International Journal of Biological Sciences

Impact factor

ISSN 1449-2288

News feeds of IJBS published articles
Manuscript login

open access Global reach, higher impact

Journal of Genomics in PubMed Central. Submit manuscript now...


International Journal of Medical Sciences

Journal of Cancer

Journal of Genomics


PubMed Central Indexed in Journal Impact Factor

Int J Biol Sci 2010; 6(4):361-370. doi:10.7150/ijbs.6.361

Research Paper

Regulation of Vid-dependent degradation of FBPase by TCO89, a component of TOR Complex 1

Yan Yan1, 2 , Bin Kang3

1. Intercollege Program in Genetics, College of Medicine, the Pennsylvania State University, Hershey, Pennsylvania 17033, USA
2. Intercollege Program in Cell Developmental Biology, the Pennsylvania State University, University Park, Pennsylvania 16802, USA
3. Department of Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA


A pivotal gluconeogenic enzyme in Saccharomyces cerevisuae, fructose-1, 6-bisphosphatase (FBPase) was selectively turned over in vacuole via Vid (vacuole import and degradation) dependent pathway in response to the fresh glucose after chronic glucose starvation. TCO89, a novel and unique component of Tor Complex I (TORCI), was found to physically associate with FBPase and significantly affect FBPase degradation via Vid pathway. Further investigation indicated that Δtco89 mutant strongly impaired FBPase's importing into Vid vesicles and Vid24's association with Vid vesicles. Inactivation of TORCI by rapamycin treatment strongly blocked FBPase degradation. Other components of TORCI were also found to physically associate with FBPase. The P1S mutation of FBPase, reported to block its degradation, was observed to impair the association of FBPase with TORCI components. These results implicated an important regulatory role of TCO89 and TORCI in this pathway.

Keywords: FBPase, Vid, Tor Complex 1, TCO89, Protein degradation

This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY-NC) License. See for full terms and conditions.
How to cite this article:
Yan Y, Kang B. Regulation of Vid-dependent degradation of FBPase by TCO89, a component of TOR Complex 1. Int J Biol Sci 2010; 6(4):361-370. doi:10.7150/ijbs.6.361. Available from