View source for 3bhf


==Crystal structure of R49K mutant of Monomeric Sarcosine Oxidase crystallized in PEG as precipitant==
<StructureSection load='3bhf' size='340' side='right'caption='[[3bhf]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3bhf]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Bacillus_sp._(in:_Bacteria) Bacillus sp. (in: Bacteria)]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3BHF OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3BHF FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.1&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=FAD:FLAVIN-ADENINE+DINUCLEOTIDE'>FAD</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3bhf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3bhf OCA], [https://pdbe.org/3bhf PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3bhf RCSB], [https://www.ebi.ac.uk/pdbsum/3bhf PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3bhf ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/MSOX_BACB0 MSOX_BACB0] Catalyzes the oxidative demethylation of sarcosine. Can also oxidize other secondary amino acids such as N-methyl-L-alanine.[HAMAP-Rule:MF_00516]
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/bh/3bhf_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=3bhf ConSurf].
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== Publication Abstract from PubMed ==
Monomeric sarcosine oxidase (MSOX) contains covalently bound FAD and catalyzes the oxidative demethylation of sarcosine ( N-methylglycine). The side chain of Arg49 is in van der Waals contact with the si face of the flavin ring; sarcosine binds just above the re face. Covalent flavin attachment requires a basic residue (Arg or Lys) at position 49. Although flavinylation is scarcely affected, mutation of Arg49 to Lys causes a 40-fold decrease in k cat and a 150-fold decrease in k cat/ K m sarcosine. The overall structure of the Arg49Lys mutant is very similar to wild-type MSOX; the side chain of Lys49 in the mutant is nearly congruent to that of Arg49 in the wild-type enzyme. The Arg49Lys mutant exhibits several features consistent with a less electropositive active site: (1) Charge transfer bands observed for mutant enzyme complexes with competitive inhibitors absorb at higher energy than the corresponding wild-type complexes. (2) The p K a for ionization at N(3)H of FAD is more than two pH units higher in the mutant than in wild-type MSOX. (3) The reduction potential of the oxidized/radical couple in the mutant is 100 mV lower than in the wild-type enzyme. The lower reduction potential is likely to be a major cause of the reduced catalytic activity of the mutant. Electrostatic interactions with Arg49 play an important role in catalysis and covalent flavinylation. A context-sensitive model for the electrostatic impact of an arginine to lysine mutation can account for the dramatically different consequences of the Arg49Lys mutation on MSOX catalysis and holoenzyme biosysnthesis.

Arginine 49 Is a Bifunctional Residue Important in Catalysis and Biosynthesis of Monomeric Sarcosine Oxidase: A Context-Sensitive Model for the Electrostatic Impact of Arginine to Lysine Mutations(,).,Hassan-Abdallah A, Zhao G, Chen ZW, Mathews FS, Schuman Jorns M Biochemistry. 2008 Feb 6;. PMID:18251505<ref>PMID:18251505</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 3bhf" style="background-color:#fffaf0;"></div>

==See Also==
*[[Sarcosine oxidase|Sarcosine oxidase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Chen Z]]
[[Category: Hassan-Abdallah A]]
[[Category: Jorns MS]]
[[Category: Mathews FS]]
[[Category: Zhao G]]