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Improved pullulan production by a mutant of Aureobasidium melanogenum TN3-1 from a natural honey and capsule shell preparation.

Abstract：

:Aureobasidium melanogenum TN3-1 isolated from a natural honey was a highly genome-duplicated yeast-like fungal strain and a very high pullulan producer. In this study, simultaneous removal of both duplicated AMY1 genes encoding α-amylase and duplicated PKS1 genes responsible for melanin biosynthesis in A. melanogenum TN3-1 rendered a mutant AMY-PKS-11 to transform 140.0 g/L of glucose to produce 103.50 g/L of pigment-free pullulan with molecular weight (Mw) of 3.2 × 105 g/mol. α-Amylase activity produced by the mutant AMY-PKS-11 and expression of the AMY1 genes and PKS genes in it was reduced, but expression of various genes responsible for pullulan biosynthesis in the mutant AMY-PKS-11 was up-regulated. The produced pullulan was used to make the capsule shells successfully and the prepared pullulan capsule shells had various advantages such as high strength, good oxygen barrier properties, raw materials availability, tightness, lightness and high water resistance and may be suitable for all the consumers. Therefore, the prepared capsule shells had highly potential applications in food and pharmaceutical industries.

journal_name

Int J Biol Macromol

journal_title

International journal of biological macromolecules

authors

Chen L,Chi Z,Liu GL,Xue SJ,Wang ZP,Hu Z,Chi ZM

doi

10.1016/j.ijbiomac.2019.08.264

subject

Has Abstract

pub_date

2019-12-01 00:00:00

pages

268-277

eissn

0141-8130

issn

1879-0003

pii

S0141-8130(19)35666-1

journal_volume

141

pub_type

杂志文章

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