Danisco US Inc.

Paula Johanna Maria Teunissen

Vivek Sharma

Jayarama K Shetty

Kathleen A Clarkson

Bo Zhang

Martijn Scheffers

Sung Ho Lee

Casper Vroemen

Ling Hua

Jing Ge

Zhongmei Tang

Marco Van Brussel-Zwijnen

Quinn Qun Zhu

Gopal K Chotani

Michael Jay Pepsin

Jacquelyn A Huitink

William Albert Cuevas

Anthony R Calabria

Gang Duan

Daniel Joseph Macool

Bruce A Strohm

Min Qi

Ying Qian

Hongxian Xu

Martien H Bergsma

Martijn Silvan Scheffers

Described are compositions and methods relating to modified yeast that over-express polyadenylate-binding protein (PAB1). The yeast produces a deceased amount of acetate compared to parental cells. Such yeast is particularly useful for large-scale ethanol production from starch substrates where acetate in an undesirable end product.

Reduction in acetate production by yeast over-expressing PAB1

Methods are provided for saccharifying a starch substrate, comprising contacting the starch substrate with a glucoamylase consisting or comprising of the amino acid sequence ofglucoamylase (Fv-GA) and further contacting the starch substrate with at least one additional glucoamylase. Additional methods are provided for saccharifying and fermenting a starch substrate to produce an end product, a biochemical end product and a fermentable beverage using a combination of Fv-GA and at least one additional glucoamylase.

Methods for saccharifying a starch subtrate

Methods for saccharifying a starch substrate

A fungal &#x3b1;-amylase is provided from(AcAmy1). AcAmy1 has an optimal pH of 4.5 and is operable at 30-75&#xb0; C., allowing the enzyme to be used in combination with a glucoamylase in a saccharification reaction. This obviates the necessity of running a saccharification reaction as a batch process, where the pH and temperature must be readjusted for optimal use of the &#x3b1;-amylase or glucoamylase. AcAmy1 also catalyzes the saccharification of starch substrates to an oligosaccharide composition significantly enriched in DP2 and (DP1+DP2) compared to the products of saccharification catalyzed by an &#x3b1;-amylase from. This facilitates the utilization of the oligosaccharide composition by a fermenting organism in a simultaneous saccharification and fermentation process, for example.

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Embodiments of the present disclosure relate to a process for producing isoprenoid precursor molecules and/or isoprenoids from a starch substrate by saccharification and/or fermentation. The saccharification is effectively catalyzed by a glucoamylase at a pH in the range of 5.0 to 8.0. At a pH of 6.0 or above, the glucoamylase possesses at least 50% activity relative to its maximum activity. The saccharification and fermentation may be performed as a simultaneous saccharification and fermentation (SSF) process.

Production of isoprenoids under neutral pH conditions

A fungal &#x3b1;-amylase is provided from(AcAmyl). AcAmyl has an optimal pH of 4.5 and is operable at 30-75&#xb0; C., allowing the enzyme to be used in combination with a glucoamylase in a saccharification reaction. This obviates the necessity of running a saccharification reaction as a batch process, where the pH and temperature must be readjusted for optimal use of the &#x3b1;-amylase or glucoamylase. AcAmyl also catalyzes the saccharification of starch substrates to an oligosaccharide composition significantly enriched in DP2 and (DP1+DP2) compared to the products of saccharification catalyzed by an &#x3b1;-amylase from. This facilitates the utilization of the oligosaccharide composition by a fermenting organism in a simultaneous saccharification and fermentation process, for example.

Embodiments of the present disclosure relate to a process for producing downstream products, such as high-density glucose syrups and high-glucose fermentation feedstock, from a starch-containing substrate without a pH adjustment before the saccharification step. The saccharification is effectively catalyzed by a glucoamylase at a pH in the range of 5.2 to 5.6.

Single pH process for starch liquefaction and saccharification for high-density glucose syrups

Growing community of inventors

Saratoga, CA, United States of America

Paula Johanna Maria Teunissen