Cloning of a cDNA encoding a human DNA-binding protein similar to ribosomal protein S1.
We report the cloning of a human complementary DNA that encodes a protein which exhibits 36% identity and 62% similarity to Escherichia coli ribosomal protein S1 (rpS1), including conservation of four copies of an RNA-binding domain. This clone was obtained by ligand-screening a lambda gt11 expression library with a DNA probe derived from the CYBB gene promoter. Electrophoretic mobility shift and Southwestern blot assays confirm DNA binding activity of the protein, which exhibits preferential binding to single-stranded and double-stranded DNA and a low binding affinity for RNA. Hence, the rpS1 protein domain previously identified as an RNA-binding motif can also serve as a DNA-binding domain.
Eklund
E A
EA
Herman B Wells Center for Pediatric Research, Department of Pediatrics, Indiana University School of Medicine, Indianapolis 46202, USA.
Lee
S W
SW
Skalnik
D G
DG
D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics*; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000302:isolation & purification; D006801:Humans; D008969:Molecular Sequence Data; D012269:Ribosomal Proteins / Q000235:genetics*
D018076:DNA, Complementary; D004268:DNA-Binding Proteins; D012269:Ribosomal Proteins; C015494:ribosomal protein S1