title: Proteomic analysis of the cilia membrane of Paramecium tetraurelia.
abstract: Channels, pumps, receptors, cyclases and other membrane proteins modulate the motility and sensory function of cilia, but these proteins are generally under-represented in proteomic analyses of cilia. Studies of these ciliary membrane proteins would benefit from a protocol to greatly enrich for integral and lipidated membrane proteins. We used LC-MS/MS to compare the proteomes of unfractionated cilia (C), the ciliary membrane (CM) and the ciliary membrane in the detergent phase (DP) of Triton X-114 phase separation. 55% of the proteins in DP were membrane proteins (i.e. predicted transmembrane or membrane-associated through lipid modifications) and 31% were transmembrane. This is to be compared to 23% membrane proteins with 9% transmembrane in CM and 9% membrane proteins with 3% transmembrane in C. 78% of the transmembrane proteins in the DP were found uniquely in DP, and not in C or CM. There were ion channels, cyclases, plasma membrane pumps, Ca(2+) dependent protein kinases, and Rab GTPases involved in the signal transduction in DP that were not identified in the other C and CM preparations. Of 267 proteins unique to the DP, 147 were novel, i.e. not found in other proteomic and genomic studies of cilia.
authors.affiliation: Department of Biology, University of Vermont, Burlington, VT 05405, USA. Electronic Junji.Yano@uvm.edu
authors.forename: Junji
authors.initials: J
authors.lastname: Yano
authors.forename: Anbazhagan
authors.initials: A
authors.lastname: Rajendran
authors.forename: Megan S
authors.initials: MS
authors.lastname: Valentine
authors.forename: Madhurima
authors.initials: M
authors.lastname: Saha
authors.forename: Bryan A
authors.initials: BA
authors.lastname: Ballif
authors.forename: Judith L
authors.initials: JL
authors.lastname: Van Houten
mesh_terms: D002923:Cilia / Q000378:metabolism; D008565:Membrane Proteins / Q000378:metabolism*; D016805:Paramecium tetraurelia / Q000378:metabolism*; D020543:Proteome / Q000378:metabolism*; D040901:Proteomics; D015800:Protozoan Proteins / Q000378:metabolism*
chemical_list: D008565:Membrane Proteins; D020543:Proteome; D015800:Protozoan Proteins