Research Progress on Plant ABCB Transporter

doi:10.13560/j.cnki.biotech.bull.1985.2019-0899

Abstract

Abstract: ABC transporter family is a transport protein that binds and hydrolyzes ATP to release energy to realize the transmembrane transport of substrates.They are involved in many physiological and metabolic processes in plants.The ABC transporter family is divided into 8 subgroups according to the evolutionary relationship of conserved regions,among which ABCB transporter is the second largest subgroup.The conserved NBDs domain of ABCB transporter and the hydrophobic transmembrane domain of 6 transmembrane alpha-helices form the TMDs domain,thus the solute transmembrane channel is formed,while its structure,length and sequence vary. Plant ABCB transporters can be divided into whole molecule transporters and half molecule transporters. Through sequencing,ABCB transporter is found in arabidopsis thaliana,rice,tomato and other plants,and performs various functions. Studies have shown that ABCB transporter gene mediates the transport of heavy metal ions such as cadmium,lead and aluminum,and increases the tolerance of heavy metal in plants. It is directly involved in the transport of auxin in plants,thus regulating plant height. It may also transport malic acid from plasmids to guard cells to regulate stomatal opening and closing.In recent years,more and more ABCB transporters have been identified,but the ABCB subfamily is large,the substrate specificity is strong,the transport mechanism is complex,and the functions of most transporters have not been determined.Therefore,to understand the importance of ABCB transporter in the process of life activities and the mechanism of gene expression and regulation,and to analyze the important role of ABCB transporter in the process of responding to adversity and stress,may provide ideas for plant stress resistance breeding.

Key words: ABCB transport protein, structure, function

WANG Xuan, CHEN Hai-xia. Research Progress on Plant ABCB Transporter[J]. Biotechnology Bulletin, 2020, 36(6): 223-229.

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