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Research Papers

A developmentally regulated chromosomal origin of replication uses essential transcription elements.

Department of Developmental Biology, Beckman Center, Stanford University School of Medicine, California 94305-5427, USA.

Abstract

Only one of the two chromosomes in the asymmetric Caulobacter predivisional cell initiates replication in the progeny cells. Transcription from a strong promoter within the origin occurs uniquely from the replication-competent chromosome at the stalked pole of the predivisional cell. This regulated promoter has an unusual sequence organization, and transcription from this promoter is essential for regulated (cell type-specific) replication. Our analysis defines a new class of bacterial origins and suggests a coupling between transcription and replication that is consistent with the phylogenetic relationship of Caulobacter to the ancestral mitochondrion.

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