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5ZVJ

Crystal structure of HtrA1 from Mycobacterium tuberculosis

Replaces:  5XDY
Summary for 5ZVJ
Entry DOI10.2210/pdb5zvj/pdb
DescriptorSerine protease, 2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL (3 entities in total)
Functional Keywordshtra, mycobacterium, pdz, protease, hydrolase
Biological sourceMycobacterium tuberculosis
Total number of polymer chains1
Total formula weight34988.05
Authors
Khundrakpam, H.S.,Yadav, S.,Kumar, D.,Biswal, B.K. (deposition date: 2018-05-10, release date: 2018-09-05, Last modification date: 2024-11-13)
Primary citationSingh, K.H.,Yadav, S.,Kumar, D.,Biswal, B.K.
The crystal structure of an essential high-temperature requirement protein HtrA1 (Rv1223) from Mycobacterium tuberculosis reveals its unique features.
Acta Crystallogr D Struct Biol, 74:906-921, 2018
Cited by
PubMed Abstract: High-temperature requirement A (HtrA) proteins, which are members of the heat-shock-induced serine protease family, are involved in extracytoplasmic protein quality control and bacterial survival strategies under stress conditions, and are associated with the virulence of several pathogens; they are therefore major drug targets. Mycobacterium tuberculosis possesses three putative HtrAs: HtrA1 (Rv1223), HtrA2 (Rv0983) and HtrA3 (Rv0125). Each has a cytoplasmic region, a transmembrane helix and a periplasmic region. Here, the crystal structure of the periplasmic region consisting of a protease domain (PD) and a PDZ domain from an M. tuberculosis HtrA1 mutant (mHtrA1) is reported at 2.7 Å resolution. Although the mHtrA1 PD shows structural features similar to those of other HtrAs, its loops, particularly L3 and LA, display different conformations. Loop L3 communicates between the PDs of the trimer and the PDZ domains and undergoes a transition from an active to an inactive conformation, as reported for an equivalent HtrA (DegS). Loop LA, which is responsible for higher oligomer formation owing to its length (50 amino acids) in DegP, is very short in mHtrA1 (five amino acids), as in mHtrA2 (also five amino acids), and therefore lacks essential interactions for the formation of higher oligomers. Notably, a well ordered loop known as the insertion clamp in the PDZ domain interacts with the protease domain of the adjacent molecule, which possibly aids in the stabilization of a trimeric functional unit of this enzyme. The three-dimensional structure of mHtrA1 presented here will be useful in the design of enzyme-specific antituberculosis inhibitors.
PubMed: 30198900
DOI: 10.1107/S205979831800952X
PDB entries with the same primary citation
Experimental method
X-RAY DIFFRACTION (2.7 Å)
Structure validation

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