26
|
Busetto L, Cassani MC, Mazzoni R, Albano VG, Sabatino P. One-pot synthesis of the new dianionic ligand [Na]2[C5H4CO2(CH2)2NTs]; preparation and structures of two rhodium derivatives. J Organomet Chem 2005. [DOI: 10.1016/j.jorganchem.2004.10.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
27
|
Balducci D, Grandi A, Porzi G, Sabatino P, Sandri S. Stereoselective synthesis of pseudotripeptides incorporating uncommon bis-α-aminoacid derivatives and X-ray analysis. Part 3. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.tetasy.2004.11.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
28
|
Sparla F, Fermani S, Falini G, Zaffagnini M, Ripamonti A, Sabatino P, Pupillo P, Trost P. Coenzyme site-directed mutants of photosynthetic A4-GAPDH show selectively reduced NADPH-dependent catalysis, similar to regulatory AB-GAPDH inhibited by oxidized thioredoxin. J Mol Biol 2004; 340:1025-37. [PMID: 15236965 DOI: 10.1016/j.jmb.2004.06.005] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2004] [Revised: 05/25/2004] [Accepted: 06/03/2004] [Indexed: 11/15/2022]
Abstract
Chloroplast glyceraldehyde-3-phosphate dehydrogenase (GAPDH) of higher plants uses both NADP(H) and NAD(H) as coenzyme and consists of one (GapA) or two types of subunits (GapA, GapB). AB-GAPDH is regulated in vivo through the action of thioredoxin and metabolites, showing higher kinetic preference for NADPH in the light than in darkness due to a specific effect on kcat(NADPH). Previous crystallographic studies on spinach chloroplast A4-GAPDH complexed with NADP or NAD showed that residues Thr33 and Ser188 are involved in NADP over NAD selectivity by interacting with the 2'-phosphate group of NADP. This suggested a possible involvement of these residues in the regulatory mechanism. Mutants of recombinant spinach GapA (A4-GAPDH) with Thr33 or Ser188 replaced by Ala (T33A, S188A and double mutant T33A/S188A) were produced, expressed in Escherichia coli, and compared to wild-type recombinant A4-GAPDH, in terms of crystal structures and kinetic properties. Affinity for NADPH was decreased significantly in all mutants, and kcat(NADPH) was lowered in mutants carrying the substitution of Ser188. NADH-dependent activity was unaffected. The decrease of kcat/Km of the NADPH-dependent reaction in Ser188 mutants resembles the behaviour of AB-GAPDH inhibited by oxidized thioredoxin, as confirmed by steady-state kinetic analysis of native enzyme. A significant expansion of size of the A4-tetramer was observed in the S188A mutant compared to wild-type A4. We conclude that in the absence of interactions between Ser188 and the 2'-phosphate group of NADP, the enzyme structure relaxes to a less compact conformation, which negatively affects the complex catalytic cycle of GADPH. A model based on this concept might be developed to explain the in vivo light-regulation of the GAPDH.
Collapse
|
29
|
Palazzi A, Sabatino P, Stagni S, Bordoni S, Albano VG, Castellari C. Coordinating properties of [M(CO)5(CN)]− [M=Cr; Mo; W] ligands: formation of ion pairs or dinuclear cyanide-bridged complexes, spectroscopic and X-ray diffraction studies. J Organomet Chem 2004. [DOI: 10.1016/j.jorganchem.2004.04.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
30
|
Biscarini P, Benedetti M, Ferranti F, Kuroda R, Foresti E, Sabatino P. Transfer of chirality by dithiophosphate ligands and chiral discrimination in the stereoselective formation of square-planar Ni(II) complexes. Chirality 2004; 16:251-62. [PMID: 15034908 DOI: 10.1002/chir.20022] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
In the formation reaction of Ni(2+) with the chiral racemic ligand, (R)(R)bdtp(-)/(S)(S)bdtp(-), bdtp(-) = [SSPOCH)CH(3))CH(CH(3))O](-), cyclo- O,O'-[1,2-dimethylethylene] dithiophosphato ion, the meso-complex Ni[(R)(R)(lambda)bdtp][(S)(S)(delta)-bdtp] is stereoselectively produced. The meso-complex was compared with the enantiopure crystals of (+)(589)Ni[(R)(R)(lambda)bdtp](2) or (-)(589)Ni[(S)(S)(delta)bdtp](2), as well as racemic crystals, rac-(+/-)Ni[bdtp](2), which were prepared from the solution containing the two enantiomers in a 1:1 ratio. Dissociation constants in solutions indicate different stability of the meso and enantiopure complexes depending on the solvent, whereas a more efficient crystal packing, weak H-bonding, and nonbonding interactions contribute to stabilization of the meso-species over the racemic one. Molecular structures show that the outer five-membered ligand ring adopts the half-chair conformation C(2) with either the lambda or the delta chirality and the methyl groups are in equatorial (e) positions. Enantiopure ligands of (+)(589)Ni[(R)(R)(lambda)bdtp](2) and (-)(589)Ni[(S)(S)(delta)bdtp](2) induce chirality into the symmetric SSNiSS chromophore with slightly helical distortion. Thus, their CD spectra exhibit weak negative or positive Cotton effects at 662 nm. CD spectra in L(+)- and D(-)diethyltartrate of the meso-complex and racemic crystal, rac-(+/-)Ni[bdtp](2), exhibit different weak Cotton effects of opposite sign. Complexes dissociate in methanol; rac-(+/-)Ni[bdtp](2) in methanol undergoes a crystallization-induced second-order asymmetric transformation which finally yields crystals of the meso-Ni[(R)(R)(lambda)bdtp][(S)(S)(delta)bdtp] complex.
Collapse
|
31
|
Binotti B, Carfagna C, Foresti E, Macchioni A, Sabatino P, Zuccaccia C, Zuccaccia D. Cationic olefin Pd(II) complexes bearing α-iminoketone N,O-ligands: synthesis, intramolecular and interionic characterization and reactivity with olefins and alkynes. J Organomet Chem 2004. [DOI: 10.1016/j.jorganchem.2003.11.020] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
32
|
Bellachioma G, Cardaci G, Foresti E, Macchioni A, Sabatino P, Zuccaccia C. Reactions of alkyl–iron(II) and -ruthenium(II) complexes with B(C6F5)3 and its water adducts. X-ray structure of a cyclometallated-iron(II) carbene. Inorganica Chim Acta 2003. [DOI: 10.1016/s0020-1693(03)00327-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
33
|
Falini G, Fermani S, Ripamonti A, Sabatino P, Sparla F, Pupillo P, Trost P. Dual coenzyme specificity of photosynthetic glyceraldehyde-3-phosphate dehydrogenase interpreted by the crystal structure of A4 isoform complexed with NAD. Biochemistry 2003; 42:4631-9. [PMID: 12705826 DOI: 10.1021/bi0272149] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Photosynthetic glyceraldehyde-3-phosphate dehydrogenase (GAPDH) of Spinacia oleracea belongs to a wide group of GAPDHs found in most organisms displaying oxygenic photosynthesis, including cyanobacteria, green and red algae, and higher plants. As a major catalytic difference with respect to glycolytic GAPDH, photosynthetic GAPDH exhibits dual cofactor specificity toward pyridine nucleotides with a preference for NADP(H). Here we report the crystal structure of NAD-complexed recombinant A(4)-GAPDH (NAD-A(4)-GAPDH) from Spinacia oleracea, expressed in Escherichia coli. Its superimposition onto native A(4)-GAPDH complexed with NADP (NADP-A(4)-GAPDH) pinpoints specific conformational changes resulting from cofactor replacement. In photosynthetic NAD-A(4)-GAPDH, the side chain of Asp32 is oriented toward the coenzyme to interact with the adenine ribose diol, similar to glycolytic GAPDHs (NAD-specific). On the contrary, in NADP-A(4)-GAPDH Asp32 moves away to accommodate the additional 2'-phosphate group of the coenzyme and to minimize electrostatic repulsion. Asp32 rotation is allowed by the presence of the small residue Ala40, conserved in most photosynthetic GAPDHs, replacing bulky amino acid side chains in glycolytic GAPDHs. While in NADP-A(4)-GAPDH two amino acids, Thr33 and Ser188, are involved in hydrogen bonds with the 2'-phosphate group of NADP, in the NAD-complexed enzyme these interactions are lacking. The crystallographic structure of NAD-A(4)-GAPDH highlights that four residues, Thr33, Ala40, Ser188, and Ala187 (Leu, Leu, Pro, and Leu respectively, in glycolytic Bacillus stearothermophilus GAPDH sequence) are of primary importance for the dual cofactor specificity of photosynthetic GAPDH. These modifications seem to trace the minimum evolutionary route for a primitive NAD-specific GAPDH to be converted into the NADP-preferring enzyme of oxygenic photosynthetic organisms.
Collapse
|
34
|
Busetto L, Cassani MC, Mazzoni R, Albano VG, Sabatino P, Frediani P, Rivalta E. Coordination Chemistry of Ester-Functionalized Cp Ligands. A Versatile Approach to the Chiral Hydroxyalkoxycarbonylcyclopentadienide [C5H4CO2(CHMe)2OH]-. Synthesis, Structure, and Catalytic Activity of Rhodium(I) and Iron(II) Complexes. Organometallics 2002. [DOI: 10.1021/om0205492] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
35
|
Michelin RA, Zanotto L, Braga D, Sabatino P, Angelici RJ. Transition-metal-promoted cyclization reactions of isocyanide ligands. Synthesis of cyclic aminooxycarbene complexes of platinum(II) and x-ray structure of trans-[(PPh3)2Pt[CN(C6H4Me-p)CH2CH2O]Br]BF4. Inorg Chem 2002. [DOI: 10.1021/ic00274a019] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
36
|
Braga D, Grepioni F, Sabatino P, Desiraju GR. Hydrogen Bonding in Organometallic Crystals. 1. From Carboxylic Acids and Alcohols to Carbonyl Complexes. Organometallics 2002. [DOI: 10.1021/om00021a029] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
37
|
Macchioni A, Zuccaccia C, Binotti B, Carfagna C, Foresti E, Sabatino P. Cationic olefin Pd(II) complexes bearing α-iminoketone N,O-ligands: unprecedented isomerisation of the methoxycyclooctenyl ligand. INORG CHEM COMMUN 2002. [DOI: 10.1016/s1387-7003(02)00391-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
38
|
Leoni P, Sommovigo M, Pasquali M, Midollini S, Braga D, Sabatino P. Coordinated water/anion hydrogen bonds and Pd-H bond acidity in cationic palladium(II) aquo hydrides and the x-ray crystal and molecular structures of trans-[(Cy3P)2Pd(H)(H2O)]BF4 (Cy = cyclohexyl). Organometallics 2002. [DOI: 10.1021/om00050a040] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
39
|
Caffyn AJM, Mays MJ, Solan GA, Braga D, Sabatino P, Tiripicchio A, Tiripicchio-Camellini M. Ring-expansion reactions of ligand-bridged dinuclear cobalt complexes with alkynes and with allene: crystal and molecular structures of [Co2{.mu.-PPh2CHCHC(O)CHCHPPh2}(CO)4] and [Co2{.mu.-PPh2CHCHC(O)C(CH2)2}(.mu.-PPh2)(CO)3]. Organometallics 2002. [DOI: 10.1021/om00029a050] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
40
|
Amoroso R, Cardillo G, Sabatino P, Tomasini C, Trere A. Lewis acid-promoted 1,4-addition to chiral imide derivatives in the synthesis of .beta.-amino acids. J Org Chem 2002. [DOI: 10.1021/jo00073a017] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
41
|
Di Bugno C, Pasquali M, Leoni P, Sabatino P, Braga D. Oxidative addition of phenols to bis(tricyclohexylphosphine)palladium. Synthesis and structural characterization of trans-[Pd(PCy3)2(H)(OC6H5)].C6H5OH (1) and trans-[Pd(PCy3)2(H)(OC6F5)].C6F5OH (2). Inorg Chem 2002. [DOI: 10.1021/ic00306a034] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
42
|
Battaglia A, Barbaro G, Giorgianni P, Foresti E, Sabatino P, Dondoni A. Synthesis and reactivity of N-mesitylcyclopropylideneazomethine. J Org Chem 2002. [DOI: 10.1021/jo00225a071] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
43
|
Michelin RA, Zanotto L, Braga D, Sabatino P, Angelici RJ. Transition-metal-promoted cyclization reactions of isocyanide ligands. Synthesis of cyclic diaminocarbenes from isocyanide complexes of palladium(II) and platinum(II) and x-ray structure of cis-Br2Pt[CN(C6H4-p-Me)CH2CH2N(H)](PPh3). Inorg Chem 2002. [DOI: 10.1021/ic00274a020] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
44
|
Busetto L, Cassani MC, Albano VG, Sabatino P. Coordination Chemistry of Ester-Functionalized Cp Ligands. The Atom-Economy Synthesis of Na[C5H4CO2(CH2)2OH] and Solid State Structures of [Rh{C5H4CO2(CH2)2OH}(CO)2] and [Rh2{μ-(C5H4CO2CH2)2}(NBD)2]. Organometallics 2002. [DOI: 10.1021/om0108393] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
45
|
Binotti B, Bellachioma G, Cardaci G, Macchioni A, Zuccaccia C, Foresti E, Sabatino P. Intramolecular and Interionic Structural Studies of Novel Olefin Palladium(II) and Platinum(II) Complexes Containing Poly(pyrazol-1-yl)borate and -methane Ligands. X-ray Structures of Palladium Five-Coordinate Complexes. Organometallics 2001. [DOI: 10.1021/om010751p] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
46
|
Fermani S, Ripamonti A, Sabatino P, Zanotti G, Scagliarini S, Sparla F, Trost P, Pupillo P. Crystal structure of the non-regulatory A(4 )isoform of spinach chloroplast glyceraldehyde-3-phosphate dehydrogenase complexed with NADP. J Mol Biol 2001; 314:527-42. [PMID: 11846565 DOI: 10.1006/jmbi.2001.5172] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Here, we report the first crystal structure of a photosynthetic glyceraldehyde-3-phosphate dehydrogenase (GAPDH) complexed with NADP. The enzyme, purified from spinach chloroplasts, is constituted of a single type of subunit (A) arranged in homotetramers. It shows non-regulated NADP-dependent and NAD-dependent activities, with a preference for NADP. The structure has been solved to 3.0 A resolution by molecular replacement. The crystals belong to space group C222 with three monomers in the asymmetric unit. One of the three monomers generates a tetramer using the space group 222 point symmetry and a very similar tetramer is generated by the other two monomers, related by a non-crystallographic symmetry, using a crystallographic 2-fold axis. The protein reveals a large structural homology with known GAPDHs both in the cofactor-binding domain and in regions of the catalytic domain. Like all other GAPDHs investigated so far, the A(4)-GAPDH belongs to the Rossmann fold family of dehydrogenases. However, unlike most dehydrogenases of this family, the adenosine 2'-phosphate group of NADP does not form a salt-bridge with any positively charged residue in its surroundings, being instead set in place by hydrogen bonds with a threonine residue belonging to the Rossmann fold and a serine residue located in the S-loop of a symmetry-related monomer. While increasing our knowledge of an important photosynthetic enzyme, these results contribute to a general understanding of NADP versus NAD recognition in pyridine nucleotide-dependent enzymes. Although the overall structure of A(4)-GAPDH is similar to that of the cytosolic GAPDH from bacteria and eukaryotes, the chloroplast tetramer is peculiar, in that it can actually be considered a dimer of dimers, since monomers are bound in pairs by a disulphide bridge formed across Cys200 residues. This bridge is not found in other cytosolic or chloroplast GAPDHs from animals, bacteria, or plants other than spinach.
Collapse
|
47
|
Lancaster CR, Bibikova MV, Sabatino P, Oesterhelt D, Michel H. Structural basis of the drastically increased initial electron transfer rate in the reaction center from a Rhodopseudomonas viridis mutant described at 2.00-A resolution. J Biol Chem 2000; 275:39364-8. [PMID: 11005826 DOI: 10.1074/jbc.m008225200] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
It has previously been shown that replacement of the residue His L168 with Phe (HL168F) in the Rhodopseudomonas viridis reaction center (RC) leads to an unprecedented drastic acceleration of the initial electron transfer rate. Here we describe the determination of the x-ray crystal structure at 2.00-A resolution of the HL168F RC. The electron density maps confirm that a hydrogen bond from the protein to the special pair is removed by this mutation. Compared with the wild-type RC, the acceptor of this hydrogen bond, the ring I acetyl group of the "special pair" bacteriochlorophyll, D(L), is rotated, and its acetyl oxygen is found 1.1 A closer to the bacteriochlorophyll-Mg(2+) of the other special pair bacteriochlorophyll, D(M). The rotation of this acetyl group and the increased interaction between the D(L) ring I acetyl oxygen and the D(M)-Mg(2+) provide the structural basis for the previously observed 80-mV decrease in the D(+)/D redox potential and the drastically increased rate of initial electron transfer to the accessory bacteriochlorophyll, B(A). The high quality of the electron density maps also allowed a reliable discussion of the mode of binding of the triazine herbicide terbutryn at the binding site of the secondary quinone, Q(B).
Collapse
|
48
|
Busetto L, Cassani MC, Zanotti V, Albano VG, Sabatino P. Coordination Chemistry of Cyclopentadienyl Ester-Disubstituted Ligands. Synthesis and Solid State Structures of [Na([18]-crown-6)][C5H3(CO2Et)2-1,2] and [Mn{C5H3(CO2Ph)2-1,2}(CO)3]. Organometallics 2000. [DOI: 10.1021/om000662x] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
49
|
Bellachioma G, Cardaci G, Macchioni A, Valentini F, Zuccaccia C, Foresti E, Sabatino P. Cationic Osmium(II) Acetyl Complexes Bearing Pyrazolylmethane Ligands: Intramolecular and Interionic Structure and Isolation of an Intermediate Containing the “Os−I−Ag” Moiety. Organometallics 2000. [DOI: 10.1021/om000344y] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
50
|
Arcelli A, Cerè V, Peri F, Pollicino S, Sabatino P. Synthesis and biological activity of the (−)-(2R,3S,4S)-3-azido-4-methoxy-2-(1′S-methoxy-2′-azido)ethyl-thiolane. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s0957-4166(00)00071-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|