Annotations: 1IZL

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1izla_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermostichus vulcanus ) [TaxId: 32053 ],	SCOPe (2.08)
O [auth J]	d1izlj_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermostichus vulcanus ) [TaxId: 32053 ],	SCOPe (2.08)
B	d1izlb_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermosynechococcus vestitus BP-1 ) [TaxId: 197221 ],	SCOPe (2.08)
P [auth L]	d1izll_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermosynechococcus vestitus BP-1 ) [TaxId: 197221 ],	SCOPe (2.08)
S [auth P]	d1izlp_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermosynechococcus vestitus BP-1 ) [TaxId: 197221 ],	SCOPe (2.08)
E	d1izle_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermosynechococcus vestitus BP-1 ) [TaxId: 197221 ],	SCOPe (2.08)
T [auth Q]	d1izlq_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermosynechococcus vestitus BP-1 ) [TaxId: 197221 ],	SCOPe (2.08)
F	d1izlf_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermosynechococcus vestitus BP-1 ) [TaxId: 197221 ],	SCOPe (2.08)
U [auth R]	d1izlr_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermosynechococcus vestitus BP-1 ) [TaxId: 197221 ],	SCOPe (2.08)
G	d1izlg_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermosynechococcus vestitus BP-1 ) [TaxId: 197221 ],	SCOPe (2.08)
V [auth S]	d1izls_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermosynechococcus vestitus BP-1 ) [TaxId: 197221 ],	SCOPe (2.08)
H	d1izlh_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermosynechococcus vestitus BP-1 ) [TaxId: 197221 ],	SCOPe (2.08)
W [auth T]	d1izlt_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermosynechococcus vestitus BP-1 ) [TaxId: 197221 ],	SCOPe (2.08)
I	d1izli_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermosynechococcus vestitus BP-1 ) [TaxId: 197221 ],	SCOPe (2.08)
Y	d1izly_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermosynechococcus vestitus BP-1 ) [TaxId: 197221 ],	SCOPe (2.08)
K [auth O]	d1izlo_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermosynechococcus vestitus BP-1 ) [TaxId: 197221 ],	SCOPe (2.08)
M [auth V]	d1izlv_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermostichus vulcanus ) [TaxId: 32053 ],	SCOPe (2.08)
AA [auth 0]	d1izl0_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermostichus vulcanus ) [TaxId: 32053 ],	SCOPe (2.08)
N [auth X]	d1izlx_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermosynechococcus vestitus BP-1 ) [TaxId: 197221 ],	SCOPe (2.08)
BA [auth 1]	d1izl1_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermosynechococcus vestitus BP-1 ) [TaxId: 197221 ],	SCOPe (2.08)
R [auth N]	d1izln_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermosynechococcus vestitus BP-1 ) [TaxId: 197221 ],	SCOPe (2.08)
D	d1izld_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermosynechococcus vestitus BP-1 ) [TaxId: 197221 ],	SCOPe (2.08)
Q [auth M]	d1izlm_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermosynechococcus vestitus BP-1 ) [TaxId: 197221 ],	SCOPe (2.08)
C	d1izlc_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermosynechococcus vestitus BP-1 ) [TaxId: 197221 ],	SCOPe (2.08)
Z	d1izlz_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermosynechococcus vestitus BP-1 ) [TaxId: 197221 ],	SCOPe (2.08)
L [auth U]	d1izlu_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermosynechococcus vestitus BP-1 ) [TaxId: 197221 ],	SCOPe (2.08)
X [auth W]	d1izlw_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermosynechococcus vestitus BP-1 ) [TaxId: 197221 ],	SCOPe (2.08)
J [auth K]	d1izlk_	Low resolution protein structures	Photosystems	Photosystems	Photosystems	Photosystem II	(Thermosynechococcus vestitus BP-1 ) [TaxId: 197221 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
B	SCOP2B Superfamily	Photosystem II antenna protein-like	8032743	3001674	SCOP2B (2022-06-29)
P [auth L]	SCOP2B Superfamily	Photosystem II antenna protein-like	8032743	3001674	SCOP2B (2022-06-29)
R [auth N]	SCOP2B Superfamily	Bacterial photosystem II reaction centre, L and M subunits	8032750	3000736	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	Bacterial photosystem II reaction centre, L and M subunits	8032750	3000736	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	HORMA	e1izlA2	A: a/b three-layered sandwiches	X: Subtilisin-like	H: Subtilisin-like	T: Subtilisin-like	F: HORMA	ECOD (v294.1)
O [auth J]	Biotin_carb_N	e1izlJ2	A: a/b three-layered sandwiches	X: Fusion glycoprotein F2	H: MoeA-I/Ornithine decarboxylase-C/Reverse ferredoxin-like domain in RNA-polymerase	T: PreATP-grasp domain	F: Biotin_carb_N	ECOD (v294.1)
B	JmjC_2	e1izlB1	A: a/b three-layered sandwiches	X: Single-stranded left-handed beta-helix	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: JmjC_2	ECOD (v294.1)
P [auth L]	AWS	e1izlL2	A: a/b three-layered sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: AWS	ECOD (v294.1)
T [auth Q]	DHDPS	e1izlQ1	A: a/b three-layered sandwiches	X: Lipocalins/Streptavidin	H: SH3	T: Transmembrane protein 14A	F: DHDPS	ECOD (v294.1)
F	DHDPS	e1izlF1	A: a/b three-layered sandwiches	X: Lipocalins/Streptavidin	H: SH3	T: Transmembrane protein 14A	F: DHDPS	ECOD (v294.1)
M [auth V]	DHDPS	e1izlV1	A: a/b three-layered sandwiches	X: Lipocalins/Streptavidin	H: SH3	T: Transmembrane protein 14A	F: DHDPS	ECOD (v294.1)
AA [auth 0]	DHDPS	e1izl01	A: a/b three-layered sandwiches	X: Lipocalins/Streptavidin	H: SH3	T: Transmembrane protein 14A	F: DHDPS	ECOD (v294.1)
R [auth N]	HORMA	e1izlN3	A: a/b three-layered sandwiches	X: Subtilisin-like	H: Subtilisin-like	T: Subtilisin-like	F: HORMA	ECOD (v294.1)
D	Biotin_carb_N	e1izlD2	A: a/b three-layered sandwiches	X: Fusion glycoprotein F2	H: MoeA-I/Ornithine decarboxylase-C/Reverse ferredoxin-like domain in RNA-polymerase	T: PreATP-grasp domain	F: Biotin_carb_N	ECOD (v294.1)
Q [auth M]	LHC	e1izlM1	A: a/b three-layered sandwiches	X: Suppressor of Fused, C-terminal domain	H: HTH	T: winged helix domain	F: LHC	ECOD (v294.1)
C	LHC	e1izlC1	A: a/b three-layered sandwiches	X: Suppressor of Fused, C-terminal domain	H: HTH	T: winged helix domain	F: LHC	ECOD (v294.1)
X [auth W]	DHDPS	e1izlW1	A: a/b three-layered sandwiches	X: Lipocalins/Streptavidin	H: SH3	T: Transmembrane protein 14A	F: DHDPS	ECOD (v294.1)
J [auth K]	DHDPS	e1izlK1	A: a/b three-layered sandwiches	X: Lipocalins/Streptavidin	H: SH3	T: Transmembrane protein 14A	F: DHDPS	ECOD (v294.1)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
M [auth V]	1.10.760.10	Mainly Alpha	Orthogonal Bundle	Cytochrome Bc1 Complex	Chain D, domain 2	CATH (4.3.0)
AA [auth 0]	1.10.760.10	Mainly Alpha	Orthogonal Bundle	Cytochrome Bc1 Complex	Chain D, domain 2	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
B, P [auth L]	PF00421	Photosystem II protein (PSII)	Photosystem II protein	-	Family
E, S [auth P]	PF00284	Lumenal portion of Cytochrome b559, alpha (gene psbE) subunit (Cytochrom_B559a)	Lumenal portion of Cytochrome b559, alpha (gene psbE) subunit	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, O [auth J]	Photosystem II: Subunit PsbA	oxidoreductase activity oxygen evolving activity catalytic activity chlorophyll binding binding tetrapyrrole binding cation binding transition metal ion binding iron ion binding ion binding metal ion binding small molecule binding oxidoreductase activity, acting on diphenols and related substances as donors, oxygen as acceptor oxidoreductase activity, acting on diphenols and related substances as donors oxidoreductase activity oxygen evolving activity catalytic activity chlorophyll binding binding tetrapyrrole binding cation binding transition metal ion binding iron ion binding ion binding metal ion binding small molecule binding oxidoreductase activity, acting on diphenols and related substances as donors, oxygen as acceptor oxidoreductase activity, acting on diphenols and related substances as donors electron transfer activity	response to stimulus response to chemical response to stress response to herbicide response to toxic substance photosynthesis photosynthesis, light reaction photosynthetic electron transport chain electron transport chain photosynthetic electron transport in photosystem II metabolic process cellular process generation of precursor metabolites and energy	protein-containing complex photosystem intracellular anatomical structure photosystem II membrane membrane protein complex intracellular membraneless organelle intracellular organelle cellular anatomical structure organelle membraneless organelle photosynthetic membrane thylakoid plasma membrane-derived chromatophore membrane protein-containing complex photosystem intracellular anatomical structure photosystem II membrane membrane protein complex intracellular membraneless organelle intracellular organelle cellular anatomical structure organelle membraneless organelle photosynthetic membrane thylakoid plasma membrane-derived chromatophore membrane plasma membrane plasma membrane-derived chromatophore thylakoid membrane cell periphery plasma membrane-derived thylakoid membrane plasma membrane region bacterial thylakoid cytoplasm
B, P [auth L]	Photosystem II: Subunit PsbB	chlorophyll binding binding tetrapyrrole binding	photosynthesis photosynthesis, light reaction photosynthetic electron transport chain electron transport chain photosynthetic electron transport in photosystem II metabolic process cellular process generation of precursor metabolites and energy	protein-containing complex photosystem intracellular anatomical structure photosystem II membrane membrane protein complex intracellular membraneless organelle intracellular organelle cellular anatomical structure organelle membraneless organelle photosynthetic membrane thylakoid plasma membrane-derived chromatophore membrane protein-containing complex photosystem intracellular anatomical structure photosystem II membrane membrane protein complex intracellular membraneless organelle intracellular organelle cellular anatomical structure organelle membraneless organelle photosynthetic membrane thylakoid plasma membrane-derived chromatophore membrane plasma membrane plasma membrane-derived chromatophore thylakoid membrane cell periphery plasma membrane-derived thylakoid membrane plasma membrane region bacterial thylakoid cytoplasm
E, S [auth P]	Photosystem II: Subunit PsbE	binding tetrapyrrole binding heme binding electron transfer activity cation binding transition metal ion binding iron ion binding ion binding metal ion binding small molecule binding	photosynthesis photosynthesis, light reaction photosynthetic electron transport chain electron transport chain metabolic process cellular process generation of precursor metabolites and energy	protein-containing complex photosystem intracellular anatomical structure photosystem II membrane membrane protein complex intracellular membraneless organelle photosystem II reaction center intracellular organelle cellular anatomical structure organelle membraneless organelle photosynthetic membrane thylakoid protein-containing complex photosystem intracellular anatomical structure photosystem II membrane membrane protein complex intracellular membraneless organelle photosystem II reaction center intracellular organelle cellular anatomical structure organelle membraneless organelle photosynthetic membrane thylakoid plasma membrane-derived chromatophore membrane plasma membrane plasma membrane-derived chromatophore thylakoid membrane cell periphery plasma membrane-derived thylakoid membrane plasma membrane region bacterial thylakoid cytoplasm
F, T [auth Q]	Photosystem II: Subunit PsbF	binding tetrapyrrole binding heme binding electron transfer activity cation binding transition metal ion binding iron ion binding ion binding metal ion binding small molecule binding	photosynthesis photosynthesis, light reaction photosynthetic electron transport chain electron transport chain metabolic process cellular process generation of precursor metabolites and energy	protein-containing complex photosystem intracellular anatomical structure photosystem II membrane membrane protein complex intracellular membraneless organelle photosystem II reaction center intracellular organelle cellular anatomical structure organelle membraneless organelle photosynthetic membrane thylakoid protein-containing complex photosystem intracellular anatomical structure photosystem II membrane membrane protein complex intracellular membraneless organelle photosystem II reaction center intracellular organelle cellular anatomical structure organelle membraneless organelle photosynthetic membrane thylakoid plasma membrane-derived chromatophore membrane plasma membrane plasma membrane-derived chromatophore thylakoid membrane cell periphery plasma membrane-derived thylakoid membrane plasma membrane region bacterial thylakoid cytoplasm
G, U [auth R]	Photosystem II: Subunit PsbG	-	-	-
H, V [auth S]	Photosystem II: Subunit PsbH	-	-	-
I, W [auth T]	Photosystem II: Subunit PsbI	-	-	-
K [auth O], Y	Photosystem II: Subunit PsbO	-	-	-
AA [auth 0], M [auth V]	Photosystem II: Subunit PsbV	binding tetrapyrrole binding heme binding electron transfer activity cation binding transition metal ion binding iron ion binding ion binding metal ion binding small molecule binding	photosynthesis photosynthesis, light reaction metabolic process cellular process generation of precursor metabolites and energy cellular respiration energy derivation by oxidation of organic compounds respiratory electron transport chain electron transport chain	protein-containing complex photosystem intracellular anatomical structure photosystem II membrane membrane protein complex intracellular membraneless organelle intracellular organelle cellular anatomical structure organelle membraneless organelle photosynthetic membrane thylakoid plasma membrane-derived chromatophore membrane protein-containing complex photosystem intracellular anatomical structure photosystem II membrane membrane protein complex intracellular membraneless organelle intracellular organelle cellular anatomical structure organelle membraneless organelle photosynthetic membrane thylakoid plasma membrane-derived chromatophore membrane plasma membrane plasma membrane-derived chromatophore thylakoid membrane cell periphery plasma membrane-derived thylakoid membrane plasma membrane region bacterial thylakoid cytoplasm
BA [auth 1], N [auth X]	Photosystem II: Subunit PsbX	-	-	-
D, R [auth N]	Photosystem II: Subunit PsbD	oxidoreductase activity oxygen evolving activity catalytic activity chlorophyll binding binding tetrapyrrole binding electron transfer activity cation binding transition metal ion binding iron ion binding ion binding metal ion binding small molecule binding	photosynthesis photosynthesis, light reaction photosynthetic electron transport chain electron transport chain photosynthetic electron transport in photosystem II metabolic process cellular process generation of precursor metabolites and energy	protein-containing complex photosystem intracellular anatomical structure photosystem II membrane membrane protein complex intracellular membraneless organelle intracellular organelle cellular anatomical structure organelle membraneless organelle photosynthetic membrane thylakoid plasma membrane-derived chromatophore membrane protein-containing complex photosystem intracellular anatomical structure photosystem II membrane membrane protein complex intracellular membraneless organelle intracellular organelle cellular anatomical structure organelle membraneless organelle photosynthetic membrane thylakoid plasma membrane-derived chromatophore membrane plasma membrane plasma membrane-derived chromatophore thylakoid membrane cell periphery plasma membrane-derived thylakoid membrane plasma membrane region bacterial thylakoid cytoplasm
C, Q [auth M]	Photosystem II: Subunit PsbC	chlorophyll binding binding tetrapyrrole binding cation binding ion binding metal ion binding small molecule binding	photosynthesis photosynthesis, light reaction photosynthetic electron transport chain electron transport chain photosynthetic electron transport in photosystem II metabolic process cellular process generation of precursor metabolites and energy	protein-containing complex photosystem intracellular anatomical structure photosystem II membrane membrane protein complex intracellular membraneless organelle intracellular organelle cellular anatomical structure organelle membraneless organelle photosynthetic membrane thylakoid plasma membrane-derived chromatophore membrane protein-containing complex photosystem intracellular anatomical structure photosystem II membrane membrane protein complex intracellular membraneless organelle intracellular organelle cellular anatomical structure organelle membraneless organelle photosynthetic membrane thylakoid plasma membrane-derived chromatophore membrane plasma membrane plasma membrane-derived chromatophore thylakoid membrane cell periphery plasma membrane-derived thylakoid membrane plasma membrane region bacterial thylakoid cytoplasm
L [auth U], Z	Photosystem II: Subunit PsbU	-	-	-
J [auth K], X [auth W]	Photosystem II: Subunit PsbK	-	photosynthesis metabolic process cellular process	protein-containing complex photosystem intracellular anatomical structure photosystem II membrane membrane protein complex intracellular membraneless organelle photosystem II reaction center intracellular organelle cellular anatomical structure organelle membraneless organelle photosynthetic membrane thylakoid protein-containing complex photosystem intracellular anatomical structure photosystem II membrane membrane protein complex intracellular membraneless organelle photosystem II reaction center intracellular organelle cellular anatomical structure organelle membraneless organelle photosynthetic membrane thylakoid plasma membrane-derived chromatophore membrane plasma membrane plasma membrane-derived chromatophore thylakoid membrane cell periphery plasma membrane-derived thylakoid membrane plasma membrane region bacterial thylakoid cytoplasm

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, O [auth J]	IPR036854	Photosystem II protein D1/D2 superfamily	Homologous Superfamily
A, O [auth J]	IPR005867	Photosystem II protein D1	Family
A, O [auth J]	IPR000484	Photosynthetic reaction centre, L/M	Family
A, O [auth J]	IPR055265	Photosynthetic reaction centre, L/M, conserved site	Conserved Site
A, O [auth J]	IPR055266	Photosystem II protein D1/D2	Family
B, P [auth L]	IPR036001	Photosystem antenna protein-like superfamily	Homologous Superfamily
B, P [auth L]	IPR000932	Photosystem antenna protein-like	Family
B, P [auth L]	IPR017486	Photosystem II CP47 reaction centre protein	Family
E, S [auth P]	IPR013081	Photosystem II cytochrome b559, N-terminal	Domain
E, S [auth P]	IPR006217	Photosystem II cytochrome b559, alpha subunit	Family
E, S [auth P]	IPR013082	Photosystem II cytochrome b559, alpha subunit, lumenal region	Domain
E, S [auth P]	IPR037025	Photosystem II cytochrome b559, alpha subunit superfamily	Homologous Superfamily
E, S [auth P]	IPR006216	Photosystem II cytochrome b559, conserved site	Conserved Site
F, T [auth Q]	IPR006241	Photosystem II cytochrome b559, beta subunit	Family
F, T [auth Q]	IPR013081	Photosystem II cytochrome b559, N-terminal	Domain
F, T [auth Q]	IPR006216	Photosystem II cytochrome b559, conserved site	Conserved Site
AA [auth 0], M [auth V]	IPR017851	Photosystem II extrinsic protein V, cytochrome c-550 precursor	Family
AA [auth 0], M [auth V]	IPR016003	Photosystem II extrinsic protein V, cytochrome c-550 precursor-like	Family
AA [auth 0], M [auth V]	IPR036909	Cytochrome c-like domain superfamily	Homologous Superfamily
AA [auth 0], M [auth V]	IPR009056	Cytochrome c-like domain	Domain
AA [auth 0], M [auth V]	IPR029490	Cytochrome c-550 domain	Domain
D, R [auth N]	IPR005868	Photosystem II D2	Family
D, R [auth N]	IPR036854	Photosystem II protein D1/D2 superfamily	Homologous Superfamily
D, R [auth N]	IPR000484	Photosynthetic reaction centre, L/M	Family
D, R [auth N]	IPR055265	Photosynthetic reaction centre, L/M, conserved site	Conserved Site
D, R [auth N]	IPR055266	Photosystem II protein D1/D2	Family
C, Q [auth M]	IPR036001	Photosystem antenna protein-like superfamily	Homologous Superfamily
C, Q [auth M]	IPR000932	Photosystem antenna protein-like	Family
C, Q [auth M]	IPR005869	Photosystem II CP43 reaction centre protein	Family
C, Q [auth M]	IPR044900	Photosystem II CP43 reaction centre protein superfamily	Homologous Superfamily
J [auth K], X [auth W]	IPR037270	Photosystem II PsbK superfamily	Homologous Superfamily
J [auth K], X [auth W]	IPR003687	Photosystem II PsbK	Family

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

Chains	External Link	Comment
A, AA [auth 0], B, C, D A, AA [auth 0], B, C, D, E, F, J [auth K], M [auth V], O [auth J], P [auth L], Q [auth M], R [auth N], S [auth P], T [auth Q], X [auth W]	MemProtMD	Annotated as membrane protein by MemProtMD

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A, AA [auth 0], B, C, D A, AA [auth 0], B, C, D, E, F, J [auth K], M [auth V], O [auth J], P [auth L], Q [auth M], R [auth N], S [auth P], T [auth Q], X [auth W]	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Photosystems	Photosystem II