Characterization of seven basic endochitinases isolated from cell cultures of Citrus sinensis (L.).

Abstract:

:Seven endochitinases (EC 3.2.1.14) (relative molecular masses 23,000-28,000 and isoelectric points 10.3-10.4) were purified from nonembryogenic Citrus sinensis L. Osbeck cv. Valencia callus tissue. The basic chitinase/lysozyme from this tissue (BCLVC) exhibited lysozyme, chitinase and chitosanase activities and was determined to be a class III chitinase. While BCLVC acted as a lysozyme at pH 4.5 and low ionic strength (0.03) it acted as a chitinase/chitosanase at high ionic strengths (0.2) with a pH optimum of ca. 5. The lysozyme activity of BCLVC was inhibited by histamine, imidazole, histidine and the N-acetyl-D-glucosamine oligosaccharide (GlcNAc)3. The basic chitinase from cv. Valencia callus, BCVC-2, had an N-terminal amino acid sequence similar to tomato and tobacco AP24 proteins. The sequences of the other five chitinases were N-terminal blocked. Whereas BCLVC was capable of hydrolyzing 13.8-100% acetylated chitosans and (GlcNAc)4-6 oligosaccharides, BCVC-2 hydrolyzed only 100% acetylated chitosan, and the remaining enzymes expressed varying degrees of hydrolytic capabilities. Experiments with (GlcNAc)2-6 suggest that BCLVC hydrolysis occurs in largely tetrasaccharide units whereas hydrolysis by the other chitinases occurs in disaccharide units. Cross-reactivities of the purified proteins with antibodies for a potato leaf chitinase (AbPLC), BCLVC, BCVC-3, and tomato AP24 indicate that these are separate and distinct proteins.

journal_name

Planta

journal_title

Planta

authors

Mayer RT,McCollum TG,Niedz RP,Hearn CJ,McDonald RE,Berdis E,Doostdar H

doi

10.1007/BF00200295

subject

Has Abstract

pub_date

1996-01-01 00:00:00

pages

289-95

issue

3

eissn

0032-0935

issn

1432-2048

journal_volume

200

pub_type

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