title: Isolation of genomic and cDNA clones encoding bovine poly(A) binding protein II.
abstract: cDNA clones for bovine poly(A) binding protein II (PAB II) were isolated. Their sequence predicts a protein of 32.8 kDa, revising earlier estimates of molecular mass. The protein contains one putative RNA-binding domain of the RNP type, an acidic N-terminal and a basic C-terminal domain. Analyses of authentic PAB II were in good agreement with all predictions from the cDNA sequence except that a number of arginine residues appeared to be post-translationally modified. Poly(A) binding protein II expressed in Escherichia coli was active in poly(A) binding and reconstitution of processive polyadenylation, including poly(A) tail length control. The cDNA clones showed a number of potential PAB II binding sites in the 3' untranslated sequence. Bovine poly(A)+RNA contained two mRNAs hybridizing to a PAB II-specific probe. Analysis of a genomic clone revealed six introns in the coding sequence. The revised molecular mass led to a demonstration of PAB II oligomer formation and a reinterpretation of earlier data concerning the protein's binding to poly(A).
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002417:Cattle; D003001:Cloning, Molecular / Q000379:methods; D003432:Cross-Linking Reagents; D018076:DNA, Complementary / Q000235:genetics*; D004926:Escherichia coli / Q000235:genetics; D008969:Molecular Sequence Data; D008970:Molecular Weight; D011061:Poly A / Q000378:metabolism; D039102:Poly(A)-Binding Proteins; D012333:RNA, Messenger / Q000235:genetics; D016601:RNA-Binding Proteins / Q000737:chemistry* / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis; D015183:Restriction Mapping; D017421:Sequence Analysis; D017422:Sequence Analysis, DNA; D013388:Succinimides
chemical_list: D003432:Cross-Linking Reagents; D018076:DNA, Complementary; D039102:Poly(A)-Binding Proteins; D012333:RNA, Messenger; D016601:RNA-Binding Proteins; D011993:Recombinant Fusion Proteins; D013388:Succinimides; D011061:Poly A; C011240:dithiobis(succinimidylpropionate); C019358:disuccinimidyl suberate