Characterization of a FeMo cofactor-deficient MoFe protein from a nifE-deleted strain(DJ35)of Azotobacter vinelandii
Characterization of a FeMo cofactor-deficient MoFe protein from a nifE-deleted strain (DJ35) of Azotobacter vinelandii作者机构：Key Laboratory of Photosynthesis and Environmental MolecuIar Physiology Institute of Botany Chinese Academy of Sciences Beijing 100093 China Graduate School Chinese Academy of Sciences Beijing 100039 China Key Laboratory of Photochemistry Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China Bioengineering College Fujian Normal University Fuzhou 360007 China
出 版 物：《Chinese Science Bulletin》 (CHINESE SCIENCE BULLETIN)
年 卷 期：2005年第50卷第20期
页 面：2305-2310页
核心收录：
学科分类：0710[理学-生物学] 1007[医学-药学(可授医学、理学学位)] 100705[医学-微生物与生化药学] 07[理学] 071005[理学-微生物学] 10[医学]
基 金：supported by the State Key Basic Research and Developmental Plan of China(Grant No.001CB1089-06) the National Natural Science Foundation of China(Grant No.30270296) the National Science Foundation for Distin-guished Young Scholars of China(Grant No.20403024)
摘 要：A MoFe protein (ΔnifE Av1) with a purity of ～80% was purified from a nifE-deleted mutant of Azotobacter vinelandii DJ35. Compared with MoFe protein purified from wild-type strain OP (OP Av1), ΔnifE Av1 had the same subunits composition, and had immune reaction with antibody to OP Av1, but its relative mobility in anaerobic native polyacrylamide gel electrophoresis (PAGE) was a little larger than that of OP Av1. Metal analysis showed that Mo and Fe contents of ΔnifE Av1 both apparently decreased. When complemented with OP Fe protein, ΔnifE Av1 had no C2H2-reduction activity, but it could be in vitro activated by FeMoco extracted from OP Av1. The circular dichroism (CD) spectrum of ΔnifE Av1 at ~450 nm was similar to that of OP Av1, while the EPR signal at g≈3.7 was absolutely silent, and the signal intensities at g≈4.3 and 2.0 decreased by 75% and 50%, respectively. The results indicated that ΔnifE Av1 purified from DJ35 was a FeMoco-deficient but P-cluster-con- taining MoFe protein.
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