Provided is an acid-resistant yeast cell that is genetically engineered to enhance activity of a radiation sensitivity complementing kinase, and a method of producing lactate by using the yeast cell.

The present invention provides a modified eukaryotic cell wherein the modified eukaryotic cell is not able to provide an SSN6-like protein that exerts its wildtype function and/or wildtype activity, the amount of SSN6-like protein being present in the modified eukaryotic cell differs from the amount of SSN6-like protein being present in its wildtype form, and/or essentially no SSN6-like protein is present in the modified cell. Additionally, the present invention provides a polynucleotide sequence comprising a modified ssn6-like gene, and a vector comprising said polynucleoptide. Additionally provided is an expression vector comprising a promoter that is repressed in the presence of SSN6-like protein, and a host cell comprising said vectors. The present invention further refers to a method for determining the purity of a composition by using the modified eukaryotic cell, to a method of expressing gene(s) of interest, and eukaryotic cells comprising modified ssn6-like gene.

The present invention provides a modified eukaryotic cell wherein the modified eukaryotic cell is not able to provide an SSN6-like protein that exerts its wildtype function and/or wildtype activity, the amount of SSN6-like protein being present in the modified eukaryotic cell differs from the amount of SSN6-like protein being present in its wildtype form, and/or essentially no SSN6-like protein is present in the modified cell. Additionally, the present invention provides a polynucleotide sequence comprising a modified ssn6-like gene, and a vector comprising said polynucleoptide. Additionally provided is an expression vector comprising a promoter that is repressed in the presence of SSN6-like protein, and a host cell comprising said vectors. The present invention further refers to a method for determining the purity of a composition by using the modified eukaryotic cell, to a method of expressing gene(s) of interest, and eukaryotic cells comprising modified ssn6-like gene.

The present invention relates to a leader peptide which promotes the secretion of recombinant proteins and a nucleic acid sequence encoding the leader peptide as well as expression cassettes, vectors and host cells comprising this leader sequence. Also disclosed is a method for producing a protein using this leader peptide.

The present invention relates to a leader peptide which promotes the secretion of recombinant proteins and a nucleic acid sequence encoding the leader peptide as well as expression cassettes, vectors and host cells comprising this leader sequence. Also disclosed is a method for producing a protein using this leader peptide.

Described herein are glucose sensors. The sensors are composed of host cells incorporating DNA devices specifically designed to produce fluorescence when the cells come into contact with glucose from a patient sample. Once the fluorescence has been quantified, it can be correlated with the amount of glucose present in the sample. Also described herein are extracts from the host cells that can sense and measure glucose levels in a patient. The devices and extracts disclosed herein are inexpensive but sensitive and accurate enough for use in both home and clinical testing situations. The devices and extracts disclosed herein are also useful for diagnosis of diabetes, pre-diabetes, or other diseases associated with elevated glucose levels.

Described herein are glucose sensors. The sensors are composed of host cells incorporating DNA devices specifically designed to produce fluorescence when the cells come into contact with glucose from a patient sample. Once the fluorescence has been quantified, it can be correlated with the amount of glucose present in the sample. Also described herein are extracts from the host cells that can sense and measure glucose levels in a patient. The devices and extracts disclosed herein are inexpensive but sensitive and accurate enough for use in both home and clinical testing situations. The devices and extracts disclosed herein are also useful for diagnosis of diabetes, pre-diabetes, or other diseases associated with elevated glucose levels.

The present invention provides a class of new mutant proteins for increasing malic acid yield. Specifically, the present invention provides a class of new pyruvate carboxylase mutant protein and malic acid transporter mutant proteins or combinations thereof, a preparation method therefor and use thereof in improving malic acid yield.

An isolated nucleic acid encoding a leader, which has a specific sequence, an isolated leader peptide encoded by such nucleic acid, an expression cassette comprising such nucleic acid encoding a leader operably linked to a nucleic acid sequence encoding a POI a recombinant yeast host cell or a vector comprising such expression cassette, a method of producing a POI in such yeast host cell, and further the use of the specific nucleic acid for the secretion of a POT from a host cell and/or to increase the secretion of a POT from a host cell.

An isolated nucleic acid encoding a leader, which has a specific sequence, an isolated leader peptide encoded by such nucleic acid, an expression cassette comprising such nucleic acid encoding a leader operably linked to a nucleic acid sequence encoding a POI a recombinant yeast host cell or a vector comprising such expression cassette, a method of producing a POI in such yeast host cell, and further the use of the specific nucleic acid for the secretion of a POT from a host cell and/or to increase the secretion of a POT from a host cell.