Rhodobacter capsulatus genes encoding form I ribulose-1,5-bisphosphate carboxylase/oxygenase (cbbLS) and neighbouring genes were acquired by a horizontal gene transfer (original) (raw)

Abstract

Analysis of the nucleotide sequence of the form I ribulose-1.5-bisphosphate carboxylase/oxygenase (RubisCO) genes (cbbL and ebbs) of the non-sulfur purple bacterium Rhodobacter capsulatus indicated that the deduced amino acid sequence of the large subunit was not closely homologous to the large subunit from related organisms. Indeed, phylogenetic analysis suggested that the large subunit protein (Cbbl) more closely resembled the enzyme from alpy purple bacteria and cyanobacteria and is within a 'green-like' radiation of the RubisCO phylogenetic tree, well separated from CbbL of the related organism Rhodobacter sphaeroides. A abbQ gene was discovered downstream of ebbs in Rh. capsulatus, a gene arrangement which also appears to be limited to certain organisms containing a 'green-like ' RubisCO. Upstream, and divergently transcribed from cbbLSQ, is a gene (cbbR,) that encodes a LysR-type transcriptional activator. Phylogenetic analysis of the deduced amino acid sequence of CbbR, also suggests that this protein is quite distinct from the Rh. sphaeroides CbbR protein, and is even distinct from the previously described CbbR,, protein, the gene of which is upstream and divergently transcribed from the ebb,, operon of Rh. capsu/atus. Interestingly, Rh. capsu/atus CbbR, is more closely related to CbbR from bacteria whose RubisCO falls within the 'greenlike' radiation of the CbbL tree. These studies suggest that the cbbR,-cbbL-cbbEcbbQ genes were acquired by Rh. capsulatus via horizontal gene transfer from a bacterial species containing a ' green-like' RubisCO.

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