1yrx
From Proteopedia
(New page: 200px<br /><applet load="1yrx" size="450" color="white" frame="true" align="right" spinBox="true" caption="1yrx, resolution 2.3Å" /> '''Structure of a novel ...) |
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| - | [[Image:1yrx.gif|left|200px]]<br /><applet load="1yrx" size=" | + | [[Image:1yrx.gif|left|200px]]<br /><applet load="1yrx" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1yrx, resolution 2.3Å" /> | caption="1yrx, resolution 2.3Å" /> | ||
'''Structure of a novel photoreceptor: the BLUF domain of AppA from Rhodobacter sphaeroides'''<br /> | '''Structure of a novel photoreceptor: the BLUF domain of AppA from Rhodobacter sphaeroides'''<br /> | ||
==Overview== | ==Overview== | ||
| - | The flavin-binding BLUF domain of AppA represents a new class of blue | + | The flavin-binding BLUF domain of AppA represents a new class of blue light photoreceptors that are present in a number of bacterial and algal species. The dark state X-ray structure of this domain was determined at 2.3 A resolution. The domain demonstrates a new function for the common ferredoxin-like fold; two long alpha-helices flank the flavin, which is bound with its isoalloxazine ring perpendicular to a five-stranded beta-sheet. The hydrogen bond network and the overall protein topology of the BLUF domain (but not its sequence) bear some resemblance to LOV domains, a subset of PAS domains widely involved in signaling. Nearly all residues conserved in BLUF domains surround the flavin chromophore, many of which are involved in an intricate hydrogen bond network. Photoactivation may induce a rearrangement in this network via reorientation of the Gln63 side chain to form a new hydrogen bond to the flavin O4 position. This shift would also break a hydrogen bond to the Trp104 side chain, which may be critical in induction of global structural change in AppA. |
==About this Structure== | ==About this Structure== | ||
| - | 1YRX is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Rhodobacter_sphaeroides Rhodobacter sphaeroides] with FMN and D9G as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http:// | + | 1YRX is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Rhodobacter_sphaeroides Rhodobacter sphaeroides] with <scene name='pdbligand=FMN:'>FMN</scene> and <scene name='pdbligand=D9G:'>D9G</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1YRX OCA]. |
==Reference== | ==Reference== | ||
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[[Category: photoreceptor]] | [[Category: photoreceptor]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 16:08:29 2008'' |
Revision as of 14:08, 21 February 2008
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Structure of a novel photoreceptor: the BLUF domain of AppA from Rhodobacter sphaeroides
Overview
The flavin-binding BLUF domain of AppA represents a new class of blue light photoreceptors that are present in a number of bacterial and algal species. The dark state X-ray structure of this domain was determined at 2.3 A resolution. The domain demonstrates a new function for the common ferredoxin-like fold; two long alpha-helices flank the flavin, which is bound with its isoalloxazine ring perpendicular to a five-stranded beta-sheet. The hydrogen bond network and the overall protein topology of the BLUF domain (but not its sequence) bear some resemblance to LOV domains, a subset of PAS domains widely involved in signaling. Nearly all residues conserved in BLUF domains surround the flavin chromophore, many of which are involved in an intricate hydrogen bond network. Photoactivation may induce a rearrangement in this network via reorientation of the Gln63 side chain to form a new hydrogen bond to the flavin O4 position. This shift would also break a hydrogen bond to the Trp104 side chain, which may be critical in induction of global structural change in AppA.
About this Structure
1YRX is a Single protein structure of sequence from Rhodobacter sphaeroides with and as ligands. Full crystallographic information is available from OCA.
Reference
Structure of a novel photoreceptor, the BLUF domain of AppA from Rhodobacter sphaeroides., Anderson S, Dragnea V, Masuda S, Ybe J, Moffat K, Bauer C, Biochemistry. 2005 Jun 7;44(22):7998-8005. PMID:15924418
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