ABSTRACT
Kinesins and kinesin-like proteins (KLPs) constitute a large family of microtubule-based motors that play important roles in many fundamental cellular and developmental processes. To date, a number of kinesins or KLPs have been identified in plants including Arabidopsis thaliana. Here, a polyclonal antibody against AtKP1 (kinesin-like protein 1 in A. thaliana) was raised by injection the expressed AtKP1 specific C-terminal polypeptides in rabbits, and immunoblot analysis was conducted with the affinity-purified anti-AtKP1 antibody. The results indicated that this antibody recognized the AtKP1 fusion proteins expressed in E. coli and proteins of ∼125 kDa in the soluble fractions of Arabidopsis extracts. The molecular weight was consistent with the calculated molecular weight based on deduced amino acids sequence of AtKP1. To acquire the subcellular localization of the protein, AtKP1 in Arabidopsis root cells was observed by indirect immunofluorescence microscopy. AtKP1 was localized to particle-like organelles in interphase or dividing cells, but not to mitotic microtubule arrays. Relatively more AtKP1 was found in isolated mitochondria fraction on immunoblot of the subcellular fractions. The AtKP1 protein could not be released following a 0.6 M KI washing, indicating that AtKP1 is tightly bind to mitochondria and might function associated with this kind of organelles.
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Abbreviations
- FITC:
-
(fluorescein isothiocyanate)
- HEPES:
-
[(Na-N-(2-hydroxy-ethyl) piperazine-N′-2-ethanesulfonic acid]
- IPTG:
-
(isopropyl-1-thio-β-D-galactopyranoside)
- PIPES:
-
(piperazine-N′, N-bis 2-ethanesulfonic acid)
- PMSF:
-
(phenylmethylsulfonyl fluoride)
- TAME:
-
(p-tosyl-L-arginine-methyl-ester)
- TRITC:
-
(tetramethylrhodamine isothiocyanate).
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Acknowledgements
We are most grateful to Dr. Gregory S MAY (University of Texas) and Dr. Dong Tao REN (China Agricultural University) for their critical reading. This research was supported by grants from the National Natural Science Foundation of China (Project No. 30421002, 30170457, 30370708) and from the Ministry of Science and Technology of China (Project No. JY03-A-03). We thank Dr. Yi Min LIU for technical assistance with the Confocal Microscopy.
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NI, C., WANG, H., XU, T. et al. AtKP1, a kinesin-like protein, mainly localizes to mitochondria in Arabidopsis thaliana. Cell Res 15, 725–733 (2005). https://doi.org/10.1038/sj.cr.7290342
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DOI: https://doi.org/10.1038/sj.cr.7290342
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