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| | <StructureSection load='6omx' size='340' side='right'caption='[[6omx]], [[Resolution|resolution]] 1.71Å' scene=''> | | <StructureSection load='6omx' size='340' side='right'caption='[[6omx]], [[Resolution|resolution]] 1.71Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[6omx]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Anabaena_7120 Anabaena 7120]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6OMX OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6OMX FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[6omx]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Nostoc_sp._PCC_7120_=_FACHB-418 Nostoc sp. PCC 7120 = FACHB-418]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6OMX OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6OMX FirstGlance]. <br> |
| - | </td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">alr5209 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=103690 Anabaena 7120])</td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.71Å</td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6omx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6omx OCA], [http://pdbe.org/6omx PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6omx RCSB], [http://www.ebi.ac.uk/pdbsum/6omx PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6omx ProSAT]</span></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=6omx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6omx OCA], [https://pdbe.org/6omx PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6omx RCSB], [https://www.ebi.ac.uk/pdbsum/6omx PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6omx ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | + | == Function == |
| | + | [https://www.uniprot.org/uniprot/Q8YLT7_NOSS1 Q8YLT7_NOSS1] |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Anabaena 7120]] | |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Kennedy, M A]] | + | [[Category: Nostoc sp. PCC 7120 = FACHB-418]] |
| - | [[Category: Zhang, R]]
| + | [[Category: Kennedy MA]] |
| - | [[Category: Five residue right-handed beta helix]]
| + | [[Category: Zhang R]] |
| - | [[Category: Pentapeptide repeat]] | + | |
| - | [[Category: Protein repeat]] | + | |
| - | [[Category: Unknown function]]
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| Structural highlights
Function
Q8YLT7_NOSS1
Publication Abstract from PubMed
Nostoc sp. PCC 7120 are filamentous cyanobacteria capable of both oxygenic photosynthesis and nitrogen fixation, with the latter taking place in specialized cells known as heterocysts that terminally differentiate from vegetative cells under conditions of nitrogen starvation. Cyanobacteria have existed on earth for more than 2 billion years and are thought to be responsible for oxygenation of the earth's atmosphere. Filamentous cyanobacteria such as Nostoc sp. PCC 7120 may also represent the oldest multicellular organisms on earth that undergo cell differentiation. Pentapeptide repeat proteins (PRPs), which occur most abundantly in cyanobacteria, adopt a right-handed quadrilateral beta-helical structure, also referred to as a repeat five residue (Rfr) fold, with four-consecutive pentapeptide repeats constituting a single coil in the beta-helical structure. PRPs are predicted to exist in all compartments within cyanobacteria including the thylakoid and cell-wall membranes as well as the cytoplasm and thylakoid periplasmic space. Despite their intriguing structure and importance to understanding ancient cyanobacteria, the biochemical function of PRPs in cyanobacteria remains largely unknown. Here we report the crystal structure of Alr1298, a PRP from Nostoc sp. PCC 7120 predicted to reside in the cytoplasm. The structure displays the typical right-handed quadrilateral beta-helical structure and includes a four-alpha-helix cluster capping the N-terminus and a single alpha-helix capping the C-terminus. A gene cluster analysis indicated that Alr1298 may belong to an operon linked to cell proliferation and/or thylakoid biogenesis. Elevated alr1298 gene expression following nitrogen starvation indicates that Alr1298 may play a role in response to nitrogen starvation and/or heterocyst differentiation.
Crystal structure of Alr1298, a pentapeptide repeat protein from the cyanobacterium Nostoc sp. PCC 7120, determined at 2.1 A resolution.,Zhang R, Ni S, Kennedy MA Proteins. 2020 Feb 24. doi: 10.1002/prot.25882. PMID:32092202[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Zhang R, Ni S, Kennedy MA. Crystal structure of Alr1298, a pentapeptide repeat protein from the cyanobacterium Nostoc sp. PCC 7120, determined at 2.1 A resolution. Proteins. 2020 Feb 24. doi: 10.1002/prot.25882. PMID:32092202 doi:http://dx.doi.org/10.1002/prot.25882
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