Cyclic Electron flow

• Cyclic e- Flow 


  ONLY at P700 (PSI)
• P700 (reaction center) absorbs a photon

  • high energy e-
  • e- transferred to primary e- acceptor, the ferredoxin molecule
  • e- cycles through a cytochrome complex of ETC causing process to happen over and over again
• This separate cycle (not related to linear e- flow) 


  pumps H+, creating a gradient which creates ATP
• e- goes down ETC (separate from LEF) until it comes back to its original place P700
• summary

  • only PSI (P700)
  • e- cycled through sep system
  • H+ pumped causing gradient
  • Eventual ATP production
  • P700 creates ATP only in a cycle e- flow NOT linear e- flow
• No O2 because there is no photolysis 


  How does it fill its void? fIlled because it goes in a cycle