2pq3 Summary

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N-Terminal Calmodulin Zn-Trapped Intermediate

The structure was published by Warren, J.T., Guo, Q., and Tang, W.J., in 2007 in a paper entitled "A 1.3-A structure of zinc-bound N-terminal domain of calmodulin elucidates potential early ion-binding step." (abstract).

This crystal structure was determined using X-ray diffraction at a resolution of 1.3 Å and deposited in 2007.

The experimental data on which the structure is based was also deposited.

The PDB entry contains the structure of Calmodulin. This molecule has the UniProt identifier P62161 (CALM_RAT)search. The sample contained 76 residues which is < 90% of the natural sequence. Out of 76 residues 73 were observed and are deposited in the PDB.

It also contains one or more heterogenic compounds (e.g., ligands, co-factors, ions, modified amino acids, etc.); see here for a complete list.

The molecule has more than one probable quaternary state observed. For more details see the quaternary structure page.

The following tables show cross-reference information to other databases (to obtain a list of all PDB entries sharing the same property or classification, click on the magnifying glass icon):


Chain Name UniProt Name of source organism % of UniProt sequence present in the sample Residues in the sample molecules % of residues observed
A Calmodulin P62161 (2-77) (CALM_RAT)search Rattus norvegicussearch 98% 76 97%


This entry contains 1 unique UniProt protein:

UniProt accession Name Organism PDB
P62161 (2 - 77) Calmodulin Rattus norvegicus

Chain Structural classification (SCOP) Sequence family (Pfam)
A (P62161) Calmodulin-likesearch PF13499: EF-hand domain pairsearch, PF13833: EF-hand domain pairsearch

Chain ID Molecular function (GO)
A (P62161) calcium ion bindingsearch

Chain InterPro annotation
A EF-hand domainsearch EF-hand domain pairsearch EF-Hand 1, calcium-binding sitesearch