Photosystem II: Difference between revisions

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[[Image:1s5l.gif|250px|left]]

==Background==

This structure of Photosystem II was crystallized from the cyanobacteria, ''Thermosynechococcus elongatus'', at 3.50 Å. Cyanobacteria and plants both contain Photosystem II while photosynthetic bacteria contain the bacterial reaction center. This photosynthetic protein complex is associated with a variety of functional ligands. It is a <scene name='Photosystem_II/Psii_dimer/1'>dimer</scene> composed mainly of alpha-helices. Nineteen <scene name='Photosystem_II/Protein_only/1'>subunits</scene> are in each monomer, with multiple extrinsic subunits associated with the oxygen evolving complex missing from this crystallization. Photosystem II is a membrane bound protein associated with the thylakoid membrane of chloroplasts. <scene name='Photosystem_II/Hydrophobic_polar/1'>Polar and hydrophobic</scene> regions correlate with membrane associated nature of the protein. '''Hydrophobic''' helices make up the transmembranal portion, while '''polar''' residues are concentrated externally on either side of the membrane.

This structure of Photosystem II was crystallized from the cyanobacteria, ''Thermosynechococcus elongatus'', at 3.0Å <ref>Loll, B., Kern, J., Saenger, W., Zouni, A., Biesiadka, J. "Towards complete cofactor arrangement in the 3.0 A resolution structure of photosystem II." Nature 2005, 438: 1040-1044. PMID: [http://www.ncbi.nlm.nih.gov/pubmed/16355230 16355230]</ref> and at 3.50 Å (<ref>Ferreira, K.N., Iverson, T.M., Maghlaoui, K., Barber, J., Iwata, S. "Architecture of the photosynthetic oxygen-evolving center." Science, March 19, 2004, 303 (5665), 1831-8. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/14764885 14764885]</ref>. PDB codes are [http://www.proteopedia.org/wiki/index.php/2AXT 2AXT] and [http://www.proteopedia.org/wiki/index.php/1S5L 1S5L], respectively. Cyanobacteria and plants both contain Photosystem II while photosynthetic bacteria contain the bacterial reaction center. This photosynthetic protein complex is associated with a variety of functional ligands. It is a <scene name='Photosystem_II/Psii_dimer/1'>dimer</scene> composed mainly of alpha-helices. Nineteen <scene name='Photosystem_II/Protein_only/1'>subunits</scene> are in each monomer, with multiple extrinsic subunits associated with the oxygen evolving complex missing from this crystallization. Photosystem II is a membrane bound protein complex that in plants is associated with the thylakoid membrane of chloroplasts. <scene name='Photosystem_II/Hydrophobic_polar/1'>Polar and hydrophobic</scene> regions correlate with membrane associated nature of the protein. '''Hydrophobic''' helices make up the transmembranal portion, while '''polar''' residues are concentrated externally on either side of the membrane.

==Photosynthesis==

Photosystem II: Difference between revisions

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 [[Image:1s5l.gif|250px|left]]
 ==Background==
-This structure of Photosystem II was crystallized from the cyanobacteria, ''Thermosynechococcus elongatus'', at 3.50 Å.  Cyanobacteria and plants both contain Photosystem II while photosynthetic bacteria contain the bacterial reaction center.  This photosynthetic protein complex is associated with a variety of functional ligands. It is a <scene name='Photosystem_II/Psii_dimer/1'>dimer</scene> composed mainly of alpha-helices.  Nineteen <scene name='Photosystem_II/Protein_only/1'>subunits</scene> are in each monomer, with multiple extrinsic subunits associated with the oxygen evolving complex missing from this crystallization.  Photosystem II is a membrane bound protein associated with the thylakoid membrane of chloroplasts.  <scene name='Photosystem_II/Hydrophobic_polar/1'>Polar and hydrophobic</scene> regions correlate with membrane associated nature of the protein.  '''<FONT COLOR="#616D7E">Hydrophobic</FONT>''' helices make up the transmembranal portion, while '''<FONT COLOR="#C031C7">polar</FONT>''' residues are concentrated externally on either side of the membrane.
+This structure of Photosystem II was crystallized from the cyanobacteria, ''Thermosynechococcus elongatus'', at 3.0Å <ref>Loll, B.,  Kern, J., Saenger, W., Zouni, A., Biesiadka, J. "Towards complete cofactor arrangement in the 3.0 A resolution structure of photosystem II."  Nature 2005, 438: 1040-1044. PMID: [http://www.ncbi.nlm.nih.gov/pubmed/16355230 16355230]</ref> and at 3.50 Å (<ref>Ferreira, K.N., Iverson, T.M., Maghlaoui, K., Barber, J., Iwata, S.  "Architecture of the photosynthetic oxygen-evolving center."  Science, March 19, 2004, 303 (5665), 1831-8.  PMID:[http://www.ncbi.nlm.nih.gov/pubmed/14764885 14764885]</ref>. PDB codes are [http://www.proteopedia.org/wiki/index.php/2AXT 2AXT] and [http://www.proteopedia.org/wiki/index.php/1S5L 1S5L], respectively.  Cyanobacteria and plants both contain Photosystem II while photosynthetic bacteria contain the bacterial reaction center.  This photosynthetic protein complex is associated with a variety of functional ligands. It is a <scene name='Photosystem_II/Psii_dimer/1'>dimer</scene> composed mainly of alpha-helices.  Nineteen <scene name='Photosystem_II/Protein_only/1'>subunits</scene> are in each monomer, with multiple extrinsic subunits associated with the oxygen evolving complex missing from this crystallization.  Photosystem II is a membrane bound protein complex that in plants is associated with the thylakoid membrane of chloroplasts.  <scene name='Photosystem_II/Hydrophobic_polar/1'>Polar and hydrophobic</scene> regions correlate with membrane associated nature of the protein.  '''<FONT COLOR="#616D7E">Hydrophobic</FONT>''' helices make up the transmembranal portion, while '''<FONT COLOR="#C031C7">polar</FONT>''' residues are concentrated externally on either side of the membrane.
 ==Photosynthesis==