TY - JOUR

T1 - Glycosylation of Thermomyces lanuginosa lipase enhances surface binding towards phospholipids, but does not significantly influence the catalytic activity

AU - Peters, Günther H.

AU - Svendsen, Allan

AU - Langberg, H.

AU - Vind, J.

AU - Patkar, S. A.

AU - Kinnunen, Paavo K J

PY - 2002/8/1

Y1 - 2002/8/1

N2 - Binding properties of the native Thermomyces lanuginosa lipase (Tll), the inactive mutant of Tll (S146A; active Ser146 mutated to Ala), and the non-glycosylated mutant of Tll (N33Q) were determined using fluorescence spectroscopy. Tll, S146A mutant and N33Q mutant show significant different binding behavior to phosphatidylcholine (PC) and phosphatidylglycerol (PG) liposomes. Generally, weaker association of lipase molecules is observed to PC liposomes than to PG liposomes. Strong lipase-lipid interactions are observed for the S146A mutant, which is less pronounced for Tll and the N33Q variant. Addition of fatty acid to PG liposomes reduces significantly the binding affinity of the lipases. This effect is less pronounced in fatty acid/PC liposomes. Although the catalytic activity of the N33Q mutant is comparable to Tll, the non-glycosylated variant shows generally lower binding affinity to PC or PG matrix than Tll. Addition of the substrate analog benzene boronic acid (BBA) increases the binding affinity of the S146A and N33Q mutants, while only small changes are observed for Tll suggesting that the dynamics of the active site lid influences the binding affinity and that the flexibility of the loop region 33-48 might contribute to the activation of the lipase.

AB - Binding properties of the native Thermomyces lanuginosa lipase (Tll), the inactive mutant of Tll (S146A; active Ser146 mutated to Ala), and the non-glycosylated mutant of Tll (N33Q) were determined using fluorescence spectroscopy. Tll, S146A mutant and N33Q mutant show significant different binding behavior to phosphatidylcholine (PC) and phosphatidylglycerol (PG) liposomes. Generally, weaker association of lipase molecules is observed to PC liposomes than to PG liposomes. Strong lipase-lipid interactions are observed for the S146A mutant, which is less pronounced for Tll and the N33Q variant. Addition of fatty acid to PG liposomes reduces significantly the binding affinity of the lipases. This effect is less pronounced in fatty acid/PC liposomes. Although the catalytic activity of the N33Q mutant is comparable to Tll, the non-glycosylated variant shows generally lower binding affinity to PC or PG matrix than Tll. Addition of the substrate analog benzene boronic acid (BBA) increases the binding affinity of the S146A and N33Q mutants, while only small changes are observed for Tll suggesting that the dynamics of the active site lid influences the binding affinity and that the flexibility of the loop region 33-48 might contribute to the activation of the lipase.

KW - Energy transfer

KW - Fluorescence spectroscopy

KW - Interfacial surface quality

KW - Monolayers

KW - Structure-function relationships

UR - http://www.scopus.com/inward/record.url?scp=0036071923&partnerID=8YFLogxK

U2 - 10.1016/S0927-7765(02)00030-9

DO - 10.1016/S0927-7765(02)00030-9

M3 - Journal article

AN - SCOPUS:0036071923

VL - 26

SP - 125

EP - 134

JO - Colloids and Surfaces B: Biointerfaces

JF - Colloids and Surfaces B: Biointerfaces

SN - 0927-7765

IS - 1-2

ER -