Biology Reference
In-Depth Information
CHAPTER SEVEN
Assembly and Export of
Extracellular Polymeric
Substances (EPS) in
Cyanobacteria: A Phylogenomic
Approach
Sara B. Pereira * , Rita Mota * , Catarina L. Santos * , Roberto De
Philippis , Paula Tamagnini * , , 1
*IBMC - Instituto de Biologia Molecular e Celular, Universidade do Porto, Porto, Portugal
Faculdade de Ciências, Departamento de Biologia, Universidade do Porto, Porto, Portugal
Department of Agricultural Biotechnology, University of Florence, Florence, Italy
1 Corresponding author: E-mail: pmtamagn@ibmc.up.pt
Contents
1. Introduction
236
2. ConservedMechanismsofBacterialEPSProduction
238
2.1. Wzy-DependentPathway
239
2.2. ABC-DependentPathway
240
2.3. RoleofPCPandOPXProteinsinEPSAssemblyandExport
240
2.3.1. Characteristics of the PCP proteins
240
2.3.2. Characteristics of the OPX proteins
242
2.4. OrganizationandPhylogenyofGeneClustersInvolved
inEPSBiosynthesis
243
3. GeneticsofCyanobacterialEPSProduction:CurrentKnowledge
245
3.1. PhylogenyofGenesEncodingProteinsInvolved
inCyanobacterialEPSAssemblyandExport
247
3.1.1. Reconstruction of the PCP evolutionary history in cyanobacteria
259
3.1.2. Reconstruction of the OPX evolutionary history
in cyanobacteria
269
4. ConcludingRemarksandFuturePerspectives
273
Abstract
Many cyanobacterial strains produce extracellular polymeric substances (EPS),mainly
composedofpolysaccharidesthatcanremainassociatedtothecellorbereleasedinto
thesurroundingenvironment(releasedpolysaccharides(RPS)).Theparticularcharacter-
isticsoftheseEPS,suchasthepresenceoftwodifferenturonicacids,sulphategroups
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