production hosts. RESULTS:Here we report that the mat gene cluster, which was identified through reverse engineering of a non-pelleting mutant selected in a chemostat, is key to pellet formation of Streptomyces lividans. Deletion of matA or matB, which encode putative polysaccharide synthases, effects mycelial metamorphosis, with very small and open mycelia. Growth rate and productivity of the matAB null mutant were increased by over 60% as compared to the wild-type strain. CONCLUSION:Here, we present a way to counteract pellet formation by streptomycetes, which is one of the major bottlenecks in their industrial application. The mat locus is an ideal target for rational strain design approaches aimed at improving streptomycetes as industrial production hosts.

journal_name

Microb Cell Fact

journal_title

Microbial cell factories

authors

van Dissel D,Claessen D,Roth M,van Wezel GP

doi

10.1186/s12934-015-0224-6

subject

Has Abstract

pub_date

2015-04-01 00:00:00

pages

44

issn

1475-2859

pii

10.1186/s12934-015-0224-6

journal_volume

14

pub_type

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