2025-02-25·Zeitschrift für Kristallographie - New Crystal Structures
The crystal structure of bis(selenocyanato-κ1N)-bis(methanol)-bis((1E,2E)-1,2-bis (1-(pyridin-4-yl)ethylidene)-hydrazine)iron(II) methanol solvate, C34H44FeN10O4Se2
The Burkholderia cepacia complex (Bcc) is a group of phenotypically similar but genotypically diverse Gram-negative bacteria that pose a significant threat to public health worldwide. Due to the absence of effective therapies, the development of an effective vaccine against Bcc infection is urgently needed. Lipopolysaccharide (LPS) O-antigens of B. multivorans (BM) are attractive immunogenic components and recognized as potential target antigens for vaccine development. In this study, we designed and prepared three BM oligosaccharide-based glycoconjugates rsScpA193-1-3 with rsScpA193 as a new carrier protein. We performed preliminarily immunological assessments to determine the immunogenicity of these glycoconjugates, alongside in vitro evaluations of their capacity to bind BM cells and trigger long-term immunological memory. Our findings revealed that the synthesized conjugate rsScpA193-1exhibited stronger immunogenicity and better recognition to trisaccharide 1 and nonasaccharide 3 than the other two glycoconjugates. Moreover, rsScpA193-1 could effectively bind to BM cells in vitro and successfully induce long-lasting immunological memory. Therefore, trisaccharide 1 was identified as an effective antigenic target, and the conjugate rsScpA193-1 may represent a promising candidate for BM vaccine development. Overall, our study presented the first exploitation of immunogenicity of BM oligosaccharide-protein conjugates and significantly paved the way for Bcc vaccine development.
Fenzi Cuihua
Theoretical calculation on the CO2 hydrogenation to formic acid and design more effective iron based catalyst for this process
作者: Liu, Cong ; Hu, Xing-bang
CO2 hydrogenation is full of challenge because both H2 and CO2 are activated at the same time.This reaction also has 100% at. economy.Most of the reported catalysts for CO2 hydrogenation are based on noble metal.To find out more effective iron based catalysts for the CO2 hydrogenation to formic acid, totally, the reaction processes catalyzed by 12 different PNP-Fe (PNP = 2, 6-bis (di-tert-butylphosphinomethyl) pyridine) compounds were investigated.The theoretic calculation results revealed that the CO2 hydrogenation included two steps:H2 activation and CO2 inserting into the metal-hydride bond.The H2 activation is the rate-determining step.It was found that P atom substitution on the pyridine ring could obviously reduce the H2 activation barrier.Based on these findings, an effective Fe catalyst was designed, whose H2 activation barrier was only 85.6 kJ/mol, being comparable to the data of precious metal catalyst.The H2 activation barriers range from 85.6 to 126.4 kJ/mol for different Fe-based catalysts investigated here, indicating that the modification of ligand has great influence on the catalytic reactivity for the CO2 hydrogenation.