期刊
BIOMETALS
卷 15, 期 4, 页码 421-427出版社
KLUWER ACADEMIC PUBL
DOI: 10.1023/A:1020220812484
关键词
carbonic anhydrase (CA); GIF (Cu4Zn3MT-3); zinc transfer; kinetic
Neuronal growth inhibitory factor (GIF) of porcine brain, was isolated and purified by a similar procedure which was used on the isolation of human and bovine GIF. The native porcine protein with stoichiometry of 4Cu(+), 3Zn(2+) was obtained for the first time. The kinetics of zinc transfer from Cu4Zn3MT-3 to apo-carbonic anhydrase were studied, and zinc transfer rate constants and thermodynamic parameters were obtained. It is found that like other MTs, porcine Cu4Zn3MT-3 can also transfer its zinc atom to apoCA, even much easier than other MTs. A possible association mechanism has been proposed, the formation of Cu(4)Zn(3)MT3-apoCA complex may be the rate-determining step. The obtained data indicate besides its neuronal growth inhibitory function, GIF might play a role in cellular Zn homeostasis in brain.
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