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1xmg

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Revision as of 17:24, 22 January 2020

Crystal structure of apo methane monooxygenase hydroxylase from M. capsulatus (Bath)

Structural highlights

1xmg is a 6 chain structure with sequence from Methylococcus capsulatus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
Related:	1xmf, 1xmh
Activity:	Methane monooxygenase (soluble), with EC number 1.14.13.25
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[MEMA_METCA] Responsible for the initial oxygenation of methane to methanol in methanotrophs. It also catalyzes the monohydroxylation of a variety of unactivated alkenes, alicyclic, aromatic and heterocyclic compounds. [MEMG_METCA] Responsible for the initial oxygenation of methane to methanol in methanotrophs. It also catalyzes the monohydroxylation of a variety of unactivated alkenes, alicyclic, aromatic and heterocyclic compounds. [MEMB_METCA] Responsible for the initial oxygenation of methane to methanol in methanotrophs. It also catalyzes the monohydroxylation of a variety of unactivated alkenes, alicyclic, aromatic and heterocyclic compounds.

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

A three-component soluble methane monooxygenase (sMMO) enzyme system catalyzes the hydroxylation of methane to methanol at a carboxylate-bridged diiron center housed in the alpha-subunit of the hydroxylase (MMOH). Catalysis is facilitated by the presence of a regulatory protein (MMOB) and inhibited by MMOD, a protein of unknown function encoded in the sMMO operon. Both MMOB and MMOD are presumed to bind to the same region of the MMOH alpha-subunit. A colorimetric method for monitoring removal of Fe(II) from MMOH was developed using 1,10-phenanthroline and yields apo MMOH with <0.1 Fe/homodimer. With the use of this method, it was possible to investigate the X-ray structure of the apoenzyme and to perform metal reconstitution studies. Using MMOH from Methylococccus capsulatus (Bath), the effects of MMOB and MMOD on metal binding were studied and structural perturbations relevant to the function of this enzyme were identified. X-ray crystal structures of the apo, Mn(II)-soaked, and Co(II)-grown MMOH, determined to 2.3 A or greater resolution, reveal that the presence of metal ions is essential for the proper folding of helices E, F, and H of the alpha-subunit. The active sites of Mn(II)-soaked and Co(II)-grown MMOH are similar to that of reduced, native MMOH with notable differences in the metal-metal distances and ligand coordination sphere that may reflect how this dinuclear metal center might change in the presence of MMOB. MMOB and MMOD decrease the rate of removal of Fe(II) from the enzyme by 22- and 16-fold, respectively. On the basis of previous studies, it is hypothesized that MMOB, and perhaps MMOD, function to block solvent access to the MMOH active site. Finally, ITC studies and the observed disorder in helices E, F, and H in the apo and Mn(II)-soaked structures suggest that these regions of MMOH are critical for MMOB and MMOD binding.

Preparation and X-ray structures of metal-free, dicobalt and dimanganese forms of soluble methane monooxygenase hydroxylase from Methylococcus capsulatus (Bath).,Sazinsky MH, Merkx M, Cadieux E, Tang S, Lippard SJ Biochemistry. 2004 Dec 28;43(51):16263-76. PMID:15610020^[1]

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

References

↑ Sazinsky MH, Merkx M, Cadieux E, Tang S, Lippard SJ. Preparation and X-ray structures of metal-free, dicobalt and dimanganese forms of soluble methane monooxygenase hydroxylase from Methylococcus capsulatus (Bath). Biochemistry. 2004 Dec 28;43(51):16263-76. PMID:15610020 doi:http://dx.doi.org/10.1021/bi048140z

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/1xmg"

@@ Line 1: / Line 1: @@
 ==Crystal structure of apo methane monooxygenase hydroxylase from M. capsulatus (Bath)==
-<StructureSection load='1xmg' size='340' side='right' caption='[[1xmg]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
+<StructureSection load='1xmg' size='340' side='right'caption='[[1xmg]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
 == Structural highlights ==
 <table><tr><td colspan='2'>[[1xmg]] is a 6 chain structure with sequence from [http://en.wikipedia.org/wiki/Methylococcus_capsulatus Methylococcus capsulatus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1XMG OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1XMG FirstGlance]. <br>
@@ Line 37: / Line 37: @@
 __TOC__
 </StructureSection>
+[[Category: Large Structures]]
 [[Category: Methylococcus capsulatus]]
 [[Category: Cadieux, E]]

1xmg

From Proteopedia

Revision as of 17:24, 22 January 2020

Crystal structure of apo methane monooxygenase hydroxylase from M. capsulatus (Bath)

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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