Organometallic Ligands

<p>Axltide-is a substrate peptide for use in kinase assays and is based on the mouse insulin receptor substrate 1 (IRS1) (amino acid 979-989).IRS1 is a membrane-proximal adaptor protein, which binds to, and is phosphorylated by, the insulin receptor (IR) at its tyrosine residue. IRS1 transmits the extracellular signal for insulin to serine/threonine kinases, such as Akt which then deliver the signal into the cell to mediate the various actions of insulin.</p>

<p>Peptide derived from the endothelial nitric oxide synthase which synthesises nitric oxide in order to protect endothelial cells from vascular diseases, atherosclerosis and thrombosis.</p>

<p>Phosphorylated EGFR peptide substrate.</p>

<p>Amino acids 487-496 of Poly(ADP-ribose) polymerase 1 (PARP1). PARP1 is a nuclear DNA repair enzyme that binds to DNA when damage is detected. PARP1 coordinates double and single strand break repair by first cleaving NAD+ into nicotinamide and ADP-ribose, and then synthesising poly-(ADP-ribose) (PAR) chains from ADP-ribose on target proteins (PARylation). PARylation of histone proteins mediates relaxation of the chromatin and recruitment of DNA-break repair enzymes.PARP1 can also act as a transcriptional co-activator, modulating the expression of itself and many other genes by direct binding to or PARylation of enhancers and promoters. PARP1 is also involved in maintaining mtDNA.PARP1 belongs to the PARP family which has 7 known and 10 putative members. PARP1 accounts for &gt;85% of the PARP activity in cellular systems.</p>

<p>A glycogen synthase kinase 3β- (GSK3β-) / crosstide fragment representing the phosphorylation site on GSK3β-. GSK3β- is a serine/threonine kinase which regulates glycogen synthase activity and is a key mediator of vertebrate development, tumourigenesis and cell differentiation. GSK3β- is phosphorylated by activated AKT/protein kinase B on serine 9- promoting its inactivation.</p>

<p>Acid α-glucosidase (83-99) (human) is derived from the exogenous enzyme which degrades glycogen, maltose and isomaltose through targeting alpha -1,4 and alpha -1,6 linkages. Once synthesised in its precursor form, within the Golgi it is glycosylated and acquires mannose 6-phosphate residues. This allows it to be transported to the Lysosome in a multistep process.Pompe disease, also known as glycogen storage disease type II, can be diagnosed through the absence of acid α-glucosidase activity within patients. Therefore glycogen degradation in the lysosome is inhibited by this autosomal recessive disorder. This results in the accumulation of glycogen and tissue destruction, hence contributing to the pathologies of muscle weakness and respiratory failure, associated with infantile onset and adult onset Pompe disease.</p>

<p>eV1-2 is a selective εPKC inhibitor peptide which interferes with protein-protein interactions between the ϵPKC isozyme and its anchoring protein (ϵRACK). ϵPKC and ϵRACK regulate the contraction rate of heart muscle cells and provide protection from ischemia induced cell death. ϵV1-2 is derived from the C2 domain of ϵPKC, a region important for protein-protein interactions and thus acts as a competitive inhibitor of these interactions. The C2 region is well conserved between species, but different enough from other PKC isozymes to allow for targeted inhibition (ϵV1-2 is 88% identical between sea slugs and rat ϵPKC, yet only 36% identical between rat ϵPKC and rat θ´PKC). This peptide contains a C-terminal cysteine residue for conjugation to a carrier protein.</p>

<p>Amino acids 651-660 of Poly(ADP-ribose) polymerase 1 (PARP1). PARP1 is a nuclear DNA repair enzyme that binds to DNA when damage is detected. PARP1 coordinates double and single strand break repair by first cleaving NAD+ into nicotinamide and ADP-ribose, and then synthesising poly-(ADP-ribose) (PAR) chains from ADP-ribose on target proteins (PARylation). PARylation of histone proteins mediates the relaxation of the chromatin and recruitment of DNA-break repair enzymes.PARP1 can also act as a transcriptional co-activator, modulating the expression of itself and many other genes by direct binding to or PARylation of enhancers and promoters. PARP1 is also involved in maintaining mtDNA.PARP1 belongs to the PARP family which has 7 known and 10 putative members. PARP1 accounts for &gt;85% of the PARP activity in cellular systems.</p>

<p>Ile-Pro-Pro (IPP) has the ability to inhibit angiotensin-converting enzyme and stimulate the production of nitric oxide. It could be used to improve hypertension thus reducing the risk of cardiovascular diseases.</p>

<p>Human epidermal growth factor receptor 2 (HER-2)/epidermal growth factor receptor-2 (ErbB-2), is a key receptor linked to metastasis in tumours. The oncogenic ErbB-2 receptor has intrinsic receptor tyrosine kinase (RTK) activity. The receptor is activated by ligand binding which induces receptor dimerization. These RTK complexes can activate mitogen-activated protein kinase (MAPK) and phosphoinositol 3'-kinase (PI3K)/Akt pathways. This peptide has been identified as a substrate for HER-2/ErbB-2 as it is phosphorylated upon receptor activation and therefore acts as a marker for receptor activation in kinases assays.</p>

<p>MGMT, known as O6-methylguanine-DNA methyltransferase, is a DNA repair enzyme that plays an important role in chemoresistance to alkylating agents. MGMT repairs the toxic DNA O6-Methylguanine lesion caused by Temozolomide (TMZ), an oral alkylating agent used for the treatment of glioblastoma. MGMT repairs damaged guanine nucleotides by transferring the methyl at O6 site of guanine to its cysteine residues, thus avoiding gene mutation, cell death and tumorigenesis. The expression of MGMT gene is mainly regulated by epigenetic modification. Loss of MGMT expression is due to methylation of the CpG island of MGMT promoter.</p>

<p>Amino acids 487-496 of Poly(ADP-ribose) polymerase 1 (PARP1). PARP1 is a nuclear DNA repair enzyme that binds to DNA when damage is detected. PARP1 coordinates double and single strand break repair by first cleaving NAD+ into nicotinamide and ADP-ribose, and then synthesising poly-(ADP-ribose) (PAR) chains from ADP-ribose on target proteins (PARylation). PARylation of histone proteins mediates relaxation of the chromatin and recruitment of DNA-break repair enzymes.PARP1 can also act as a transcriptional co-activator, modulating the expression of itself and many other genes by direct binding to or PARylation of enhancers and promoters. PARP1 is also involved in maintaining mtDNA.PARP1 belongs to the PARP family which has 7 known and 10 putative members. PARP1 accounts for &gt;85% of the PARP activity in cellular systems.</p>

<p>This peptide is phosphorylated by Janus kinase 2 (JAK2) and is an ideal substrate for use in kinase assays. The JAK family of kinases is essential for the signalling of a host of immune modulators in tumour, stromal, and immune cells where they are highly expressed. JAK family proteins mediate the signalling of the interferon (IFN), IL-6, and IL-2 families of cytokines.JAK kinases are associated with cytokine receptors. Cytokine binding to these receptors results in activation of JAK kinases and receptor phosphorylation. Phosphorylated cytokine receptors recruit STAT proteins, which are then phosphorylated by the activated JAK kinases. Phosphorylated STAT proteins form homo- and hetero-dimers that translocate into the nucleus and function as transcription factors.</p>

<p>LRRKtide (also called moesin) is a peptide substrate for leucine-rich repeat kinase 2 (LRRK2). The sequence of LRRKtide has been derived from the ERM proteins: Ezrin (amino acids 561-573), radixin (amino acids 558-570) and moesin (amino acids 539-553). These proteins influence cytoskeletal dynamics by anchoring the cytoskeleton to the plasma membrane. LRRK2 phosphorylates LRRKtide at its Thr558 site.LRRK2 is a large, ubiquitous protein of unknown function. LRRK2 has GTPase and kinase activity, and is located in multiple areas of the cell where it is found associated with intracellular membranes and vesicular structures. Its multiple cellular locations suggest that LRRK2 may be involved in several cellular pathways. LRRK2 is also found in most organs and mutations in LRRK2 have been identified in Parkinson's disease.This peptides has an amidated C-terminal end.</p>

<p>LRRKtide (also called moesin) is a peptide substrate for leucine-rich repeat kinase 2 (LRRK2). The sequence of LRRKtide has been derived from the ERM proteins: Ezrin (amino acids 561-573), radixin (amino acids 558-570) and moesin (amino acids 539-553). These proteins influence cytoskeletal dynamics by anchoring the cytoskeleton to the plasma membrane. LRRK2 phosphorylates LRRKtide at its Thr558 site. This peptide contains the phosphorylated threonine residue.LRRK2 is a large, ubiquitous protein of unknown function. LRRK2 has GTPase and kinase activity, and is located in multiple areas of the cell, associated with intracellular membranes and vesicular structures- suggesting LRRK2 may be involved in several cellular pathways. LRRK2 is also found in most organs and mutations in LRRK2 have been identified in Parkinson's disease.The threonine residue at position 9 of this peptide has been phosphorylated.</p>

<p>This peptide is phosphorylated by Janus kinase 1 (JAK1) and is an ideal substrate for use in kinase assays. The JAK family of kinases is essential for the signalling of a host of immune modulators in tumour, stromal, and immune cells where they are highly expressed. JAK family proteins mediate the signalling of the interferon (IFN), IL-6, and IL-2 families of cytokines.JAK kinases are associated with cytokine receptors. Cytokine binding to these receptors results in activation of JAK kinases and receptor phosphorylation. Phosphorylated cytokine receptors recruit STAT proteins, which are then phosphorylated by the activated JAK kinases. Phosphorylated STAT proteins form homo- and hetero-dimers that translocate into the nucleus and function as transcription factors.This JAK1 substrate peptide contains an N-terminal glycine-residue.</p>

<p>Substrate peptide for protein tyrosine phosphatase 1B (PTP1B)- an ubiquitously expressed non-receptor tyrosine phosphatase. PTP1B negatively regulates signalling pathways controlling metabolic homeostasis, cell proliferation and immunity (such as leptin and insulin receptor signalling), making PTP1B an interesting target for type 2 diabetes mellitus (T2DM) and obesity treatment. PTP1B also has important leptin-independent metabolic effects, playing a critical role in the regulation of inflammation, cell proliferation, differentiation and invasion. Therefore PTP1B is also interesting as a therapeutic target for inflammatory and autoimmune diseases and cancer.-For application data please see: Figure 2 supplement 1C.</p>

<p>A protein kinase G selective substrate for use in kinases assays, with a preference for PKG Ialpha over PKG II. PKG is a serine/threonine-specific protein kinase activated by cyclin guanosine monophosphate (cGMP). PKG is involved in several signalling pathways including: smooth muscle relaxation, platelet function, cell division, nucleic acid synthesis and sperm metabolism.</p>

<p>ERKtide Substrate Peptide.</p>

<p>Ruxolitinib is a janus tyrosine kinase inhibitor active specifically on sub-types JAK1 and JAK2 with IC50 values in the nanomolar range. JAK1 and JAK2 are kinases involved in the regulation of hematopoiesis. Clinically applied to the treatment of intermediate and high-risk myelofibrosis, ruxolitinib is usually well tolerated by patients.</p>