Identification of non-specific lipid transfer protein-1 as a calmodulin-binding protein in Arabidopsis.
Although non-specific lipid transfer proteins (nsLTPs) are widely present in plants, their functions and regulations have not been fully understood. In this report, Arabidopsis nsLTP1 was cloned and expressed to investigate its binding to calmodulin (CaM). Gel overlay assays revealed that recombinant nsLTP1 bound to CaM in a calcium-independent manner. The association of nsLTP1 and CaM was corroborated using CaM-Sepharose beads to specifically isolate recombinant nsLTP1 from crude bacterial lysate. The CaM-binding site was mapped in nsLTP1 to the region of 69-80 amino acids. This region is highly conserved among plant nsLTPs, implicating that nsLTPs are a new family of CaM-binding proteins whose functions may be mediated by CaM signaling.
Wang
Zhe
Z
Department of Biochemistry and Molecular Biology, Nankai University, Tianjin 300071, PR China.
Xie
Wanqin
W
Chi
Fang
F
Li
Cuifeng
C
D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D001483:Base Sequence; D001665:Binding Sites / Q000235:genetics; D002147:Calmodulin / Q000378:metabolism; D002148:Calmodulin-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D003001:Cloning, Molecular; D008969:Molecular Sequence Data; D009154:Mutation / Q000235:genetics; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism
D029681:Arabidopsis Proteins; D002147:Calmodulin; D002148:Calmodulin-Binding Proteins; D011994:Recombinant Proteins; C499861:non-specific lipid transfer protein-1, Arabidopsis