Abstract：
:Two distinct regions of angiogenin are critical for angiogenic activity: a catalytic site capable of cleaving RNA and a noncatalytic site, encompassing residues 60-68, which may bind to an endothelial cell-surface receptor [Hallahan, T. W., Shapiro, R., & Vallee, B. L. (1991) Proc. Natl. Acad. Sci. U.S.A. 88, 2222-2226]. We have now shown that Asn-61 is an essential residue within the cell-binding site and that in addition a segment containing Asn-109 is part of this site. Both asparagines undergo nonenzymatic deamidation during long-term storage or treatment at alkaline pH. While the isolated desamido-61 and desamido-109 derivatives retain nearly full enzymatic activity, their angiogenic activity on the chicken embryo chorioallantoic membrane is markedly attenuated and they do not inhibit angiogenin-induced neovascularization. Tryptic peptide mapping and Edman degradation demonstrate that the isolated deamidated derivatives primarily contain isoaspartic rather than aspartic acid at the positions in question (83% for desamido-61, greater than 99% for desamido-109). Aspartic acid replacement of Asn-61 and Asn-109 by site-directed mutagenesis results in the same ribonucleolytic and angiogenic activities as those of the spontaneous deamidation products. However, the aspartyl derivatives differ strikingly from their isoaspartyl counterparts in that they do inhibit angiogenin-induced angiogenesis. These results indicate that the combination of ribonucleolytic activity and receptor-binding capacity is not sufficient for angiogenic activity and that Asn-61 and Asn-109 within the noncatalytic site are required for some additional function, as yet undefined.(ABSTRACT TRUNCATED AT 250 WORDS)
journal_name
Biochemistryjournal_title
Biochemistryauthors
Hallahan TW,Shapiro R,Strydom DJ,Vallee BLdoi
10.1021/bi00149a036subject
Has Abstractpub_date
1992-09-01 00:00:00pages
8022-9issue
34eissn
0006-2960issn
1520-4995journal_volume
31pub_type
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