TAILIEUCHUNG - Báo cáo khoa học: Homologous expression of a bacterial phytochrome The cyanobacterium Fremyella diplosiphon incorporates biliverdin as a genuine, functional chromophore

Bacteriophytochromes constitute a light-sensing subgroup of sensory kin-ases with a chromophore-binding motif in the N-terminal half and a C-ter-minally located histidine kinase activity. The cyanobacteriumFremyella diplosiphon(also designated Calothrixsp.) expresses two sequentially very similar bacteriophytochromes, cyanobacterial phytochrome A (CphA) and cyanobacterial phytochrome B (CphB). | ễFEBS Journal Homologous expression of a bacterial phytochrome The cyanobacterium Fremyella diplosiphon incorporates biliverdin as a genuine functional chromophore Benjamin Quest1 z Thomas Hubschmann2 Shivani Sharda1 Nicole Tandeau de Marsac3 and Wolfgang Gartner1 1 Max-Planck-Institute for Bioinorganic Chemistry Mulheim Germany 2 Institute for Biology Humboldt-University Berlin Germany 3 Unite des Cyanobacteries Departement de Microbiologie Institut Pasteur URA-CNRS 2172 Paris France Keywords bacteriophytochrome biliverdin IXa photoreceptor phycocyanobilin two-component signal transduction Correspondence W. Gartner Max-Planck-Institute for Bioinorganic Chemistry Stiftstr. 34-36 D-45470 Mulheim Germany Fax 49 208306 3951 Tel 49 208306 3693 E-mail gaertner@ Present address Institut de Biologie Structurale Jean Pierre Ebel UMR5075 CNRS-CEA-UJF Grenoble France Received 5 October 2006 revised 17 January 2007 accepted 20 February 2007 doi Bacteriophytochromes constitute a light-sensing subgroup of sensory kinases with a chromophore-binding motif in the N-terminal half and a C-ter-minally located histidine kinase activity. The cyanobacterium Fremyella diplosiphon also designated Calothrix sp. expresses two sequentially very similar bacteriophytochromes cyanobacterial phytochrome A CphA and cyanobacterial phytochrome B CphB . Cyanobacterial phytochrome A has the canonical cysteine residue by which covalent chromophore attachment is accomplished in the same manner as in plant phytochromes however its paralog cyanobacterial phytochrome B carries a leucine residue at that position. On the basis of in vitro experiments that showed for both cyanobacterial phytochrome A and cyanobacterial phytochrome B light-induced autophosphorylation and phosphate transfer to their cognate response regulator proteins RcpA and RcpB Hubschmann T Jorissen HJMM Borner T Gartner W deMarsac Nt 2001 Eur J Biochem 268 3383-3389 we aimed at the .

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