Document Detail

Scorpion digestive lipase: kinetic study using monomolecular film technique.
MedLine Citation:
PMID:  16580184     Owner:  NLM     Status:  MEDLINE    
Using the classical emulsified system and the monomolecular film technique, we compared the interfacial properties of the scorpion digestive lipase (SDL) with those of higher animals'. In the absence of bile slats, SDL does not hydrolyse efficiently pure tributyrin, as well as dicaprin films maintained at low surface pressure. The preincubation of bile salts with tributyrin seems to be a better substrate for SDL than the pure tributyrin. A kinetic study on the surface pressure dependency, stereospecificity and regioselectivity of SDL was performed using monomolecular films of either three dicaprin isomers or three pairs of didecanoyl-deoxyamino-O-methyl glycerol enantiomers (DDG) containing a single hydrolysable decanoyl ester bond. With all diacylglycerol isomers, SDL has a surface pressure threshold of about 15 m Nm(-1), below which enzymatic activity is undetectable. SDL seems to prefer vicinal ester groups of the diacylglycerol isomers, with preference for sn-1 position at both 15 and 23 m Nm(-1). Furthermore, the maximum SDL activity is measured with DDG having a primary ester bond (1,3DDG, SII). This shows that SDL has a preference for the sn-1 position of this diacylglycerol analogue. Moreover, this was in line with the fact that SDL is inactive on sn-2 position of both DDG isomers and a triacylglycerol. With diacylglycerol analogue isomers, SDL shows a preference for distal isomers contrary to what has been observed with diacylglycerol isomers. SDL interacts with egg-phosphatidyl choline (egg-PC) monomolecular films. The critical surface pressure value (13 m Nm(-1)) is comparable to those of pancreatic lipases.
Nacim Zouari; Adel Sayari; Nabil Miled; Robert Verger; Youssef Gargouri
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-03-30
Journal Detail:
Title:  Colloids and surfaces. B, Biointerfaces     Volume:  49     ISSN:  0927-7765     ISO Abbreviation:  Colloids Surf B Biointerfaces     Publication Date:  2006 Apr 
Date Detail:
Created Date:  2006-05-01     Completed Date:  2006-07-31     Revised Date:  2009-10-16    
Medline Journal Info:
Nlm Unique ID:  9315133     Medline TA:  Colloids Surf B Biointerfaces     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  8-14     Citation Subset:  IM    
Laboratoire de Biochimie et de Genie Enzymatique des Lipases, ENIS, BPW 3038 Sfax, Tunisia.
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MeSH Terms
Bile Acids and Salts / chemistry
Diglycerides / chemistry
Egg Yolk / chemistry
Glycerides / chemistry
Hepatopancreas / enzymology
Lipase / chemistry*
Membranes, Artificial*
Phosphatidylcholines / chemistry
Substrate Specificity
Surface Properties
Time Factors
Reg. No./Substance:
0/Bile Acids and Salts; 0/Diglycerides; 0/Glycerides; 0/Membranes, Artificial; 0/Phosphatidylcholines; 0/didecanoyl-deoxyamino-O-methyl glycerol; 17863-69-3/1,2-didecanoylglycerol; EC

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