Abstract:
:Vasopressin is a peptide hormone that regulates renal water excretion in part through its actions on the collecting duct. The regulation occurs in part via control of transcription of genes coding for the water channels aquaporin-2 (Aqp2) and aquaporin-3 (Aqp3). To identify transcription factors expressed in collecting duct cells, we have carried out LC-MS/MS-based proteomic profiling of nuclei isolated from native rat inner medullary collecting ducts (IMCDs). To maximize the number of proteins identified, we matched spectra to rat amino acid sequences using three different search algorithms (SEQUEST, InsPecT, and OMSSA). All searches were coupled to target-decoy methodology to limit false-discovery identifications to 2% of the total for single-peptide identifications. In addition, we developed a computational tool (ProMatch) to identify and eliminate ambiguous identifications. With this approach, we identified >3,500 proteins, including 154 proteins classified as "transcription factor" proteins (Panther Classification System). Among these, are members of CREB, ETS, RXR, NFAT, HOX, GATA, EBOX, EGR, MYT1, KLF, and CP2 families, which were found to have evolutionarily conserved putative binding sites in the 5'-flanking region or first intron of the Aqp2 gene, as well as members of EBOX, NR2, GRE, MAZ, KLF, and SP1 families corresponding to conserved sites in the 5'-flanking region of the Aqp3 gene. In addition, several novel phosphorylation sites in nuclear proteins were identified using the neutral loss-scanning LC-MS(3) technique. The newly identified proteins have been incorporated into the IMCD Proteome Database (http://dir.nhlbi.nih.gov/papers/lkem/imcd/).
journal_name
Physiol Genomicsjournal_title
Physiological genomicsauthors
Tchapyjnikov D,Li Y,Pisitkun T,Hoffert JD,Yu MJ,Knepper MAdoi
10.1152/physiolgenomics.00148.2009subject
Has Abstractpub_date
2010-02-04 00:00:00pages
167-83issue
3eissn
1094-8341issn
1531-2267pii
00148.2009journal_volume
40pub_type
杂志文章abstract::Epistasis effects (gene interactions) have been increasingly recognized as important genetic factors underlying complex traits. The existence of a large number of single nucleotide polymorphisms (SNPs) provides opportunities and challenges to screen DNA variations affecting complex traits using a candidate gene analys...
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