NDLI: Mutational analysis of a regulatory region in bacteriophage lambda that has overlapping signals for the initiation of transcription and translation.

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Specific covalent binding of platelet-derived growth factor to human plasma alpha 2-macroglobulin.

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Mutational analysis of a regulatory region in bacteriophage lambda that has overlapping signals for the initiation of transcription and translation.

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Retinal migration during dark reduction of bacteriorhodopsin.

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Mutational analysis of a regulatory region in bacteriophage lambda that has overlapping signals for the initiation of transcription and translation.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Rosenberg, M. Wulff, D. L. Mahoney, M. Shatzman, A.
Abstract	The positively regulated PRE promoter of phage lambda structurally overlaps with the ribosome-binding and NH2-terminal coding region of the regulatory protein (cII) that activates PRE transcription. We have isolated and characterized 27 different point mutations that occur within the 36-base-pair overlapping region. A comparison of genetic crossover data with nucleotide separations as determined by DNA sequence analysis reveals that recombination frequencies are greatly depressed at very short distances. Moreover, recombination frequency is critically dependent upon the precise nucleotide sequence of the crossover region for distances of five nucleotides or less. The mutations define precise positions and sequences that are important to (i) PRE promoter function, (ii) translation of the cII gene, and (iii) cII gene function. Mutational changes that affect the function of one element in this region concomitantly define phenotypically silent alterations in the other two elements. Mutations deficient in promoter function (P-RE or cy) are clustered in two regions that lie approximately equal to 10 and approximately equal to 35 nucleotides before the initial base of PRE mRNA, analogous to mutations in other promoters. P-RE mutations in the -10 region alter bases that are conserved in prokaryotic promoters, but P-RE mutations in the -35 region do not affect bases that are normally conserved in other promoters. Several mutations deficient in cII gene activity affect the initiation of cII protein synthesis, including an A leads to G change four bases outside the cII coding region, and AUG leads to GUG, AUG leads to ACG, and AUG leads to AUA mutations in the initiation codon. In the region of overlap between the PRE promoter and the NH2-terminal region of the cII gene, most amino acid substitutions in the cII protein do not result in a loss of cII function, indicating that this region of the gene does not contain essential information for cII function. We suggest that the overlap itself is an evolutionarily conserved structure and that it somehow coordinates the bidirectional transcriptional and translational events that occur in this region.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	2
Volume Number	81
Language	English
Publisher	National Academy of Sciences
Publisher Date	1984-03-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Bacteriophage Lambda Genetics Protein Biosynthesis Transcription, Genetic Gene Expression Regulation Genes Genes, Viral Mutation Operon Peptide Chain Initiation, Translational Transcription Factors Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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