AI Article Synopsis

  • Researchers are focusing on performing transesterifications in water to create more eco-friendly biocatalytic processes in lipid biotechnology, utilizing lipase/acyltransferase enzymes.
  • The study identifies a new enzyme, CduLAc from Candida dubliniensis, which exhibits greater acyltransferase activity than the previously studied CpLIP2 from Candida parapsilosis, revealing important structural insights.
  • Mutations at a key serine position in these enzymes have shown significant impacts on their activity, with one specific mutation drastically enhancing the acyltransferase ability of enzyme CAL-A while maintaining its stability.

Article Abstract

Performing transesterifications in aqueous media is becoming a priority challenge in lipid biotechnology in order to develop more eco-friendly and efficient biocatalytic processes in systems containing both polar and apolar substrates. In this context, our group has explored for several years the high potential of the lipase/acyltransferase CpLIP2 from Candida parapsilosis and of several of its homologs, that catalyze efficiently acyltransfer reactions in lipid/water media with high water activity (aw>0.9). The discovery of a new member of this group, CduLAc from Candida dubliniensis, with a higher acyltransferase activity than CpLIP2, has provided a new insight on structure-function relationships in this group. Indeed, the comparison of sequences and 3D models, especially of CpLIP2 and CduLAc, with those of the phylogenetically related lipase A from Pseudozyma antarctica (CAL-A), allowed elucidating a key structural determinant of the acyltransferase activity: serine S369 in CpLIP2 and its equivalents E370 in CAL-A and A366 in CduLAc. Mutants obtained by rational design at this key position showed significant changes in acyltransfer activity. Whereas mutation S369E resulted in an increase in the hydrolytic activity of CpLIP2, S369A increased alcoholysis. More strikingly, the single E370A mutation in CAL-A drastically increased the acyltransferase activity of this enzyme, giving it the character of a lipase/acyltransferase. Indeed, this single mutation lowered the methanol concentration for which the initial rates of alcoholysis and hydrolysis are equal from 2M in CAL-A down to 0.3M in its mutant, while the exceptional stability of the parental enzyme toward alcohol and temperature was conserved.

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.bbapap.2015.11.006DOI Listing

Publication Analysis

Top Keywords

acyltransferase activity
12
key position
8
acyltransfer activity
8
candida parapsilosis
8
lipase/acyltransferase cplip2
8
pseudozyma antarctica
8
rational design
8
activity cplip2
8
activity
7
cplip2
6

Similar Publications

Background: Metabolic dysfunction-associated fatty liver disease (MAFLD) is one of the main chronic liver diseases. However, the roles of mitochondrial carnitine palmitoyl transferase-II (CPT-II) downregulation and liver cancer stem cell (LCSC) activation remain to be identified.

Aim: To investigate the dynamic alterations in CPT-II inactivity and LCSC activation during the malignant progression of MAFLD.

View Article and Find Full Text PDF

Steryl esters (SE) are a storage pool of sterols that accumulates in cytoplasmic lipid droplets and helps to maintain plasma membrane sterol homeostasis throughout plant growth and development. Ester formation in plant SE is catalyzed by phospholipid:sterol acyltransferase (PSAT) and acyl-CoA:sterol acyltransferase (ASAT), which transfer long-chain fatty acid groups to free sterols from phospholipids and acyl-CoA, respectively. Comparative mass spectrometry-based metabolomic analysis between ripe fruits and seeds of a tomato (Solanum lycopersicum cv Micro-Tom) mutant lacking functional PSAT and ASAT enzymes (slasat1xslpsat1) shows that disruption of SE biosynthesis has a differential impact on the metabolome of these organs, including changes in the composition of free and glycosylated sterols.

View Article and Find Full Text PDF

Conjugated bile acids alleviate acute pancreatitis through inhibition of TGR5 and NLRP3 mediated inflammation.

J Transl Med

December 2024

Department of Critical Care Medicine, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, People's Republic of China.

Introduction: Severe acute pancreatitis (SAP) is a crucial gastrointestinal disease characterized by systemic inflammatory responses and persistent multiple organ failure. The role of bile acids (BAs) in diverse inflammatory diseases is increasingly recognized as crucial, but the underlying role of BA conjugation remains elusive.

Objectives: Our study aim to investigate the potential role of conjugated bile acids in SAP and reveal the molecular mechanisms underlying its regulatory effects.

View Article and Find Full Text PDF

Background: Grape (Vitis vinifera L.) is one of the most important fruit products globally and has a high nutritional value with potent antioxidant and anti-cancer activities. In current years, phenylalanine application has been particularly noticed for enhancing the nutritional quality of horticultural crops.

View Article and Find Full Text PDF

The Multifaceted Anti-Atherosclerotic Properties of Herbal Flavonoids: A Comprehensive Review.

Pharmacol Res

December 2024

School of Pharmacy, Macau University of Science and Technology, Macau, 999078, China; Laboratory of Cardiovascular Diseases, Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, 100091, China. Electronic address:

Atherosclerosis (AS) is a major etiological factor underpinning a spectrum of cardiovascular diseases, leading to cerebral infarction, coronary artery disease, and peripheral vascular disease. The chronic progression of AS, spanning from initial plaque formation to the occurrence of acute cardiovascular events, underscores the complexity of AS and the challenges it presents in terms of treatment. Currently, the clinical management of AS relies predominantly on statins and proprotein convertase subtilisin/kexin type 9 inhibitors, which primarily aim to reduce low-density lipoprotein levels and have demonstrated some therapeutic efficacy.

View Article and Find Full Text PDF

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!

A PHP Error was encountered

Severity: Notice

Message: fwrite(): Write of 34 bytes failed with errno=28 No space left on device

Filename: drivers/Session_files_driver.php

Line Number: 272

Backtrace:

A PHP Error was encountered

Severity: Warning

Message: session_write_close(): Failed to write session data using user defined save handler. (session.save_path: /var/lib/php/sessions)

Filename: Unknown

Line Number: 0

Backtrace: