Serine/threonine-protein kinase StkP - Q8DNS0 (STKP_STRR6)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for Q8DNS0: 1
Protein kinase involved in signal transduction pathways that regulate various cellular processes. Likely senses intracellular peptidoglycan subunits present in the cell division septa of actively growing cells; thus, intracellular unlinked peptidoglycan may serve as the signal molecules that trigger StkP phosphorylation activity on a set of substrates. Plays a crucial role in the regulation of cell shape and cell division of S.pneumoniae through control of at least DivIVA activity. Identified target substrates that are specifically phosphorylated by StkP in vivo, mainly on threonine residues, are DivIVA and StkP itself. Autophosphorylated StkP is a substrate for the cotranscribed protein phosphatase PhpP (shown in the avirulent strain Rx / Cp1015); PhpP and StkP appear to constitute a functional signaling couple in vivo. UniProt
Pathway Maps
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Subunit Structure
Homodimer. StkP forms dimers through its transmembrane and extracellular domains. Dimer formation likely promotes autophosphorylation activity and might be necessary for targeting StkP substrate. UniProt
Consists of an N-terminal kinase domain, a transmembrane domain, and a C-terminal domain containing four repeats of the PASTA signature sequence (Penicillin-binding protein and Ser/Thr protein kinase associated domain). The PASTA domain binds to peptidoglycan (PGN) subunits (shown in strain Rx / Cp1015), is essential for StkP activation and substrate phosphorylation, and is required for cellular targeting to midcell. UniProt
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