2001-95-8 Usage
Description
Valinomycin (2001-95-8) is a selective K+ ionophore capable of transporting potassium ions through lipid membranes.1 Valinomycin can induce apoptosis in cells by causing a rapid loss of mitochondrial membrane potential via potassium efflux.2,3
Chemical Properties
white crystalline powder
Uses
Different sources of media describe the Uses of 2001-95-8 differently. You can refer to the following data:
1. Insecticide, nematocide, Patterson, Wright, US 3520973 (1970 to Am. Cyanamid).
2. antibiotic; LD50 (rat, po) 4 mg/kg
3. K+-selective ionophoric cyclodepsipeptide; potassium ionophore which uncouples oxidative phosphorylation, induces apoptosis in murine thymocytes, inhibits NGF-induced neuronal differentiation and anta
gonizes ET-induced vasoconstriction. Used as insecticide, nematocide.
4. Valinomycin is a hydrophobic cyclodepsipeptide with potent antitumour activity. Valinomycin is a highly selective potassium ionophore and this action leads to a diverse range of profound cell membrane effects. More recently, valinomycin has found application as a biosensor to detect to detect potassium efflux.
5. Valinomycin is a hydrophobic cyclodepsipeptide with potent antitumor activity. Valinomycin is a highly selective potassium ionophore and this action leads to a diverse range of profound cell membrane effects. More recently, valinomycin has found application as a biosensor to detect to detect potassium efflux.
Definition
ChEBI: A twelve-membered cyclodepsipeptide composed of three repeating D-alpha-hydroxyisovaleryl-D-valyl-L-lactoyl-L-valyl units joined in sequence. An antibiotic found in severa
Streptomyces strains.
General Description
Shiny crystalline solid. Used as an insecticide and nematocide. Not registered as a pesticide in the U.S.
Reactivity Profile
VALINOMYCIN is an amide. Amides/imides react with azo and diazo compounds to generate toxic gases. Flammable gases are formed by the reaction of organic amides/imides with strong reducing agents. Amides are very weak bases (weaker than water). Imides are less basic yet and in fact react with strong bases to form salts. That is, they can react as acids. Mixing amides with dehydrating agents such as P2O5 or SOCl2 generates the corresponding nitrile. The combustion of these compounds generates mixed oxides of nitrogen (NOx).
Health Hazard
VALINOMYCIN is highly toxic orally.
Fire Hazard
When heated to decomposition, VALINOMYCIN emits toxic fumes of nitrogen oxides.
Biological Activity
Selective K + ionophore (K 0.5 values are 48, 73, 75, 93 and 246 mM for K + , Rb + , Cs + , Na + and Li + respectively) that transports K + across biological and artificial lipid membranes. Inhibits Ca 2+ -ATPase activity and induces apoptosis through mitochondrial membrane depolarization, caspase-3 activation and phosphatidylserine translocation in vitro .
Biochem/physiol Actions
Valinomycin affects the ion transport behavior of mitochondrial systems.
in vitro
valinomycin caused substantial cho cells death within 12 h of treatment. several apoptotic events were identified in valinomycin-treated cho cells, including caspase-3 activation, phosphatidylserine (ps) membrane translocation, and mitochondrial membrane depolarization during the first few hours of treatment. k+ efflux was reduced by elevating extracellular k+ concentrations [2].
in vivo
valinomycin is irritant in the case of eye and skin contact. inhalation of valinomycin can cause breathing disturbances and even loss of conscious. lethal doses (ld50) for mouse and rabbit is 2.5 mg/kg and 5 mg/kg respectively. valinomycin also shows to provoke lots of chronic effects, including damage of the central and peripheral nervous system, eyes, lens and cornea [1].
Purification Methods
Recrystallise valinomycin from dibutyl ether or Et2O. It is dimorphic: modification A crystallises from n-octane, and modification B crystallises from EtOH/H2O. It is soluble in pet ether, CHCl3, AcOH, BuOAc and Me2CO. [Smith et al. J Am Chem Soc 97 7242 1975, UV, IR and NMR see Brocknmann & Schmidt-Kastner Chem Ber 88 57 1955, Beilstein 27 I 9728. 17 IV 9728.]
References
1) Pressman, (1976) Biological applications of ionophores; Annu. Rev. Biochem., 45 501
2) Furlong et al., (1998) Induction of apoptosis by valinomycin: mitochondrial permeability transition causes intracellular acidification; Cell Death Diff., 5 214
3) Inai et al. (1997) Valinomycin induces apoptosis of ascites hepatoma cells (AH-130) in relation to mitochondrial membrane potential; Cell Struc. Funct., 22 555
Check Digit Verification of cas no
The CAS Registry Mumber 2001-95-8 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,0,0 and 1 respectively; the second part has 2 digits, 9 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 2001-95:
(6*2)+(5*0)+(4*0)+(3*1)+(2*9)+(1*5)=38
38 % 10 = 8
So 2001-95-8 is a valid CAS Registry Number.
InChI:InChI=1/C54H90N6O18/c1-22(2)34-49(67)73-31(19)43(61)55-38(26(9)10)53(71)77-41(29(15)16)47(65)59-36(24(5)6)51(69)75-33(21)45(63)57-39(27(11)12)54(72)78-42(30(17)18)48(66)60-35(23(3)4)50(68)74-32(20)44(62)56-37(25(7)8)52(70)76-40(28(13)14)46(64)58-34/h22-42H,1-21H3,(H,55,61)(H,56,62)(H,57,63)(H,58,64)(H,59,65)(H,60,66)/t31-,32-,33-,34+,35+,36?,37-,38-,39-,40+,41+,42+/m0/s1
2001-95-8Relevant articles and documents
Thioesterase from Cereulide Biosynthesis Is Responsible for Oligomerization and Macrocyclization of a Linear Tetradepsipeptide
Boddy, Christopher N.,Heberlig, Graham W.
supporting information, (2020/07/03)
Cereulide is a toxic cyclic depsidodecapeptide produced in Bacillus cereus by two nonribosomal peptide synthetases, CesA and CesB. While highly similar in structure to valinomycin and with a homologous biosynthetic gene cluster, recent work suggests that cereulide is produced via a different mechanism that relies on a noncanonical coupling of two didepsipeptide-peptidyl carrier protein (PCP) bound intermediates. Ultimately this alternative mechanism generates a tetradepsipeptide-PCP bound intermediate that differs from the tetradepsipeptide-PCP intermediate predicted from canonical activity of CesA and CesB. To differentiate between the mechanisms, both tetradepsipeptides were prepared as N-acetyl cysteamine thioesters (SNAC), and the ability of the purified recombinant terminal CesB thioesterase (CesB TE) to oligomerize and macrocyclize each substrate was probed. Only the canonical substrate is converted to cereulide, ruling out the alternative mechanism. It was demonstrated that CesB TE can use related tetradepsipeptide substrates, such as the valinomycin tetradespipetide and a hybrid cereulide-valinomycin tetradepsipetide in conjunction with its native substrate to generate chimeric natural products. This work clarifies the biosynthetic origins of cereulide and provides a powerful biocatalyst to access analogues of these ionophoric natural products.
