PDBsum entry 3lpw

Structural protein

PDB id

3lpw

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Contents

			Protein chains

					197 a.a. *

			Ligands

					MPD ×2


					MRD

			Waters ×695

* Residue conservation analysis

PDB id:

3lpw

Links

Name:

Structural protein

Title:

Crystal structure of the fniii-tandem a77-a78 from the a-band of titin

Structure:

A77-a78 domain from titin. Chain: a, b. Engineered: yes

Source:

Homo sapiens. Human. Organism_taxid: 9606. Gene: ttn. Expressed in: escherichia coli. Expression_system_taxid: 562.

Resolution:

1.65Å

R-factor:

0.179

R-free:

0.208

Authors:

R.M.Bucher,O.Mayans

Key ref:

R.M.Bucher et al. (2010). The structure of the FnIII Tandem A77-A78 points to a periodically conserved architecture in the myosin-binding region of titin. J Mol Biol, 401, 843-853. PubMed id: 20542041

Date:

06-Feb-10

Release date:

08-Sep-10

PROCHECK

	Headers

	References

Protein chains

Q8WZ42 (TITIN_HUMAN) - Titin from Homo sapiens

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Seq: Struc:					34350 a.a. 197 a.a.*

Key:

PfamA domain

Secondary structure

CATH domain

* PDB and UniProt seqs differ at 3 residue positions (black crosses)



		Enzyme reactions

Enzyme class:

E.C.2.7.11.1 - non-specific serine/threonine protein kinase.

[IntEnz] [ExPASy] [KEGG] [BRENDA]

Reaction:

1.	L-seryl-[protein] + ATP = O-phospho-L-seryl-[protein] + ADP + H⁺
2.	L-threonyl-[protein] + ATP = O-phospho-L-threonyl-[protein] + ADP + H⁺

L-seryl-[protein]	+	ATP	=	O-phospho-L-seryl-[protein]	+	ADP	+	H(+)

L-threonyl-[protein]	+	ATP	=	O-phospho-L-threonyl-[protein]	+	ADP	+	H(+)

Molecule diagrams generated from .mol files obtained from the KEGG ftp site

reference

	J Mol Biol 401:843-853 (2010)
PubMed id: 20542041

The structure of the FnIII Tandem A77-A78 points to a periodically conserved architecture in the myosin-binding region of titin.
R.M.Bucher, D.I.Svergun, C.Muhle-Goll, O.Mayans.

ABSTRACT

Titin is a large intrasarcomeric protein that, among its many roles in muscle, is thought to modulate the in vivo assembly of the myosin motor filament. This is achieved through the molecular template properties of its A-band region, which is composed of fibronectin type III (FnIII) and immunoglobulin (Ig) domains organized into characteristic seven- (D-zone) and eleven- (C-zone) domain super-repeats. Currently, little knowledge exists of the structural details of this region of titin. Here we report the conformational characterization of three FnIII-tandems - A77-A78, A80-A82 and A84-A86 - components of the representative fourth C-zone super-repeat. The structure of A77-A78 has been elucidated by X-ray crystallography to 1.65 A resolution, while low resolution models of A80-A82 and A84-A86 have been calculated using SAXS. A77-A78 adopts an extended "up-down" domain arrangement, where domains are connected by a hydrophilic three-residue linker sequence. The linker is embedded into a rich network of polar contacts at the domain interface that results in a stiff molecular conformation. The models of A80-A82 and A84-A86, which contain hydrophobic six-residue long interdomain linkers, equally showed elongated molecular shapes but with slightly coiled or zig-zagged conformations. SAXS data further suggested that the long linkers do not result in a noticeable increase of molecular flexibility but that lead to semi-bent domain arrangements. Our findings indicate that the structural characteristics of FnIII-tandems from A-band titin contrast markedly with those of poly-Ig tandems from the elastic I-band, which exhibit domain interfaces depleted of interactions and compliant conformations. Further, the analysis of sequence conservation in FnIII domains from A-band titin points to the existence of conformationally defined interfaces at specific superrepeat positions, possibly leading to a periodical and locally ordered architecture supporting the molecular scaffold properties of this region of titin.

Literature references that cite this PDB file's key reference

PubMed id

Reference

21332356

J.Hsin, J.Strümpfer, E.H.Lee, and K.Schulten (2011).
Molecular origin of the hierarchical elasticity of titin: simulation, experiment, and theory.

Annu Rev Biophys, 40, 187-203.

The most recent references are shown first. Citation data come partly from CiteXplore and partly from an automated harvesting procedure. Note that this is likely to be only a partial list as not all journals are covered by either method. However, we are continually building up the citation data so more and more references will be included with time.