Light-induced COP9 signalosome expression in the Indian false vampire bat Megaderma lyra.
The COP9 signalosome (CSN) is a multi-subunit protein complex conserved in plants and animals. CSN subunits have been identified as light-mediated master regulators of eukaryotic circadian clocks from fungi to animals. The Indian false vampire bat Megaderma lyra is completely adapted to an anthropic biotope and behavioral studies have reported that M. lyra exhibits light-sampling behavior to assess environmental light. LC-MS-MS results for a 36 kDa protein were analyzed using the Sequest search engine, and COP9 signalosome subunit 5 (CSN5) was pinpointed as having the highest score with 6 matching peptides. To confirm the presence of CSN5, up-regulated cDNA was amplified, sequenced, and identified as CSN5. Furthermore, semi-quantitative RT-PCR analysis demonstrated that the level of induction of CSN5 was regulated by environmental light. We estimated the level of expression across a light-dark cycle and observed a higher level of expression at the end of the light phase. Similarly, when the animal was shifted from continuous dark to light, CSN5 expression was induced. Correspondingly, we detected the similar pattern of translated protein with JAB1 antibody. Knowledge about the circadian rhythm and its molecular mechanism in Chiroptera is very limited and this study suggests that CSN5 might be involved in the M. lyra light-signaling process.
Department of Animal Science, School of Life Sciences, Bharathidasan University, Tiruchirappalli 620024, India. emmanuvel1972@yahoo.com
K Emmanuvel
KE
Rajan
R
R
Rajkumar
Chen-Chug
CC
Liao
A
A
Ganesh
G
G
Marimuthu
D000595:Amino Acid Sequence; D000818:Animals; D001923:Brain Chemistry; D002467:Cell Nucleus / Q000378:metabolism* / Q000528:radiation effects*; D002685:Chiroptera / Q000502:physiology*; D047908:Intracellular Signaling Peptides and Proteins / Q000378:metabolism* / Q000528:radiation effects; D008027:Light; D009687:Nuclear Proteins / Q000235:genetics* / Q000528:radiation effects; D021122:Protein Subunits / Q000235:genetics; D015398:Signal Transduction / Q000235:genetics
D047908:Intracellular Signaling Peptides and Proteins; D009687:Nuclear Proteins; D021122:Protein Subunits