EGF-receptor (EGF-R) tyrosine kinase is required for the down-regulation of activated EGF-R. However, controversy exists as to whether ligand-induced activation of the EGF-R tyrosine kinase is required for internalization or for lysosomal targeting. We have addressed this issue using a cell-free assay that selectively measures the recruitment of EGF-R into coated pits. Here we show that EGF bou...

In Gram-positive bacteria, tyrosine kinases are split into two proteins, the cytoplasmic tyrosine kinase and a transmembrane adaptor protein. In Streptococcus pneumoniae, this transmembrane adaptor is CpsC, with the C terminus of CpsC critical for interaction and subsequent tyrosine kinase activity of CpsD. Topology predictions suggest that CpsC has two transmembrane domains, with the N and C t...

To demonstrate that herbaceous biomass is a versatile gene resource, we focused on the model plant Brachypodium distachyon, and screened the B. distachyon for homologs of tyrosine decarboxylase (TDC), which is involved in the modification of aromatic compounds. A total of 5 candidate genes were identified in cDNA libraries of B. distachyon and were introduced into Saccharomyces cerevisiae to ev...

Signal transducer and activator of transcription (STAT) proteins are both tyrosine- and serine-phosphorylated, mediating signal transduction and gene regulation. Following gene regulation, STAT activity in the nucleus is then terminated by a nuclear protein phosphatase(s), which remains unidentified. Using novel antibody arrays to screen the Stat1-specific protein phosphatase(s), we identified ...

a natural sidechain that is derivatized (" caged ") by a photosensitive group. The photochemical strategy employs the well-characterized ortho-nitrobenzyl group Oocytes synthesize and incorporate into their membranes a channel in which such a caged side-Pasadena, California 91125 chain occupies a selected position. Later, while the cell is under voltage-clamp study, a light flash photolyzes (" ...

Bacteria have acquired resistance against almost all antibiotics because of the misuse antibacterial agents and long periods treatment. Antimicrobial peptides (AMPs) are one most encouraging candidates to solve this problem, as they possess high prokaryotic selectivity, affect bacteria by a unique mode action. Novel cyclic undecapeptides (QNRNFYFNRNQ QNRNFHFNRNQ) their linear counterparts were ...

The dual specificity phosphatases (DUSPs) are a subfamily within the protein tyrosine phosphatase (PTP) family, with the unique property of being able to hydrolyze phosphoserine or phospho-threonine residues and phospho-tyrosine residues [1]. All DUSPs share the characteristic Class I PTP consensus sequence, D...HC(X)5RS/T, with C representing the essential catalytic cysteine [1]. Unlike other ...

Receptor Tyrosine kinases (RTKs) play a crucial role in the signal transduction pathways at cellular levels. RTK plays vital communication and transmission of signals to adjacent cells regulates different functions cell, such as growth, differentiation, metabolism motility. s triggers growth factor receptors epidermal factor, insulin factor-1 receptor, platelet derived fibro blast receptor vasc...

The inhibition of growth hormone (GH) signaling by five members of the GH-inducible suppressor of cytokine signaling (SOCS/CIS) family was investigated in transfected COS cells. Complete inhibition of GH activation of the signal transducer STAT5b and STAT5b-dependent transcriptional activity was observed upon expression of SOCS-1 or SOCS-3, while partial inhibition (CIS, SOCS-2) or no inhibitio...

Acute exposure to cold stress has been shown to impair short-term, or working, memory, which may be related to reduction in, or disruption of, sustained release of brain catecholamines. Administering a supplemental dose of the catecholamine precursor tyrosine may alleviate cold stress-induced memory impairments by preventing cold-induced deficits in brain catecholamine levels. The present exper...