The overall yield of the purified Al-BMP was about 15% as related to the initial amount of the hemeprotein. Al-BMP possesses extensive fluorescence

in the 550650 nm region with excitation in the porphyrin absorbance bands. The protein was shown to bind substrates of P450BM-3 (palmitic, arachidonic, and cis-parinaric acids) with affinities similar to those of the native enzyme (36 mu M). However, the substrate-induced changes in fluorescence SN-38 of Al-PP reveal the existence of a second, low-affinity substrate-binding site, which cannot be detected by the spin shift in the native, heme-containing BMP. Using fluorescence resonance energy transfer, we have demonstrated that Al-BMP forms a complex with the flavoprotein domain of P450BM-3 labeled with

7-ethylamino-3-(4′-maleimidylphenyl)-4-methylcoumarin maleimide, revealing the affinity similar to that of native BMP (Kd = 5 mu M at 0.06 M ionic strength). Therefore, aluminum-substituted BMP may serve as a valuable tool in studies on the mechanisms of interactions of P450s with their substrates and protein partners.”
“Novel geldanamycin derivative, 4,5-dihydro-thiazino-geldanamycin (3), was characterized from the gdmP mutant in Streptomyces hygroscopicus 17997, besides expected 4,5-dihydro-geldanamycin (2). The presence of this compound would suggest an unknown post-PKS modification in geldanamycin biosynthesis. Compound BTSA1 3 exhibited moderate anti-HSV-1-virus activity and higher water solubility than geldanamycin (1). Cysteine served as a precursor to synthesize 3, whose formation required obligatory enzymatic assistance.”
“Sleep deprivation impairs contextual but not cued learned fear, and it has been suggested that this SRT2104 chemical structure pattern reflects an insensitivity of the amygdala to sleep loss. The lack of effect of sleep deprivation on cued conditioning, however, might simply be due to the strong

attention drawn by the typically loud cue tone. We reduced tone volume from our standard 80 dB to either 70 or 60 dB, to test if reduced cue volume allowed effects of sleep deprivation to be detected. Using the platform-over-water method, male C57BL/6 mice were sleep-deprived for 24 h: control mice were moved to novel cages for 24 h. Mice then underwent fear conditioning with a standard “delay” protocol, and were tested for contextual and cued learning the next day. A control group received no footshock during conditioning. In the cue test, and for both cue volumes, SD had no effect on freezing to the tone, which was very robust in conditioned mice regardless of sleep treatment. As expected, freezing to the tone in the no-shock groups was essentially absent. Also, freezing prior to the tone was low in all mice. At the lowest volume, the tone was only similar to 10 dB above background noise. 24 h sleep deprivation, however, blocked contextual fear in the same mice.