Idenpngication of Functional Residues in Maltose Transporter with the Elastic Network Model†

doi:10.7503/cjcu20131185

Abstract

Abstract:

Maltose transporter is an important kind of transmembrane transporters with significant biological functions which bears the transportation of intracellular and extracellular maltose molecules. The transport process of maltose molecule accompanies with large scale cooperative motions between different domains of maltose transporter. And these motions involve some key residues that mediate signal transduction and allosteric effects between different regions of the protein. In this study, we idenpngied the key residues in this protein system with the thermodynamic method based on the elastic network model which was developed by our group. On this basis, we explored the long-range synergies within the maltose transporter. These results are helpful to a better understanding the molecular mechanisms of function of transporters.

Key words: Maltose transporter, Elastic network model, Thermodynamic cycle, Allosteric effect, Functional residue

CLC Number:

O641

TrendMD:

ZHOU Xiaofeng, XIE Xiaolu, ZHANG Lei, LI Chunhua, LOU Jiaoying, LIU Naibo, DING Zhenshan. Idenpngication of Functional Residues in Maltose Transporter with the Elastic Network Model^†[J]. Chem. J. Chinese Universities, 2014, 35(6): 1311.

Figures/Tables 5

Fig.1 Crystal structure of MalFGK2(A) The “inward-facing” conformation; (B) the “outward-facing” conformation.

Fig.2 Diagram of thermodynamic cycle

Fig.3 ΔΔG value response to each residue perturbationThe key residue clusters are marked by the numbers of 1—23.

Fig.4 Mean-square fluctuation of residues in MalFGK2 structureThe key residue clusters are marked by circles and the numbers of 1—23.

Fig.5 Key residues mapped onto the protein structureThe ball represents the location of the central residue of each residue cluster. The cluster number is the same as that in Fig.3.

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