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Poly(L-proline)-binding Proteins From Chick Embryos Are a Profilin and a Profilactin

Poly(L-proline)-binding Proteins From Chick Embryos Are a Profilin and a Profilactin

M Tanaka, H Shibata

Eur J Biochem. 1985 Sep 2;151(2):291-7.

PMID: 3928377

Abstract:

Two poly(L-proline)-binding proteins (PBP-1 and PBP-2) were purified from chick embryos by using a poly(L-proline)-agarose column. PBP-1 was composed of two different polypeptides (molecular masses of 42 kDa and 15 kDa). The molar ratio of the two proteins in the complex was 1:1. The other poly(L-proline)-binding protein, PBP-2, was the 15-kDa protein itself. The 42-kDa protein was confirmed to be an actin from the amino acid composition, by immunochemical evidence and by its ability to self-polymerize. In addition, the 42 + 15-kDa protein complex (PBP-1) inhibited DNase I, just as a monomeric actin did. The amino acid composition of the 15-kDa protein was similar to that of mammalian profilin and it inhibited the salt-induced polymerization of rabbit skeletal muscle actin. Therefore, we conclude that the two poly(L-proline)-binding proteins from the chick embryo are a profilactin and a profilin in chick embryo. The ability of profilactin to bind poly(L-proline) must be due to profilin itself, because the profilin has a greater affinity for poly(L-proline) than does profilactin. Additionally, both the monomeric and filamentous actin from rabbit skeletal muscle have no affinity for poly(L-proline).

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP25191133	Poly-L-proline		25191-13-3	Price

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