Sirkka Keränen

Title: Sirkka Keränen: Innovator in Recombinant-DNA Technology

Introduction

Sirkka Keränen is a prominent inventor based in Helsinki, Finland. She has made significant contributions to the field of biotechnology, particularly through her work in recombinant-DNA technology. With a total of 2 patents, her innovations focus on enhancing the production of valuable compounds using genetically modified yeast strains.

Latest Patents

One of her latest patents is titled "Production of ethanol from xylose." This invention relates to recombinant-DNA technology and introduces new recombinant yeast strains transformed with xylose reductase and/or xylitol dehydrogenase enzyme genes. A yeast strain transformed with the xylose reductase gene is capable of reducing xylose to xylitol, thereby producing xylitol in vivo. When both genes are transformed into a yeast strain, the resultant strain can produce ethanol on xylose-containing medium during fermentation. Additionally, these new yeast strains can express the two enzymes, with xylose reductase being useful in an enzymatic process for producing xylitol in vitro.

Another significant patent by Keränen is "Increased production of secreted proteins by recombinant yeast cells." This invention also pertains to recombinant-DNA technology and involves new recombinant yeast cells transformed with the SEB1 gene. Yeast cells that are transformed with multiple copies of the SEB1 gene or that overexpress the Seb1 protein exhibit an increased capacity to produce secreted foreign or endogenous proteins. Furthermore, these new recombinant cells can utilize appropriate macromolecular compounds more efficiently, resulting in increased cell mass production and enhanced versatility in biotechnical applications.

Career Highlights

Throughout her career, Sirkka Keränen has worked with notable organizations such as Valtion Teknillinen Tutkimuskeskus and Xyrofin Oy. Her work in these institutions has allowed her to advance her research and contribute to the field of biotechnology significantly.

Collaborations

Sirkka has collaborated with esteemed colleagues, including Johan Hallborn and Heikki Ojamo. These partnerships have fostered innovation and have been instrumental in her research endeavors.

Conclusion

Sirkka Keränen's contributions to recombinant-DNA technology and her innovative patents highlight her role as a leading inventor in the biotechnology field. Her work continues to influence advancements in the production of ethanol and secreted proteins, showcasing the potential of genetically