Sökning: WFRF:(Clausen Ib Groth) >
Lipases from Rhizom...
-
Holmquist, Mats TorstenKTH,Biokemi och biokemisk teknologi
(författare)
Lipases from Rhizomucor miehei and Humicola lanuginosa : Modification of the lid covering the active site alters enantioselectivity
- Artikel/kapitelEngelska1993
Förlag, utgivningsår, omfång ...
Nummerbeteckningar
-
LIBRIS-ID:oai:DiVA.org:kth-74874
-
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-74874URI
-
https://doi.org/10.1007/BF01024933DOI
Kompletterande språkuppgifter
-
Språk:engelska
-
Sammanfattning på:engelska
Ingår i deldatabas
Klassifikation
-
Ämneskategori:ref swepub-contenttype
-
Ämneskategori:art swepub-publicationtype
Anmärkningar
-
Chemicals/CAS: 1,2-cyclohexanedione, 765-87-7; Arginine, 74-79-3; Cyclohexanones; Decanoates; Enzymes, Immobilized; Lipase, EC 3.1.1.3; Phenylglyoxal, 1074-12-0 NR 20140805QC 20180614
-
The homologous lipases from Rhizomucor miehei and Humicola lanuginosa showed approximately the same enantioselectivity when 2-methyldecanoic acid esters were used as substrates. Both lipases preferentially hydrolyzed the S- enantiomer of 1-heptyl 2-methyldecanoate (R. miehei: E(S) = 8.5; H. lanuginosa: E(S) = 10.5), but the R-enantiomer of phenyl 2-methyldecanoate (E(R) = 2.9). Chemical arginine specific modification of the R. miehei lipase with 1,2-cyclohexanedione resulted in a decreased enantioselectivity (E(R) = 2.0), only when the phenyl ester was used as a substrate. In contrast, treatment with phenylglyoxal showed a decreased enantioselectivity (E(S) = 2.5) only when the heptyl ester was used as a substrate. The presence of guanidine, an arginine side chain analog, decreased the enantioselectivity with the heptyl ester (E(S) = 1.9) and increased the enantioselectivity with the aromatic ester (E(R) = 4.4) as substrates. The mutation, Glu 87 Ala, in the lid of the H. lanuginosa lipase, which might decrease the electrostatic stabilization of the open-lid conformation of the lipase, resulted in 47% activity compared to the native lipase, in a tributyrin assay. The Glu 87 Ala mutant showed an increased enantioselectivity with the heptyl ester (E(S) = 17.4) and a decreased enantioselectivity with the phenyl ester (E(R) = 2.5) as substrates, compared to native lipase. The enantioselectivities of both lipases in the esterification of 2-methyldecanoic acid with 1-heptanol were unaffected by the lid modifications.
Ämnesord och genrebeteckningar
-
NATURVETENSKAP Kemi Organisk kemi hsv//swe
-
NATURAL SCIENCES Chemical Sciences Organic Chemistry hsv//eng
-
alanine
-
arginine
-
decanoic acid derivative
-
ester
-
guanidine
-
heptanol
-
phenylglyoxal
-
triacylglycerol lipase
-
article
-
chemical modification
-
enantiomer
-
enzyme activation
-
enzyme active site
-
enzyme conformation
-
enzyme substrate
-
esterification
-
gas chromatography
-
hydrolysis
-
lipid metabolism
-
nonhuman
-
site directed mutagenesis
-
Comparative Study
-
Cyclohexanones
-
Decanoates
-
Enzymes
-
Immobilized
-
Kinetics
-
Lipase
-
Mitosporic Fungi
-
Mucorales
-
Stereoisomerism
-
Substrate Specificity
-
Support
-
Non-U.S. Gov't
-
Humicola
-
Rhizomucor miehei
-
Thermomyces lanuginosus
Biuppslag (personer, institutioner, konferenser, titlar ...)
-
Martinelle, MatsKTH,Industriell bioteknologi(Swepub:kth)u1yqglux
(författare)
-
Berglund, P.Mid Sweden University(Swepub:kth)u1271chh
(författare)
-
Clausen, Ib GrothNovo-Nordisk A/S, Bagsvaerd, Denmark
(författare)
-
Patkar, Shamkant
(författare)
-
Svendsen, AllanNovo-Nordisk A/S, Bagsvaerd, Denmark
(författare)
-
Hult, KarlKTH,Biokemi och biokemisk teknologi(Swepub:kth)u1nzlwuj
(författare)
-
KTHBiokemi och biokemisk teknologi
(creator_code:org_t)
Sammanhörande titlar
-
Ingår i:Journal of Protein Chemistry12:6, s. 749-7570277-8033
Internetlänk
Hitta via bibliotek
Till lärosätets databas