Recently, mutations in the connection subdomain (CN) and RNase H domain of HIV-1 reverse transcriptase (RT) were observed to exhibit dual resistance to nucleoside and nonnucleoside reverse transcriptase inhibitors (NRTIs and NNRTIs). To elucidate the mechanism by which CN and RH mutations confer resistance to NNRTIs, we hypothesized that these mutations reduce RNase H cleavage and provide more ...

UV excitation of isolated singly-charged deprotonated mononucleotide anions in the gas phase can lead to their dissociation. We present mass spectrometry results, photodepletion and photofragment action spectra on the UV-photodissociation of deprotonated 2'-deoxyribonucleobase-5'-monophosphates with adenine, cytosine, guanine and thymine as nucleobases. We observe the same anionic fragments as ...

Electron capture dissociation (ECD) of the peptide Substance P (SubP) complexed with divalent metals has been investigated. ECD of [SubP + H + M]3+ (M2+ = Mg2+ -Ba2+ and Mn2+ -Zn2+) allowed observation of a larger number of product ions than previous investigations of doubly charged metal-containing peptides. ECD of Mg-Ba, Mn, Fe, and Zn-containing complexes resulted in product ions with and wi...

A series of coordination polymers containing Cu(II) and [Au(CN)(2)](-) units has been prepared. Most of their structures incorporate attractive gold-gold interactions, thus illustrating that such "aurophilic" interactions can be powerful tools for increasing structural dimensionality in supramolecular systems. [Cu(tren)Au(CN)(2)][Au(CN)(2)] (1, tren = tris(2-ethylamino)amine) forms a cation/ani...

We have investigated temperature dependence of crystal structure of a chiral cyanide-bridged bimetallic assembly of [CuL2][Ni(CN)4]·2H2O (1) (L = (1R, 2R)-diaminocyclohexane). Cell parameters and most of bond distances decreased on cooling for 1. However, only a long Cu-N bond of semi-coordination increases on cooling, which is the first example of negative thermal elongation of specific bond d...

Catalytic C-C bond cleavage of acetonitrile and C-Si bond formation have been attained in the photoreaction of MeCN with Et3SiH in the presence of an iron complex, Cp(CO)2FeMe. This catalytic system can be applied for arylnitrile C-C bond cleavage.

We used temperature programmed reaction spectroscopy (TPRS) and molecular beam reflectivity measurements to investigate the initial dissociation of n-butane isotopologues on PdO(101) and determine kinetic parameters governing the selectivity of initial C-H(D) bond cleavage. We observe differences in the reactivity of the n-butane isotopologues on PdO(101) due to kinetic isotope effects, and fin...

In the title compound, C(6)H(13)N(3), the C=N and C-N bond lengths in the CN(3) unit are 1.3090 (17), and 1.3640 (17) (C-NH(2)) and 1.3773 (16) Å, indicating double- and single-bond character, respectively. The N-C-N angles are 116.82 (12), 119.08 (11) and 124.09 (11)°, showing a deviation of the CN(3) plane from an ideal trigonal-planar geometry. The piperidine ring is in a chair conformation....

In the crystal structure of the title compound, C(5)H(11)N(3)O, the C=N and C-N bond lengths in the CN(3) unit are 1.2971 (14), 1.3595 (14) (NH(2)) and 1.3902 (13) Å, indicating double- and single-bond character, respectively. The N-C-N angles are 115.49 (9)°, 119.68 (10)° and 124.83 (10)°, showing a deviation of the CN(3) plane from an ideal trigonal-planar geometry. The morpholine ring is in ...

Fe-mediated biological nitrogen fixation is thought to proceed via either a sequence of proton and electron transfer steps, concerted H atom transfer steps, or some combination thereof. Regardless of the specifics and whether the intimate mechanism for N2-to-NH3 conversion involves a distal pathway, an alternating pathway, or some hybrid of these limiting scenarios, Fe-NxHy intermediates are im...