Anti-CRAT monoclonal antibody Made to order

In eukaryotes, choline acetyltransferase (ChAT) catalyzes the reversible formation of the neurotransmitter acetylcholine from choline and acetyl-CoA. ChAT belongs to a family of CoA-dependent enzymes that also includes the carnitine acyltransferases CrAT, CrOT, and CPTs. In contrast to CrOT and CPTs that are very active toward medium-and long-chain acyl-CoAs, respectively, CrAT and ChAT display activity toward only short-chain acyl-CoAs. We recently demonstrated the substrate and cosubstrate promiscuity of the wild-type human ChAT (hChAT). To extend the flexibility of this enzyme, we have generated a series of single, double, and triple hChAT mutants. Here we report the conversion of hChAT into choline octanoyltransferase (ChOT) and choline palmitoyltransferase (ChPT). The E337 and C550 residues (numbering from hChAT) were previously shown to dictate the acyl-CoA cosubstrate specificity in the carnitine series. Here we identify and demonstrate the importance of C551, in addition to E337 and C550, in contributing to the acyl-CoA specificity of hChAT. We also show that either C550 or C551 needs to be present for the transfer of medium-and long-chain acyl-CoAs by hChAT. By exploring the potential expansion of the tunnel on the substrate side, we demonstrate that residues M84, Y436, and Y552 play a critical role in binding and holding the choline substrate in the ChAT active site.

The Remote Associates Test (RAT) is an important measurement of creativity and is well known because it is simple to use and the results are objective. To determine how the RAT would work for native Mandarin speakers, RAT was translated into Chinese in 2004 in a version called the CRAT. However, the construct validity of the CRAT was absent, and correlations with other creativity tasks, such as the Divergent Thinking Test and Creative Tendency Inventory, were not significant. Thus, the validity of the CRAT is limited. To enhance the CRAT, based on the remote association of the Association theory, the present study initiates a new approach to redesign the CRAT by developing a set of remote associate items with low frequency vocabularies and a set of close associate items with high frequency vocabularies, according to the associative hierarchies. By investigating the performance of 49 participants on these remote and close associate items, we determine the passing rate, response time, and the correlations with the Divergent Thinking Test and the insight problems task as well as the validity of the CRAT in the measurement of creativity. We find that the passing rate of remote associate items was lower than that of the close associate items as it took more time to solve remote associate items than close ones. The remote associate items were positively correlated to the Divergent Thinking Test and the insight problems task, but the close associate items were not related to these tasks. The passing rates of remote associate items and close associate items were higher in high creativity groups than low creativity groups. The construct of the present CRAT is strongly correlated with creativity and is now effective for measuring the creativity of Mandarin language speakers. (C) 2017 Elsevier Ltd. All rights reserved.