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Development of isoperoxidases along the growth gradient in the mung bean hypocotyl |
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| Affiliation: | 1. Research and Development Division, Kyokuto Pharmaceutical Industrial Co., Ltd, 3333-26, Aza-Asayama, Kamitezuna Takahagi-shi, Ibaraki, 318-0004, Japan;2. Abwiz Bio Inc., 9823 Pacific Heights Blvd Ste J, San Diego, CA, 92121, USA;3. The Institute of Medical Sciences, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan;4. School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan;5. Alliance Protein Laboratories, 13380 Pantera Road, San Diego, CA, 92130, USA |
| Abstract: | Cytoplasmic and wall bound peroxidases were extracted from successive segments of decreasing growth potential along the mung bean hypocotyl. Active wall bound peroxidases were present in the epidermis and external parenchyma layers at the end of the elongation phase. Two fast migrating anionic isoperoxidases covalently bound to the cell walls increased when the cell walls lost their plasticity. These isoenzymes were characterized by a high affinity for several peroxidase substrates and high thermal stability. |
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