Structural transitions during bacteriophage HK97 head assembly
Structural transitions during bacteriophage HK97 head assembly Duda, Robert L.; Hempel, John; Michel, Hanspeter; Shabanowitz, Jeffrey; Hunt, Donald; Hendrix, Roger W. 1995-04-07 00:00:00 Bacteriophage HK97 builds its head shell from a 42 kDa major head protein, but neither this 42 kDa protein nor its processed, 31 kDa form is found in the mature head. Instead, each of the major head-protein subunits is covalently cross-linked into oligomers of five, six or more by a protein cross-linking reaction that occurs both in vivo and in vitro . Mutants that block prohead maturation lead to the accumulation of one of two types of proheads, termed Prohead I and Prohead II. Prohead I is assembled from about 415 copies of the 42 kDa (384 amino acids) protein subunit and accumulates in infections by mutant am U4. Following assembly, the N-terminal 102 amino acids of each subunit are removed, leaving a prohead shell constructed of 31 kDa subunits, called Prohead II, which accumulates in infections by mutant am C2. During DNA packaging, when the prohead shell expands, all of the head protein subunits become covalently cross-linked to other subunits. Purified Prohead II (or, less completely, Prohead I) becomes cross-linked in vitro in response to any of a number of conditions that induce shell expansion, including conditions commonly used for protein analysis. In vitro cross-linking occurs efficiently in the absence of added cofactors of enzymes, and we propose that cross-linking is catalyzed by shell subunits themselves. Shell expansion is easily monitored by observing a decrease in electrophoretic mobility of Prohead II in agarose gels. Using the mobility shift in agarose gel to monitor expansion and SDS/gel electrophoresis to monitor cross-linking in vitro , we find that expansion precedes and is required for cross-linking, and we propose that expansion triggers the cross-linking reaction. Comparison of peptides isolated from Prohead II and in vitro cross-linked Prohead II shows a single altered major cross-link peptide in which a lysine, originating from lysine169 of the protein sequence, is linked to asparagine356, presumably derived from the neighboring subunit. Examination of the cross-link-containing peptide by mass spectrometry shows that the cross-link bond is an amide between the side-chains of the lysine and the asparagine residues. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Molecular Biology Elsevier http://www.deepdyve.com/lp/elsevier/structural-transitions-during-bacteriophage-hk97-head-assembly-20070KR9B6
Duda, Robert L.; Hempel, John; Michel, Hanspeter; Shabanowitz, Jeffrey; Hunt, Donald; Hendrix, Roger W.
Journal of Molecular Biology
, Volume 247 (4) – Apr 7, 1995
/lp/elsevier/structural-transitions-during-bacteriophage-hk97-head-assembly-20070KR9B6
Journal of Molecular Biology /
Biochemistry, Genetics and Molecular Biology /
Copyright © 1995 Academic Press Limited
Bacteriophage HK97 builds its head shell from a 42 kDa major head protein, but neither this 42 kDa protein nor its processed, 31 kDa form is found in the mature head. Instead, each of the major head-protein subunits is covalently cross-linked into oligomers of five, six or more by a protein cross-linking reaction that occurs both in vivo and in vitro . Mutants that block prohead maturation lead to the accumulation of one of two types of proheads, termed Prohead I and Prohead II. Prohead I is assembled from about 415 copies of the 42 kDa (384 amino acids) protein subunit and accumulates in infections by mutant am U4. Following assembly, the N-terminal 102 amino acids of each subunit are removed, leaving a prohead shell constructed of 31 kDa subunits, called Prohead II, which accumulates in infections by mutant am C2. During DNA packaging, when the prohead shell expands, all of the head protein subunits become covalently cross-linked to other subunits. Purified Prohead II (or, less completely, Prohead I) becomes cross-linked in vitro in response to any of a number of conditions that induce shell expansion, including conditions commonly used for protein analysis. In vitro cross-linking occurs efficiently in the absence of added cofactors of enzymes, and we propose that cross-linking is catalyzed by shell subunits themselves. Shell expansion is easily monitored by observing a decrease in electrophoretic mobility of Prohead II in agarose gels. Using the mobility shift in agarose gel to monitor expansion and SDS/gel electrophoresis to monitor cross-linking in vitro , we find that expansion precedes and is required for cross-linking, and we propose that expansion triggers the cross-linking reaction. Comparison of peptides isolated from Prohead II and in vitro cross-linked Prohead II shows a single altered major cross-link peptide in which a lysine, originating from lysine169 of the protein sequence, is linked to asparagine356, presumably derived from the neighboring subunit. Examination of the cross-link-containing peptide by mass spectrometry shows that the cross-link bond is an amide between the side-chains of the lysine and the asparagine residues.
Journal of Molecular Biology – Elsevier
Published: Apr 7, 1995
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Duda, R., Hempel, J., Michel, H., Shabanowitz, J., Hunt, D., & Hendrix, R. (1995). Structural transitions during bacteriophage HK97 head assembly. Journal of Molecular Biology, 247(4), 618-635.
Duda, Robert L., John Hempel, Hanspeter Michel, Jeffrey Shabanowitz, Donald Hunt, and Roger W. Hendrix. "Structural transitions during bacteriophage HK97 head assembly." Journal of Molecular Biology 247.4 (1995): 618-635.