THE PISCINE PLASMA RETINOL-BINDING PROTEIN - PURIFICATION, PARTIAL AMINO-ACID-SEQUENCE AND INTERACTION WITH MAMMALIAN TRANSTHYRETIN OF RAINBOW-TROUT (ONCORHYNCHUS-MYKISS) RETINOL-BINDING PROTEIN

被引:37
作者
BERNI, R [1 ]
STOPPINI, M [1 ]
ZAPPONI, MC [1 ]
机构
[1] UNIV PAVIA,DEPT BIOCHEM,I-27100 PAVIA,ITALY
来源
EUROPEAN JOURNAL OF BIOCHEMISTRY | 1992年 / 204卷 / 01期
关键词
D O I
10.1111/j.1432-1033.1992.tb16610.x
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
1. Retinol-binding protein (RBP) has been isolated from the pooled plasma or rainbow trouts (Oncorhinchus mykiss) by gel filtration, hydrophobic interaction chromatography and ion-exchange chromatography. By this procedure two forms of the protein, both with a molecular mass (approximately 20 kDa) similar to that of mammalian RBP, were purified to homogeneity. Five amino acid substitutions have been found in the partial (about 60%) sequences of the two forms of trout RBP, which are presumably acetylated at their N terminus. The apparent participation of six conserved cysteines in the formation of disulphide bridges, as in human RBP, and the similarity (about 60%) of the amino acid sequence of trout and mammalian RBPs, indicate the existence of a similar overall structure organization in evolutionary distant RBPs. 2. Although the two forms of trout RBP are not physiologically involved in the formation of any protein-protein complex in plasma, they are capable of interacting with mammalian transthyretin, albeit with a binding affinity (K(d)' = 15 - 40-mu-M) considerably lower than that of mammalian RBP. Our data indicate that the two forms of trout RBP also possess the region that in mammalian RBP has the functional role of binding transthyretin. It is suggested that transthyretin (or a homologous protein) was modified, during phylogenetic development of the non mammalian vertebrates, to acquire a binding site for such a region of the RBP molecule.
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页码:99 / 106
页数:8
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