Functional characterization of T7 and T8 of human apolipoprotein (a).

Abstract:

:Lipoprotein (a) [Lp(a)], a risk factor for coronary artery disease, is a LDL-like particle with apolipoprotein (a) [apo(a)] covalently linked to apolipoprotein B (apoB). Apo(a) has many repeats of kringle 4-like domain, classified as type 1 through type 10 (T1-T10). Deletion analysis was performed to define the functional modules of human apo(a). We found that T7 has an affinity for cell surfaces and is required for Lp(a) formation. Cell surface binding was inhibited by L-proline, KI = 4.7 +/- 3.6 mM (n=3). We also found that T8 has an affinity for subendothelial extracellular matrix (ECM). ECM binding was inhibited modestly by L-proline (KI = 6.1 +/- 1.9 mM, n=3), and more effectively by L-lysine (KI = 2.7 +/- 1.0 mM, n=3) and its analogue, 6-aminohexanoic acid (KI = 0.35 +/- 0.13 mM, n=3). These data point to T7 and T8 as important functional modules of apo(a).

authors

Trieu VN,McConathy WJ

doi

10.1006/bbrc.1998.9478

subject

Has Abstract

pub_date

1998-10-09 00:00:00

pages

356-9

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(98)99478-5

journal_volume

251

pub_type

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