title: Cloning, DNA sequence, and expression of the Rhodobacter sphaeroides light-harvesting B800-850-alpha and B800-850-beta genes.
abstract: Two deoxyoligonucleotide probes were synthesized in accordance with the available amino acid sequence of the B800-850-beta polypeptide from Rhodobacter sphaeroides and were used to isolate a 2.6-kilobase PstI fragment from R. sphaeroides 2.4.1 chromosomal DNA. Identification of the B800-850-beta and B800-850-alpha structural genes, pucB and pucA, was confirmed by DNA sequencing. Northern (RNA) blot analysis, using restriction endonuclease fragments from the cloned genes as probes, revealed a single puc-operon-specific, highly stable transcript of approximately 640 bases present in photosynthetically grown cells. In vitro transcription-translation analysis of the puc operon revealed that the maximum synthesis of the puc operon gene products was achieved when the entire 2.6-kilobase PstI fragment was used as the template, although a 537-base-pair XmaIII fragment was sufficient to direct the synthesis of pucB and pucA fusion product.
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics*; D001483:Base Sequence; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D004262:DNA Restriction Enzymes; D004269:DNA, Bacterial / Q000235:genetics; D005786:Gene Expression Regulation; D005798:Genes, Bacterial; D008565:Membrane Proteins / Q000235:genetics; D009876:Operon; D010788:Photosynthesis; D045322:Photosynthetic Reaction Center Complex Proteins; D012244:Rhodospirillaceae / Q000235:genetics*
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; D008565:Membrane Proteins; D045322:Photosynthetic Reaction Center Complex Proteins; D004262:DNA Restriction Enzymes