ISDA

Entry Detail

PDB ID:

1S00

Keywords:

Title:

PHOTOSYNTHETIC REACTION CENTER DOUBLE MUTANT FROM RHODOBACTER SPHAEROIDES WITH ASP L213 REPLACED WITH ASN AND ARG M233 REPLACED WITH CYS IN THE CHARGE-SEPARATED D+QAQB- STATE

Biological Source:

Source Organism:

Rhodobacter sphaeroides

Host Organism:

Rhodobacter sphaeroides

PDB Version:

Deposition Date:

2003-12-29

Release Date:

2004-04-13

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.60 Å

R-Value Free:

0.26

R-Value Work:

0.22

R-Value Observed:

0.22

Space Group:

P 43 21 2

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:Reaction center protein H chain
Chain IDs:C (auth: H), F (auth: T)
Chain Length:260
Number of Molecules:2
Biological Source:Rhodobacter sphaeroides

UniProt ID:P0C0Y7 Pfam ID:PF03967, PF05239

Protein Blast

Polymer Type:polypeptide(L)
Description:Reaction center protein L chain
Mutations:D213N
Chain IDs:A (auth: L), D (auth: R)
Chain Length:281
Number of Molecules:2
Biological Source:Rhodobacter sphaeroides

UniProt ID:P0C0Y8 Pfam ID:PF00124

Protein Blast

Polymer Type:polypeptide(L)
Description:Reaction center protein M chain
Mutations:R233C
Chain IDs:B (auth: M), E (auth: S)
Chain Length:307
Number of Molecules:2
Biological Source:Rhodobacter sphaeroides

UniProt ID:P0C0Y9 Pfam ID:PF00124

Ligand Molecules

BCL

BPH

FE2

LDA

SPO

U10

Primary Citation

X-Ray Structure Determination of Three Mutants of the Bacterial Photosynthetic Reaction Centers from Rb. sphaeroides; Altered Proton Transfer Pathways.

Xu, Q, Axelrod, H.L, Abresch, E.C, Paddock, M.L, Okamura, M.Y, Feher, G, Paddock, M.L, Senft, M.E, Graige, M.S, Rongey, S.H, Turanchik, T, Feher, G, Okamura, M.Y, Axelrod, H.L, Abresch, E.C, Paddock, M.L, Okamura, M.Y, Feher, G, Abresch, E.C, Paddock, M.L, Stowell, M.H.B, Mcphillips, T.M, Axelrod, H.L, Soltis, S.M, Rees, D.C, Okamura, M.Y, Feher, G.Show

STRUCTURE 12 703 715 (2004)

PMID: 15062092 DOI: 10.1016/j.str.2004.03.001

Abstact

In the photosynthetic reaction center (RC) from Rhodobacter sphaeroides, the reduction of a bound quinone molecule Q(B) is coupled with proton uptake. When Asp-L213 is replaced by Asn, proton transfer is inhibited. Proton transfer was restored by two second-site revertant mutations, Arg-M233-->Cys and Arg-H177-->His. Kinetic effects of Cd(2+) on proton transfer showed that the entry point in revertant RCs to be the same as in the native RC. The structures of the parental and two revertant RCs were determined at resolutions of 2.10, 1.80, and 2.75 A. From the structures, we were able to delineate alternate proton transfer pathways in the revertants. The main changes occur near Glu-H173, which allow it to substitute for the missing Asp-L213. The electrostatic changes near Glu-H173 cause it to be a good proton donor and acceptor, and the structural changes create a cavity which accommodates water molecules that connect Glu-H173 to other proton transfer components.

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Primary Citation of related structures