title: Association of poly(adenylate)-deficient messenger ribonucleic acid with membranes in mouse kidney.
abstract: To describe further the metabolism of messenger ribonucleic acid (mRNA) in mouse kidney, we examined newly synthesized mRNA deficient in poly(adenylate) [poly(A)]. Approximately 50% of renal polysomal mRNA that labeled selectively in the presence of the pyrimidine analogue 5-fluoroorotic acid lacks or is deficient in poly(A) as defined by its ability to bind to poly(A) affinity columns. Nearly one-half of this poly(A)-deficient mRNA is associated uniquely with a cellular membrane fraction detected by sedimentation of renal cytoplasm in sucrose density gradients containing EDTA and nonionic detergents. Poly(A+) mRNA and poly(A)-deficient mRNA [poly(A-) mRNA] have similar modal sedimentation coefficients (20-22 S) and similar cytoplasmic distribution. Although 95% of newly synthesized poly(A+) mRNA is released in 10 mM EDTA as 20-90 S ribonucleoproteins from polysomes greater than 80 S, only 55% of poly(A)-deficient mRNA is released under the same conditions. Poly(A)-deficient mRNA recovered from greater than 80 S ribonucleoproteins resistant to EDTA treatment lacks ribosomal RNA, is similar in size to poly(A+) mRNA, and is associated with membranous structures, since 70% of poly(A)-deficient mRNA in EDTA-resistant ribonucleoproteins is released into the 20-80 S region by solubilizing membranes with 1% Triton X-100. These membrane-associated renal poly(A-) mRNAs could have unique coding or regulatory functions.
mesh_terms: D000818:Animals; D002462:Cell Membrane / Q000378:metabolism; D007668:Kidney / Q000378:metabolism*; D008297:Male; D051379:Mice; D009963:Orotic Acid / Q000031:analogs & derivatives / Q000494:pharmacology; D011061:Poly A / Q000302:isolation & purification / Q000378:metabolism; D011132:Polyribosomes / Q000378:metabolism; D012333:RNA, Messenger / Q000302:isolation & purification / Q000378:metabolism*; D012335:RNA, Ribosomal / Q000378:metabolism*
chemical_list: D012333:RNA, Messenger; D012335:RNA, Ribosomal; D011061:Poly A; D009963:Orotic Acid; C001242:5-fluoroorotic acid