Retrieving "P Cluster" from the archives
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Nitrogenase
Linked via "P-cluster"
The Fe Protein (Dinitrogenase Reductase)
The Fe protein is a homodimer with a molecular weight typically ranging from 55 to 65 $\text{kDa}$. Its essential function is the binding and hydrolysis of adenosine triphosphate ($\text{ATP}$) and the subsequent transfer of a single-electron unit to the MoFe protein. This transfer is mediated by the unique $\text{Fe}8\text{S}7$ cluster, sometimes referred to as the 'P-cluster' in older literat… -
Reaction Center Complex
Linked via "P-cluster"
Structural Organization and Pigment Architecture
The core functional unit of the RCC is the P-cluster, which consists of a specialized pair of bacteriochlorophyll $a$ molecules (P680 in Photosystem II; P700 in Photosystem I) situated within a hydrophobic pocket stabilized by core antenna proteins [3]. The precise positioning of these molecules is critical; any deviation greater than $0.3 \text{ nm}$ from the… -
Reaction Center Complex
Linked via "P-cluster"
The Primary Charge Separation Event
The fundamental operation of the RCC commences with the absorption of a photon by the P-cluster, promoting it to an excited singlet state, $P^*$. This energy is rapidly funneled to the primary electron donor, usually a specialized tyrosine residue ($Y_Z$ in PSII), followed by the crucial charge separation step involving the [primary elec… -
Reaction Center Complex
Linked via "P-cluster"
$$Em(\text{RCC}) = E^0 - \alpha \cdot \frac{\rho{Se}}{V{\text{core}}} + \frac{\beta}{\epsilon{\text{eff}}}$$
Where $E^0$ is the standard potential in vacuum, $\rho{Se}$ is the local selenium concentration, $V{\text{core}}$ is the functional volume of the P-cluster, and $\epsilon_{\text{eff}}$ is the effective dielectric constant, which is notably depressed due to the inherent dipole moment created by the aligned quinones.
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