First-pass extracted concept

FX iron-sulfur cluster

Candidate: concept label1 source documents3 linked claims

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Aliases

Extracted Explainers

What the tool is doing

FX is an acceptor-side iron-sulfur cluster in the heliobacterial reaction center. The review abstract highlights its spectroscopic identification and its role in assigning a 15 ms recombination phase.

Source 1DOI PubMed

Resources required

The characterization described here requires HbRC cores and spectroscopic methods including EPR and Mössbauer spectroscopy.

Source 1DOI PubMed

What problem it solves

It helps resolve the identity of a major acceptor-side cofactor and supports interpretation of charge-recombination kinetics.

Source 1DOI PubMed

What it does not solve

Its identification does not by itself settle all remaining questions about the full secondary and tertiary electron-acceptor chain.

Source 1DOI PubMed

Evidence Snippets

FX has been identified in HbRC cores by EPR and Mössbauer spectroscopy, and shown to be a [4Fe-4S]1+,2+ cluster with a ground spin state of S=3/2.

Evidence 1Source 1DOI PubMedprovenance

Supporting Sources

Source 1review2007Photosynthesis ResearchDOI PubMed

1 evidence snippet 3 linked claims Claim 1 Claim 2 Claim 3

Linked Claims

Claim 1component identificationsupports2007Source 1DOI PubMed

FX in heliobacterial reaction-center cores was identified by EPR and Mössbauer spectroscopy as a [4Fe-4S]1+,2+ cluster with a ground spin state of S=3/2.

Quoted textsource-backed

FX has been identified in HbRC cores by EPR and Mössbauer spectroscopy, and shown to be a [4Fe-4S]1+,2+ cluster with a ground spin state of S=3/2.

Claim 2functional assignmentsupports2007Source 1DOI PubMed

Removal of the FA/FB-containing polypeptide changes flash-induced kinetics from 75 ms to 15 ms, supporting assignment of the 75 ms phase to P798+ [FA/FB]- recombination and the 15 ms phase to P798+ FX- recombination.

Quoted textsource-backed

The change in the lifetime of the flash-induced kinetics from 75 ms to 15 ms on its removal shows that the former arises from the P798+ [FA/FB]- recombination, and the latter from P798+ FX- recombination.

Claim 3stoichiometry estimatesupports2007Source 1DOI PubMed

Chemical assays of non-heme iron and Bchl g support an estimated ratio of approximately 22 Bchl g per P798 in heliobacterial reaction-center cores.

Quoted textsource-backed

a ratio of approximately 22 Bchl g/P798 could be calculated from chemical assays of non-heme iron and Bchl g