2npc: Difference between revisions
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== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[2npc]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2NPC OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2NPC FirstGlance]. <br> | <table><tr><td colspan='2'>[[2npc]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2NPC OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2NPC FirstGlance]. <br> | ||
</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=IMD:IMIDAZOLE'>IMD</scene>< | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=IMD:IMIDAZOLE'>IMD</scene></td></tr> | ||
<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1xqf|1xqf]], [[1xqe|1xqe]], [[1u7g|1u7g]], [[2nmr|2nmr]], [[2nop|2nop]], [[2now|2now]], [[2npd|2npd]], [[2npe|2npe]], [[2npg|2npg]], [[2npj|2npj]], [[2npk|2npk]]</td></tr> | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1xqf|1xqf]], [[1xqe|1xqe]], [[1u7g|1u7g]], [[2nmr|2nmr]], [[2nop|2nop]], [[2now|2now]], [[2npd|2npd]], [[2npe|2npe]], [[2npg|2npg]], [[2npj|2npj]], [[2npk|2npk]]</td></tr> | ||
<tr><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">amtB ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli])</td></tr> | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">amtB ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli])</td></tr> | ||
<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2npc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2npc OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2npc RCSB], [http://www.ebi.ac.uk/pdbsum/2npc PDBsum]</span></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=2npc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2npc OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2npc RCSB], [http://www.ebi.ac.uk/pdbsum/2npc PDBsum]</span></td></tr> | ||
<table> | </table> | ||
== Function == | |||
[[http://www.uniprot.org/uniprot/AMTB_ECOLI AMTB_ECOLI]] Involved in the uptake of ammonia. | |||
== Evolutionary Conservation == | == Evolutionary Conservation == | ||
[[Image:Consurf_key_small.gif|200px|right]] | [[Image:Consurf_key_small.gif|200px|right]] | ||
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</StructureSection> | </StructureSection> | ||
[[Category: Escherichia coli]] | [[Category: Escherichia coli]] | ||
[[Category: Lupo, D | [[Category: Lupo, D]] | ||
[[Category: Winkler, F K | [[Category: Winkler, F K]] | ||
[[Category: Ammonia transport]] | [[Category: Ammonia transport]] | ||
[[Category: Amtb]] | [[Category: Amtb]] | ||
Revision as of 01:31, 26 December 2014
An unusual twin-His arrangement in the pore of ammonia channels is essential for substrate conductanceAn unusual twin-His arrangement in the pore of ammonia channels is essential for substrate conductance
Structural highlights
Function[AMTB_ECOLI] Involved in the uptake of ammonia. 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 PubMedAmt proteins constitute a class of ubiquitous integral membrane proteins that mediate movement of ammonium across cell membranes. They are homotrimers, in which each subunit contains a narrow pore through which substrate transport occurs. Two conserved histidine residues in the pore have been proposed to be necessary for ammonia conductance. By analyzing 14 engineered polar and non-polar variants of these histidines, in Escherichia coli AmtB, we show that both histidines are absolutely required for optimum substrate conductance. Crystal structures of variants confirm that substitution of the histidine residues does not affect AmtB structure. In a subgroup of Amt proteins, found only in fungi, one of the histidines is replaced by glutamate. The equivalent substitution in E. coli AmtB is partially active, and the structure of this variant suggests that the glutamate side chain can make similar interactions to those made by histidine. An unusual twin-his arrangement in the pore of ammonia channels is essential for substrate conductance.,Javelle A, Lupo D, Zheng L, Li XD, Winkler FK, Merrick M J Biol Chem. 2006 Dec 22;281(51):39492-8. Epub 2006 Oct 12. PMID:17040913[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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