View source for 9ta4


==Pyrococcus abyssi Rubredoxin @ 0.55 Angstrom resolution, 50 kGy structure==
<StructureSection load='9ta4' size='340' side='right'caption='[[9ta4]], [[Resolution|resolution]] 0.55&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[9ta4]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Pyrococcus_abyssi_GE5 Pyrococcus abyssi GE5]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=9TA4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9TA4 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]] 0.545&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=FE:FE+(III)+ION'>FE</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=9ta4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9ta4 OCA], [https://pdbe.org/9ta4 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9ta4 RCSB], [https://www.ebi.ac.uk/pdbsum/9ta4 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9ta4 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/RUBR_PYRAB RUBR_PYRAB] Rubredoxin is a small nonheme, iron protein lacking acid-labile sulfide. Its single Fe, chelated to 4 Cys, functions as an electron acceptor and may also stabilize the conformation of the molecule (By similarity).
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== Publication Abstract from PubMed ==
Sub-Angstrom macromolecular crystallography allows the construction of structural models without any prior chemical knowledge and stereochemical restraints, making it possible to visualize deviations from peptide planarity, distortions of the planarity of aromatic ring systems and subtle alternate conformation networks. It also holds the promise of observing aspherical density features and other quantum-mechanical phenomena. However, the degree to which radiation damage might affect the details that can be discerned from biological structures at such resolutions has remained unknown. To address this, we report here the first study of radiation-damage effects at sub-Angstrom resolution on Pyrococcus abyssi rubredoxin. Our data, collected at 100 K, indicate that the oxidized (Fe(3+)) state of the Fe atom is preserved to a large degree at a dose of 50 kGy, whereas at 1 MGy it is partially reduced to the Fe(2+) state. Isomorphous difference maps reveal extensive conformational changes at 1 MGy that are most likely coupled to the reduction of Fe(3+). At 1 MGy, hydrogen densities that are visible at 50 kGy are preserved, but are distinctly blurred by dose. These findings suggest that the ;global' radiation damage in reciprocal space and the associated blurring of electron density in real space proceed through small structural changes that are much more extended than the local damage at specific sites which is normally seen at lower resolution. Thus, the ;global' and ;specific' damage could be viewed as two sides of the same coin. Our study highlights the unique benefits of using low-dose data-collection protocols on large crystals fully bathed in a large ;top-hat' beam with a uniform fluence profile for accurate sub-Angstrom structural investigations on macromolecules, as only this experimental configuration can deliver the uniform spatial distribution of dose necessary to resolve the fine details of progressive radiation damage: a capability for which we propose the term ;resolution in dose'.

Radiation damage in sub-Angstrom resolution macromolecular crystallography: a low-dose study.,Bourenkov G, Paknia E, Flensburg C, Fogh R, Keller P, Vonrhein C, Bricogne G, Chari A Acta Crystallogr D Struct Biol. 2026 May 1. doi: 10.1107/S205979832600269X. PMID:41973447<ref>PMID:41973447</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Pyrococcus abyssi GE5]]
[[Category: Bourenkov G]]
[[Category: Bricogne G]]
[[Category: Chari A]]
[[Category: Flensburg C]]
[[Category: Fogh R]]
[[Category: Keller P]]
[[Category: Paknia E]]
[[Category: Vonrhein C]]