1TUL

STRUCTURE OF TLP20

1TUL の概要

• エントリーDOI: 10.2210/pdb1tul/pdb
• 分子名称: TLP20 (2 entities in total)
• 機能のキーワード: telokin-like protein
• 由来する生物種: Autographa californica nucleopolyhedrovirus
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 12179.95

構造登録者

Rayment, I.,Holden, H.M. (登録日: 1996-08-17, 公開日: 1997-02-17, 最終更新日: 2024-02-14)

主引用文献

Holden, H.M.,Wesenberg, G.,Raynes, D.A.,Hartshorne, D.J.,Guerriero, V.,Rayment, I.
Molecular structure of a proteolytic fragment of TLP20.
Acta Crystallogr.,Sect.D, 52:1153-1160, 1996

PubMed Abstract: Myosin light-chain kinase is responsible for the phosphorylation of myosin in smooth muscle cells. In some tissue types, the C-terminal portion of this large enzyme is expressed as an independent protein and has been given the name telokin. Recently, an antibody directed against telokin was found to interact with a protein derived from the baculovirus Autographa californica nuclear polyhedrosis virus. This protein was biochemically characterized and given the name TLP20 for telokin-like protein of 20 000 molecular weight. The amino-acid sequence of TLP20 was determined on the basis of a cDNA clone and subsequent alignment searches failed to reveal any homology to telokin or to other known proteins. The three-dimensional structure of a proteolytic portion of TLP20 is reported here. Crystals employed in the investigation were grown from ammonium sulfate solutions at pH 6.0 and belonged to the space group P2(1)3 with unit-cell dimensions of a = b = c = 76.3 A and one molecule per asymmetric unit. The structure was determined by multiple isomorphous replacement with three heavy-atom derivatives. Least-squares refinement of the model reduced the crystallographic R factor to 18.1% for all measured X-ray data from 30.0 to 2.2 A. The overall fold of the molecule may be described as a seven-stranded antiparallel beta-barrel flanked on the bottom by two additional beta-strands and on the top by an alpha-helix. Quite surprisingly, the three-dimensional structure of this beta-barrel is not similar to telokin or to any other known protein.

PubMed: 15299576
DOI: 10.1107/S0907444996008128

実験手法

X-RAY DIFFRACTION (2.2 Å)