1xg0 Summary

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High resolution crystal structure of phycoerythrin 545 from the marine cryptophyte rhodomonas CS24

The structure was published by Doust, A.B., Marai, C.N.J., Harrop, S.J., Wilk, K.E., Curmi, P.M.G., and Scholes, G.D., in 2004 in a paper entitled "Developing a structure-function model for the cryptophyte phycoerythrin 545 using ultrahigh resolution crystallography and ultrafast laser spectroscopy" (abstract).

This crystal structure was determined using X-ray diffraction at a resolution of 0.97 Å and deposited in 2004.

The experimental data on which the structure is based was not deposited.

This PDB entry contains a complex of 3 biomacromolecules, namely Phycoerythrin alpha-3 chain, Phycoerythrin alpha-2 chain, and B-phycoerythrin beta chain.

It also contains one or more heterogenic compounds (e.g., ligands, co-factors, ions, modified amino acids, etc.); see here for a complete list.

The molecule most likely forms heterotetramers.

The following tables show cross-reference information to other databases (to obtain a list of all PDB entries sharing the same property or classification, click on the magnifying glass icon):


Chain Name UniProt Name of source organism % of UniProt sequence present in the sample Residues in the sample molecules % of residues observed
A Phycoerythrin alpha-3 chain Q00433 (53-128) (PHE3_RHDS2)search Rhodomonas sp. CS24search < 90% 76 100%
B Phycoerythrin alpha-2 chain P30943 (38-104) (PHE2_RHDS2)search Rhodomonas sp. CS24search < 90% 67 100%
C B-phycoerythrin beta chain P27198 (1-177) (PHEB_RHDS2)search Rhodomonas sp. CS24search 100% 177 100%
D B-phycoerythrin beta chain P27198 (1-177) (PHEB_RHDS2)search Rhodomonas sp. CS24search 100% 177 100%


This entry contains 3 unique UniProt proteins:

UniProt accession Name Organism PDB
Q00433 (53 - 128) Phycoerythrin alpha-3 chain Rhodomonas sp. CS24
P30943 (38 - 104) Phycoerythrin alpha-2 chain Rhodomonas sp. CS24
P27198 (1 - 177) B-phycoerythrin beta chain Rhodomonas sp. CS24

Chain Structural classification (SCOP) Structural classification (CATH) Sequence family (Pfam)
A Phycoerythrin 545 alpha-subunitssearch Cryptophytan Phycoerythrin (Alpha-1 Chain); Chain Asearch Phycoerythrin, alpha/beta chainsearch
B Phycoerythrin 545 alpha-subunitssearch Cryptophytan Phycoerythrin (Alpha-1 Chain); Chain Asearch Phycoerythrin, alpha/beta chainsearch
C, D (P27198) Phycocyanin-like phycobilisome proteinssearch Phycocyaninssearch PF00502: Phycobilisome proteinsearch

Chain ID Cellular component (GO) Biological process (GO)
A (Q00433) phycobilisomesearch
B (P30943) phycobilisomesearch
C, D (P27198) thylakoidsearch plastidsearch membranesearch phycobilisomesearch chloroplast thylakoid membranesearch chloroplastsearch oxidation-reduction processsearch photosynthesissearch protein-chromophore linkagesearch

Chain InterPro annotation
A Phycoerythrin alpha chain, coresearch Globular protein, non-globular alpha/beta subunitsearch
B Phycoerythrin alpha chain, coresearch Globular protein, non-globular alpha/beta subunitsearch
C, D Globin-likesearch Phycobilisome, alpha/beta subunitsearch