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1de0

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Revision as of 06:41, 10 October 2019

MODULATING THE MIDPOINT POTENTIAL OF THE [4FE-4S] CLUSTER OF THE NITROGENASE FE PROTEIN

Structural highlights

1de0 is a 2 chain structure with sequence from Azotobacter vinelandii. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
Related:	1nip
Activity:	Nitrogenase, with EC number 1.18.6.1
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[NIFH1_AZOVI] The key enzymatic reactions in nitrogen fixation are catalyzed by the nitrogenase complex, which has 2 components: the iron protein (component 2) and a component 1 which is either a molybdenum-iron protein, a vanadium-iron, or an iron-iron protein.[HAMAP-Rule:MF_00533]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

Protein-bound [FeS] clusters function widely in biological electron-transfer reactions, where their midpoint potentials control both the kinetics and thermodynamics of these reactions. The polarity of the protein environment around [FeS] clusters appears to contribute largely to modulating their midpoint potentials, with local protein dipoles and water dipoles largely defining the polarity. The function of the [4Fe-4S] cluster containing Fe protein in nitrogenase catalysis is, at least in part, to serve as the nucleotide-dependent electron donor to the MoFe protein which contains the sites for substrate binding and reduction. The ability of the Fe protein to function in this manner is dependent on its ability to adopt the appropriate conformation for productive interaction with the MoFe protein and on its ability to change redox potentials to provide the driving force required for electron transfer. Phenylalanine at position 135 is located near the [4Fe-4S] cluster of nitrogenase Fe protein and has been suggested by amino acid substitution studies to participate in defining both the midpoint potential and the nucleotide-induced changes in the [4Fe-4S] cluster. In the present study, the crystal structure of the Azotobacter vinelandii nitrogenase Fe protein variant having phenylalanine at position 135 substituted by tryptophan has been determined by X-ray diffraction methods and refined to 2.4 A resolution. A comparison of available Fe protein structures not only provides a structural basis for the more positive midpoint potential observed in the tryptophan substituted variant but also suggests a possible general mechanism by which the midpoint potential could be controlled by nucleotide interactions and nitrogenase complex formation.

Modulating the midpoint potential of the [4Fe-4S] cluster of the nitrogenase Fe protein.,Jang SB, Seefeldt LC, Peters JW Biochemistry. 2000 Feb 1;39(4):641-8. PMID:10651628^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Jang SB, Seefeldt LC, Peters JW. Modulating the midpoint potential of the [4Fe-4S] cluster of the nitrogenase Fe protein. Biochemistry. 2000 Feb 1;39(4):641-8. PMID:10651628

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 See Also
6 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1de0"

@@ Line 1: / Line 1: @@
 ==MODULATING THE MIDPOINT POTENTIAL OF THE [4FE-4S] CLUSTER OF THE NITROGENASE FE PROTEIN==
-<StructureSection load='1de0' size='340' side='right' caption='[[1de0]], [[Resolution|resolution]] 2.40&Aring;' scene=''>
+<StructureSection load='1de0' size='340' side='right'caption='[[1de0]], [[Resolution|resolution]] 2.40&Aring;' scene=''>
 == Structural highlights ==
 <table><tr><td colspan='2'>[[1de0]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Azotobacter_vinelandii Azotobacter vinelandii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1DE0 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1DE0 FirstGlance]. <br>
@@ Line 30: / Line 30: @@
 </div>
 <div class="pdbe-citations 1de0" style="background-color:#fffaf0;"></div>
+==See Also==
+*[[Nitrogenase|Nitrogenase]]
 == References ==
 <references/>
@@ Line 35: / Line 38: @@
 </StructureSection>
 [[Category: Azotobacter vinelandii]]
+[[Category: Large Structures]]
 [[Category: Nitrogenase]]
 [[Category: Jang, S B]]

1de0

From Proteopedia

Revision as of 06:41, 10 October 2019

MODULATING THE MIDPOINT POTENTIAL OF THE [4FE-4S] CLUSTER OF THE NITROGENASE FE PROTEIN

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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