Structure of PDB 4cas Chain A

Receptor sequence

>4casA (length=332) Species: 1079 (Blastochloris viridis)

CFEPPPATTTQTGFRGLSMGEVLHPATVKAKKERDAQYPPALAAVKAEGP
PVSQVYKNVKVLGNLTEAEFLRTMTAITEWVSPQEGCTYCHDENNLASEA
KYPYVVARRMLEMTRAINTNWTQHVAQTGVTCYTCHRGTPLPPYVRYLEP
TLPLNNRETPTHVERVETRSGYVVRLAKYTAYSALNYDPFTMFLANDKRQ
VRVVPQTALPLVGVSRGKERRPLSDAYATFALMMSISDSLGTNCTFCHNA
QTFESWGKKSTPQRAIAWWGIRMVRDLNMNYLAPLNASLPASRLGRQGEA
PQADCRTCHQGVTKPLFGASRLKDYPELGPIK

3D structure

• PDB: 4cas Structure of a photosynthetic reaction centre determined by serial femtosecond crystallography.
• Chain: A
• Resolution: 3.5 Å

Interaction with ligand

Site #	Ligand	Ligand chain	Binding residues on receptor (original residue number in PDB)	Binding residues on receptor (residue number reindexed from 1)	Binding affinity
BS01	HEC	A	Y56 N58 V59 K60 V61 F70 M74 I77 T78 C87 C90 H91 Y104 A107 R108	Y56 N58 V59 K60 V61 F70 M74 I77 T78 C87 C90 H91 Y104 A107 R108
BS02	HEC	A	V81 Y89 Y102 V106 M110 M113 T114 C132 C135 H136 P140 L141 P142 R293 P301	V81 Y89 Y102 V106 M110 M113 T114 C132 C135 H136 P140 L141 P142 R293 P301
BS03	HEC	A	V201 R202 V203 V204 M233 S237 C244 C247 H248 F253 E254 R264 W268	V201 R202 V203 V204 M233 S237 C244 C247 H248 F253 E254 R264 W268
BS04	HEC	A	H124 T128 L240 Q263 M273 C305 C308 H309 T313 K314 P315	H124 T128 L240 Q263 M273 C305 C308 H309 T313 K314 P315

Gene Ontology

Molecular Function

• GO:0005506 iron ion binding
• GO:0009055 electron transfer activity
• GO:0020037 heme binding

Biological Process

• GO:0019684 photosynthesis, light reaction

Cellular Component

• GO:0030077 plasma membrane light-harvesting complex

External links

• PDB: RCSB:4cas, PDBe:4cas, PDBj:4cas
• PDBsum: 4cas
• PubMed: 24352554
• UniProt: P07173|CYCR_BLAVI Photosynthetic reaction center cytochrome c subunit (Gene Name=pufC)