Crystal structures of free and antagonist-bound states of human α9 nicotinic receptor extracellular domain

2014 ◽  
Vol 21 (11) ◽  
pp. 976-980 ◽  
Author(s):  
Marios Zouridakis ◽  
Petros Giastas ◽  
Eleftherios Zarkadas ◽  
Dafni Chroni-Tzartou ◽  
Piotr Bregestovski ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Nicotinic Receptor ◽  
Bound States ◽  
Extracellular Domain

scholarly journals New crystal structures of adenylate kinase fromStreptococcus pneumoniaeD39 in two conformations

2014 ◽  
Vol 70 (11) ◽  
pp. 1468-1471
Author(s):  
Trung Thanh Thach ◽  
Sangho Lee
Keyword(s):  
Crystal Structures ◽  
Adenylate Kinase ◽  
Bound States ◽  
Critical Role ◽  
Unit Cell ◽  
Unit Cell Parameters ◽  
Space Group ◽  
Cell Parameters ◽  
Ligand Free ◽  
Adenylate Kinases

Adenylate kinases (AdKs; EC 2.7.3.4) play a critical role in intercellular homeostasis by the interconversion of ATP and AMP to two ADP molecules. Crystal structures of adenylate kinase fromStreptococcus pneumoniaeD39 (SpAdK) have recently been determined using ligand-free and inhibitor-bound crystals belonging to space groupsP21andP1, respectively. Here, new crystal structures of SpAdK in ligand-free and inhibitor-bound states determined at 1.96 and 1.65 Å resolution, respectively, are reported. The new ligand-free crystal belonged to space groupC2, with unit-cell parametersa= 73.5,b= 54.3,c= 62.7 Å, β = 118.8°. The new ligand-free structure revealed an open conformation that differed from the previously determined conformation, with an r.m.s.d on Cαatoms of 1.4 Å. The new crystal of the complex with the two-substrate-mimicking inhibitorP1,P5-bis(adenosine-5′-)pentaphosphate (Ap5A) belonged to space groupP1, with unit-cell parametersa= 53.9,b= 62.3,c= 63.0 Å, α = 101.9, β = 112.6, γ = 89.9°. Despite belonging to the same space group as the previously reported crystal, the new Ap5A-bound crystal contains four molecules in the asymmetric unit, compared with two in the previous crystal, and shows slightly different lattice contacts. These results demonstrate that SpAdK can crystallize promiscuously in different forms and that the open structure is flexible in conformation.

scholarly journals Crystal Structures of S100A6 in the Ca2+-Free and Ca2+-Bound States

Structure ◽  
2002 ◽  
Vol 10 (4) ◽  
pp. 557-567 ◽  
Author(s):  
Ludovic R. Otterbein ◽  
Jolanta Kordowska ◽  
Carlos Witte-Hoffmann ◽  
C.-L.Albert Wang ◽  
Roberto Dominguez
Keyword(s):  
Crystal Structures ◽  
Bound States

Insights into metal ion binding in phospholipases A2: ultra high-resolution crystal structures of an acidic phospholipase A2 in the Ca2+ free and bound states

Biochimie ◽  
2006 ◽  
Vol 88 (5) ◽  
pp. 543-549 ◽  
Author(s):  
M.T. Murakami ◽  
A. Gabdoulkhakov ◽  
N. Genov ◽  
A.C.O. Cintra ◽  
C. Betzel ◽  
...  
Keyword(s):  
High Resolution ◽  
Phospholipase A2 ◽  
Crystal Structures ◽  
Metal Ion ◽  
Bound States ◽  
Ion Binding ◽  
Metal Ion Binding ◽  
Phospholipases A2

scholarly journals The Domain Structure of ICAM-1 and the Kinetics of Binding to Rhinovirus

1998 ◽  
Vol 72 (7) ◽  
pp. 6244-6246 ◽  
Author(s):  
José M. Casasnovas ◽  
Joanna K. Bickford ◽  
Timothy A. Springer
Keyword(s):  
Crystal Structures ◽  
Domain Structure ◽  
Adhesion Molecule ◽  
Extracellular Domain ◽  
Intercellular Adhesion ◽  
Intercellular Adhesion Molecule ◽  
Intercellular Adhesion Molecule 1 ◽  
X Ray ◽  
Kinetics Of

ABSTRACT Fragments of intercellular adhesion molecule 1 (ICAM- 1) containing only the two most N terminal of its five immunoglobulin SF domains bind to rhinovirus 3 with the same affinity and kinetics as a fragment with the entire extracellular domain. The fully active two-domain fragments contain 5 or 14 more residues than a previously described fragment that is only partially active. Comparison of X-ray crystal structures show differences at the bottom of domain 2. Four different glycoforms of ICAM- 1 bind with identical kinetics.

scholarly journals A model of the nicotinic receptor extracellular domain based on sequence identity and residue location

1997 ◽  
Vol 73 (1) ◽  
pp. 52-66 ◽  
Author(s):  
I. Tsigelny ◽  
N. Sugiyama ◽  
S.M. Sine ◽  
P. Taylor
Keyword(s):  
Nicotinic Receptor ◽  
Extracellular Domain ◽  
Sequence Identity

scholarly journals Crystal Structures of SlyA Protein, a Master Virulence Regulator ofSalmonella, in Free and DNA-bound States

2011 ◽  
Vol 286 (25) ◽  
pp. 22178-22185 ◽  
Author(s):  
Kyle T. Dolan ◽  
Erica M. Duguid ◽  
Chuan He
Keyword(s):  
Crystal Structures ◽  
Bound States ◽  
Protein A ◽  
Virulence Regulator

scholarly journals Dynamic Structural Changes Accompany the Production of 2-Dihydroxypropanesulfonate by Sulfolactaldehyde Reductase

2019 ◽  
Author(s):  
Mahima Sharma ◽  
Palika Abayakoon ◽  
James P. Lingford ◽  
Yi Jin ◽  
Ruwan Epa ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Bound States ◽  
Ternary Complex ◽  
Structural Changes ◽  
Reductase Activity ◽  
Complex Structure ◽  
Peptide Sequence ◽  
Sequence Motifs ◽  
Conserved Sequence ◽  
K 12

2,3-Dihydroxypropanesulfonate (DHPS) is a major sulfur species in the biosphere. One important route for the production of DHPS includes sulfoglycolytic catabolism of sulfoquinovose (SQ) through the Embden-Meyerhof-Parnas (sulfo-EMP) pathway. SQ is a sulfonated carbohydrate present in plant and cyanobacterial sulfolipids (sulfoquinovosyl diacylglyceride and its metabolites) and is biosynthesised globally at a rate of around 10 billion tonnes per annum. The final step in the bacterial sulfo-EMP pathway involves reduction of sulfolactaldehyde (SLA) to DHPS, catalysed by an NADH-dependent SLA reductase. On the basis of conserved sequence motifs, we assign SLA reductase to the β-hydroxyacid dehydrogenase (β-HAD) family, making it the first example of a β-HAD enzyme that acts on a sulfonic acid, rather than a carboxylic acid substrate. We report crystal structures of the SLA reductase YihU from E. coli K-12 in its apo and cofactor-bound states, as well as the ternary complex YihU•NADH•DHPS with the cofactor and product bound in the active site. Conformational flexibility observed in these structures, combined with kinetic studies, confirm a sequential mechanism and provide evidence for dynamic domain movements that occur during catalysis. The ternary complex structure reveals a conserved sulfonate pocket in SLA reductase that recognises the sulfonate oxygens through hydrogen bonding to Asn174, Ser178, and the backbone amide of Arg123, along with an ordered water molecule. This triad of residues distinguishes these enzymes from classical β-HADs that act on carboxylate substrates. A comparison of YihU crystal structures with close structural homologues within the β-HAD family highlights key differences in the overall domain organization and identifies a unique peptide sequence that is predictive of SLA reductase activity.<br>

scholarly journals Dynamic Structural Changes Accompany the Production of 2-Dihydroxypropanesulfonate by Sulfolactaldehyde Reductase

2019 ◽  
Author(s):  
Mahima Sharma ◽  
Palika Abayakoon ◽  
James P. Lingford ◽  
Yi Jin ◽  
Ruwan Epa ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Bound States ◽  
Ternary Complex ◽  
Structural Changes ◽  
Reductase Activity ◽  
Complex Structure ◽  
Peptide Sequence ◽  
Sequence Motifs ◽  
Conserved Sequence ◽  
K 12

2,3-Dihydroxypropanesulfonate (DHPS) is a major sulfur species in the biosphere. One important route for the production of DHPS includes sulfoglycolytic catabolism of sulfoquinovose (SQ) through the Embden-Meyerhof-Parnas (sulfo-EMP) pathway. SQ is a sulfonated carbohydrate present in plant and cyanobacterial sulfolipids (sulfoquinovosyl diacylglyceride and its metabolites) and is biosynthesised globally at a rate of around 10 billion tonnes per annum. The final step in the bacterial sulfo-EMP pathway involves reduction of sulfolactaldehyde (SLA) to DHPS, catalysed by an NADH-dependent SLA reductase. On the basis of conserved sequence motifs, we assign SLA reductase to the β-hydroxyacid dehydrogenase (β-HAD) family, making it the first example of a β-HAD enzyme that acts on a sulfonic acid, rather than a carboxylic acid substrate. We report crystal structures of the SLA reductase YihU from E. coli K-12 in its apo and cofactor-bound states, as well as the ternary complex YihU•NADH•DHPS with the cofactor and product bound in the active site. Conformational flexibility observed in these structures, combined with kinetic studies, confirm a sequential mechanism and provide evidence for dynamic domain movements that occur during catalysis. The ternary complex structure reveals a conserved sulfonate pocket in SLA reductase that recognises the sulfonate oxygens through hydrogen bonding to Asn174, Ser178, and the backbone amide of Arg123, along with an ordered water molecule. This triad of residues distinguishes these enzymes from classical β-HADs that act on carboxylate substrates. A comparison of YihU crystal structures with close structural homologues within the β-HAD family highlights key differences in the overall domain organization and identifies a unique peptide sequence that is predictive of SLA reductase activity.<br>

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