Enhanced protein secretion from insect cells by co-expression of the chaperone calreticulin and translation initiation factor eIF4E.

Abstract:

:Host protein synthesis is shut down in the lytic baculovirus expression vector system (BEVS). This also affects host proteins involved in routing secretory proteins through the endoplasmic reticulum (ER)-Golgi system. It has been demonstrated that a secretory alkaline phosphatase-EGFP fusion protein (SEFP) can act as a traceable and sensitive secretory reporter protein in BEVS. In this study, a chaperone, calreticulin (CALR), and the translation initiation factor eIF4E were co-expressed with SEFP using a bicistronic baculovirus expression vector. We observed that the intracellular distribution of SEFP in cells co-expressing CALR was different from co-expressing eIF4E. The increased green fluorescence emitted by cells co-expressing CALR had a good correlation with the abundance of intracellular SEFP protein and an unconventional ER expansion. Cells co-expressing eIF4E, on the other hand, showed an increase in extracellular SEAP activity compared to the control. Utilization of these baculovirus expression constructs containing either eIF4E or CALR offers a significant advantage for producing secreted proteins for various biotechnological and therapeutic applications.

journal_name

Mol Biotechnol

journal_title

Molecular biotechnology

authors

Teng CY,Chang SL,van Oers MM,Wu TY

doi

10.1007/s12033-012-9545-4

subject

Has Abstract

pub_date

2013-05-01 00:00:00

pages

68-78

issue

1

eissn

1073-6085

issn

1559-0305

journal_volume

54

pub_type

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