6BJF
NMR Structural and biophysical functional analysis of intracellular loop 5 of the NHE1 isoform of the Na+/H+ exchanger.
6BJF の概要
| エントリーDOI | 10.2210/pdb6bjf/pdb |
| NMR情報 | BMRB: 30371 |
| 分子名称 | GLY-LEU-THR-TRP-PHE-ILE-ASN-LYS-PHE-ARG-ILE-VAL-LYS (1 entity in total) |
| 機能のキーワード | structure from cyana 2.1, membrane protein |
| 由来する生物種 | Homo sapiens |
| タンパク質・核酸の鎖数 | 1 |
| 化学式量合計 | 1624.99 |
| 構造登録者 | |
| 主引用文献 | Wong, K.Y.,McKay, R.,Liu, Y.,Towle, K.,Elloumi, Y.,Li, X.,Quan, S.,Dutta, D.,Sykes, B.D.,Fliegel, L. Diverse residues of intracellular loop 5 of the Na+/H+exchanger modulate proton sensing, expression, activity and targeting. Biochim Biophys Acta Biomembr, 1861:191-200, 2019 Cited by PubMed Abstract: The mammalian Na/H exchanger isoform 1 (NHE1) is an integral membrane protein that regulates intracellular pH (pH) by removing a single intracellular proton in exchange for one extracellular sodium ion. It is involved in cardiac hypertrophy and ischemia reperfusion damage to the heart and elevation of its activity is a trigger for breast cancer metastasis. NHE1 has an extensive 500 amino acid N-terminal membrane domain that mediates transport and consists of 12 transmembrane segments connected by intracellular and extracellular loops. Intracellular loops are hypothesized to modulate the sensitivity to pH. In this study, we characterized the structure and function of intracellular loop 5 (IL5), specifically amino acids 431-443. Mutation of eleven residues to alanine caused partial or nearly complete inhibition of transport; notably, mutation of residues L432, T433, I436, N437, R440 and K443 demonstrated these residues had critical roles in NHE1 function independent of effects on targeting or expression. The nuclear magnetic resonance (NMR) solution spectra of the IL5 peptide in a membrane mimetic sodium dodecyl sulfate solution revealed that IL5 has a stable three-dimensional structure with substantial alpha helical character. NMR chemical shifts indicated that K438 was in close proximity with W434. Overall, our results show that IL5 is a critical, intracellular loop with a propensity to form an alpha helix, and many residues of this intracellular loop are critical to proton sensing and ion transport. PubMed: 30071192DOI: 10.1016/j.bbamem.2018.07.014 主引用文献が同じPDBエントリー |
| 実験手法 | SOLUTION NMR |
構造検証レポート
検証レポート(詳細版)
をダウンロード
をダウンロード
