Nakagawa K, Nakamura K, Haishima Y, Yamagami M, Saito K, Sakagami H, Ogawa H. Pseudoproteoglycan (pseudoPG) probes that simulate PG macromolecular structure for screening and isolation of PG-binding proteins.
Glycoconj J 2010;
26:1007-17. [PMID:
19234786 DOI:
10.1007/s10719-008-9220-y]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2008] [Revised: 09/30/2008] [Accepted: 12/08/2008] [Indexed: 12/26/2022]
Abstract
A proteoglycan (PG) monomer is a macromolecule consisting of one or more glycosaminoglycan (GAG) chains attached to a core protein. PGs have signaling roles and modulatory functions in the extracellular matrix and at the cell surface. To elucidate the functions of higher-order PG structures, pseudoPGs that imitate the PG structure were prepared to develop probes and affinity adsorbents. Poly-L: -lysine (PLL) or polyacrylamide (PAA) was coupled with various GAGs, then biotinylated, and the remaining amino groups were blocked to obtain the pseudoPG probes, biotinyl PLL (BPL)- or PAA (BPA)-GAGs. Lactoferrin exhibited 30-times higher affinity toward BPL-heparin than the conventional single-strand probe, biotin-hydrazide-heparin. Heparin-PLL was immobilized on a formyl-Sepharose and compared with the Hep-Sepharose in which heparin was directly immobilized to amino-Sepharose. Screening for ligands in normal rat brain revealed several proteins that specifically bound to either of the two adsorbents, indicating that the heparin-binding proteins exhibit specific recognition depending on the higher-order structure of the PG.
Collapse