Atomic structure of a tryptophan-zipper pentamer

TY - JOUR

T1 - Atomic structure of a tryptophan-zipper pentamer

AU - Liu, Jie

AU - Yong, Wei

AU - Deng, Yiqun

AU - Kallenbach, Neville R.

AU - Lu, Min

PY - 2004/11/16

Y1 - 2004/11/16

N2 - Coiled-coil motifs are ubiquitous mediators of specific protein-protein interactions through the formation of interlocking hydrophobic seams between α-helical chains. Residues that form these seams occur at the first (a) and fourth (d) positions of a characteristic 7-aa repeat and are primarily aliphatic. The potential of aromatic residues to promote helix association in a coiled coil was explored by engineering a "Trp-zipper" protein with Trp residues at all 14 a and d positions. The protein forms a discrete, stable, α-helical pentamer in water at physiological pH. Its 1.45-Å crystal structure reveals a parallel, five-stranded coiled coil, a previously uncharacterized type of "knobs-into-holes" packing interaction between interfacial Trp side chains, and an unusual ≈8-Å-diameter axial channel lined with indole rings that is filled with polyethylene glycol 400 and water and sulfate ion molecules. The engineered Trp-zipper pentamer enlarges current views of coiled-coil assembly, molecular recognition, and protein engineering, and may serve as a soluble model for membrane ion channels.

AB - Coiled-coil motifs are ubiquitous mediators of specific protein-protein interactions through the formation of interlocking hydrophobic seams between α-helical chains. Residues that form these seams occur at the first (a) and fourth (d) positions of a characteristic 7-aa repeat and are primarily aliphatic. The potential of aromatic residues to promote helix association in a coiled coil was explored by engineering a "Trp-zipper" protein with Trp residues at all 14 a and d positions. The protein forms a discrete, stable, α-helical pentamer in water at physiological pH. Its 1.45-Å crystal structure reveals a parallel, five-stranded coiled coil, a previously uncharacterized type of "knobs-into-holes" packing interaction between interfacial Trp side chains, and an unusual ≈8-Å-diameter axial channel lined with indole rings that is filled with polyethylene glycol 400 and water and sulfate ion molecules. The engineered Trp-zipper pentamer enlarges current views of coiled-coil assembly, molecular recognition, and protein engineering, and may serve as a soluble model for membrane ion channels.

KW - Coiled coils

KW - Protein design

KW - Protein structure

UR - https://www.scopus.com/pages/publications/9244223563

UR - https://www.scopus.com/pages/publications/9244223563#tab=citedBy

U2 - 10.1073/pnas.0405319101

DO - 10.1073/pnas.0405319101

M3 - Article

C2 - 15520380

SN - 0027-8424

VL - 101

SP - 16156

EP - 16161

JO - Proceedings of the National Academy of Sciences of the United States of America

JF - Proceedings of the National Academy of Sciences of the United States of America

IS - 46

ER -