Cloning, purification, and polymerization of Capsicum annuum recombinant alpha and beta tubulin

Biosci Biotechnol Biochem. 2008 Apr;72(4):1048-55. doi: 10.1271/bbb.70794. Epub 2008 Apr 7.

Abstract

Alpha and beta tubulin genes were cloned from the Capsicum annuum leaves using rapid amplification of cDNA ends (RACE)-PCR. Nucleotide sequence analysis revealed that 1,353 bp Capsicum annuum alpha/beta-tubulin (CAnm alpha/beta-TUB) encodes a protein of 450 amino acids (aa) each. The recombinant alpha/beta tubulin was overexpressed mainly as an inclusion body in Escherichia coli BL21 (DE3), upon induction with 0.2 mM isopropyl-beta-D-thiogalactopyranoside (IPTG), and its content was as high as 50% of the total protein content. Effective fusion protein purification and refolding are described. The average yields of alpha and beta tubulin were 2.0 and 1.3 mg/l of culture respectively. The apparent molecular weight of each tubulin was estimated to be 55 kDa by SDS-polyacrylamide gel electrophoresis (PAGE). The tubulin monomers were found to be assembly competent using a standard dimerization assay, and also retained antigenicity with anti-His/T7 antibodies. The purified tubulins were polymerized to microtubule-like structures in the presence of 2 mM guanosine 5'-triphosphate (GTP).

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Biopolymers / chemistry
  • Biopolymers / genetics
  • Biopolymers / isolation & purification
  • Biopolymers / metabolism
  • Capsicum / genetics*
  • Capsicum / metabolism*
  • Cloning, Molecular
  • Conserved Sequence
  • Dimerization
  • Gene Expression Regulation, Plant
  • Molecular Sequence Data
  • Protein Binding
  • Protein Structure, Quaternary
  • Recombinant Proteins / chemistry
  • Recombinant Proteins / genetics*
  • Recombinant Proteins / isolation & purification
  • Recombinant Proteins / metabolism*
  • Sequence Alignment
  • Sequence Analysis, Protein
  • Sequence Homology, Amino Acid
  • Tubulin / chemistry
  • Tubulin / genetics*
  • Tubulin / isolation & purification
  • Tubulin / metabolism*

Substances

  • Biopolymers
  • Recombinant Proteins
  • Tubulin

Associated data

  • GENBANK/EF495257
  • GENBANK/EF495259