Proteopedia

2lnm

Solution structure of the C-terminal NP-repeat domain of Tic40, a co-chaperone during protein import into chloroplastsSolution structure of the C-terminal NP-repeat domain of Tic40, a co-chaperone during protein import into chloroplasts

Structural highlights

2lnm is a 1 chain structure with sequence from Arabidopsis thaliana. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:Solution NMR
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

TIC40_ARATH Involved in protein precursor import into chloroplasts. Part of the motor complex consisting of a co-chaperone (TIC40) and a chaperone (HSP93) associated with the import channel (TIC110). Causes the release of bound transit peptides from TIC110 and stimulates ATP hydrolysis by HSP93. Involved in reinsertion of proteins from the chloroplast stroma into the inner membrane.[1] [2] [3] [4] [5] [6]

Publication Abstract from PubMed

Chloroplasts protein precursors translated in the cytosol traverse the membranes to reach their intended destination with the help of translocon complexes called translocon at the outer envelope of chloroplasts and translocon at the inner envelope of chloroplasts (TIC), respectively. Two components of the TIC translocon, Tic110 and Tic40, which combine with Hsp93 (ClpC), are involved in protein translocation across the inner membrane into the stroma. The C-terminal NP-repeat domain of Tic40 (Tic40-NP) is homologous to the DP-repeat domain of co-chaperones Hsp70-interacting and Hsp70/Hsp90-organizing proteins. Interaction of Tic40-NP and Hsp93 stimulates ATP hydrolysis of Hsp93, but the hydrolysis is abolished in both N320A and N329A mutants of Tic40-NP. Here, we determined the nuclear magnetic resonance structure of Tic40-NP, which mainly consists of five alpha-helices stabilized by two hydrophobic cores. In addition, chemical shift perturbation results suggested that some residues at alpha1 and alpha5, as well as residues Asn320 and Asn329, cause conformational change on the two mutants, which may subsequently affect their binding to Hsp93. We provide valuable information for further investigating how Tic40-NP interacts with Hsp93.

Solution structure of the C-terminal NP-repeat domain of Tic40, a co-chaperone during protein import into chloroplasts.,Kao YF, Lou YC, Yeh YH, Hsiao CD, Chen C J Biochem. 2012 Nov;152(5):443-51. doi: 10.1093/jb/mvs086. Epub 2012 Aug 10. PMID:22888115[7]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

See Also

References

  1. ↑ Chou ML, Fitzpatrick LM, Tu SL, Budziszewski G, Potter-Lewis S, Akita M, Levin JZ, Keegstra K, Li HM. Tic40, a membrane-anchored co-chaperone homolog in the chloroplast protein translocon. EMBO J. 2003 Jun 16;22(12):2970-80. PMID:12805212 doi:http://dx.doi.org/10.1093/emboj/cdg281
  2. ↑ Inaba T, Alvarez-Huerta M, Li M, Bauer J, Ewers C, Kessler F, Schnell DJ. Arabidopsis tic110 is essential for the assembly and function of the protein import machinery of plastids. Plant Cell. 2005 May;17(5):1482-96. Epub 2005 Apr 13. PMID:15829604 doi:http://dx.doi.org/10.1105/tpc.105.030700
  3. ↑ Kovacheva S, Bedard J, Patel R, Dudley P, Twell D, Rios G, Koncz C, Jarvis P. In vivo studies on the roles of Tic110, Tic40 and Hsp93 during chloroplast protein import. Plant J. 2005 Feb;41(3):412-28. PMID:15659100 doi:http://dx.doi.org/10.1111/j.1365-313X.2004.02307.x
  4. ↑ Chou ML, Chu CC, Chen LJ, Akita M, Li HM. Stimulation of transit-peptide release and ATP hydrolysis by a cochaperone during protein import into chloroplasts. J Cell Biol. 2006 Dec 18;175(6):893-900. Epub 2006 Dec 11. PMID:17158958 doi:http://dx.doi.org/10.1083/jcb.200609172
  5. ↑ Bedard J, Kubis S, Bimanadham S, Jarvis P. Functional similarity between the chloroplast translocon component, Tic40, and the human co-chaperone, Hsp70-interacting protein (Hip). J Biol Chem. 2007 Jul 20;282(29):21404-14. Epub 2007 May 29. PMID:17535810 doi:http://dx.doi.org/10.1074/jbc.M611545200
  6. ↑ Chiu CC, Li HM. Tic40 is important for reinsertion of proteins from the chloroplast stroma into the inner membrane. Plant J. 2008 Dec;56(5):793-801. doi: 10.1111/j.1365-313X.2008.03638.x. Epub 2008, Jul 23. PMID:18657235 doi:http://dx.doi.org/10.1111/j.1365-313X.2008.03638.x
  7. ↑ Kao YF, Lou YC, Yeh YH, Hsiao CD, Chen C. Solution structure of the C-terminal NP-repeat domain of Tic40, a co-chaperone during protein import into chloroplasts. J Biochem. 2012 Nov;152(5):443-51. doi: 10.1093/jb/mvs086. Epub 2012 Aug 10. PMID:22888115 doi:http://dx.doi.org/10.1093/jb/mvs086
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