3TS5

Crystal Structure of a Light Chain Domain of Scallop Smooth Muscle Myosin

Summary for 3TS5

• Entry DOI: 10.2210/pdb3ts5/pdb
• Related: 3PN7 3TUY
• Descriptor: Myosin heavy chain, Myosin regulatory light chain, Myosin essential light chain, ... (6 entities in total)
• Functional Keywords: alpha helix, myosin regulation, catch muscle, structural protein
• Biological source: Placopecten magellanicus (Sea scallop); More
• Total number of polymer chains: 6
• Total formula weight: 89492.21

Authors

Kumar, V.S.S.,O'Neall-Hennessey, E.,Reshetnikova, L.,Brown, J.H.,Robinson, H.,Szent-Gyorgyi, A.G.,Cohen, C. (deposition date: 2011-09-12, release date: 2011-11-23, Last modification date: 2024-02-28)

Primary citation

Senthil Kumar, V.S.,O'Neall-Hennessey, E.,Reshetnikova, L.,Brown, J.H.,Robinson, H.,Szent-Gyorgyi, A.G.,Cohen, C.
Crystal structure of a phosphorylated light chain domain of scallop smooth-muscle Myosin.
Biophys.J., 101:2185-2189, 2011

PubMed Abstract: We have determined the crystal structure of a phosphorylated smooth-muscle myosin light chain domain (LCD). This reconstituted LCD is of a sea scallop catch muscle myosin with its phosphorylatable regulatory light chain (RLC SmoA). In the crystal structure, Arg(16), an arginine residue that is present in this isoform but not in vertebrate smooth-muscle RLC, stabilizes the phosphorylation site. This arginine interacts with the carbonyl group of the phosphorylation-site serine in the unphosphorylated LCD (determined previously), and with the phosphate group when the serine is phosphorylated. However, the overall conformation of the LCD is essentially unchanged upon phosphorylation. This result provides additional evidence that phosphorylation of the RLC is unlikely to act as an on-switch in regulation of scallop catch muscle myosin.

PubMed: 22067157
DOI: 10.1016/j.bpj.2011.09.028

Experimental method

X-RAY DIFFRACTION (2.393 Å)