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User:HPatel

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CACAO Phage Hunters 2018

My Annotations

StatusPageDate/TimeGO Term (Aspect)ReferenceEvidenceNotesLinks
acceptableBPSPP:TUBE2018-04-01 08:43:41 CDTGO:0098005 viral head-tail joining (P)PMID:24443902ECO:0000314 direct assay evidence used in manual assertion

An in-vitro complementation assay was used to study incorporation of gp17 during assembly of viral particles. Each extract was separately mixed with 4 different components; water, complete tails purified from SPP1sus31 with gp17, tails without gp17 purified from SPP1sus82, and purified gp17. After incubation, the titer of the progeny was calculated in Figure 7. The expected result was sus31 tails in both extracts allowed it to join to the capsids for virion assembly. When mixing SPP1sus82 tails without gp17 with SPP1sus45, virion particles assembled, suggesting endogenous gp17 was able to join head and tail. SPP1sus82 had a low titer, thus tails weren’t able to attach. Finally, purified gp17 mixed SPP1sus82 extracts was sufficient for tail to head stickage. This assay shows that gp17 is involved in binding to the tail and later attaching to the DNA-filled capsid.

challenge
acceptableBPT4:SEGB2018-04-12 15:47:35 CDTGO:0004520 endodeoxyribonuclease activity (F)PMID:18281701ECO:0000314 direct assay evidence used in manual assertion

The T4 SegB protein is a site-specific endonuclease that recognizes a 27-bp sequence. 666 bp segB ORF was placed under the control of T7 promoter in pET-15b vector. SegB protein was overproduced in E. coli T7 lac promoter system and purified. The purified protein was incubated with a linear plasmid DNA and products were analyzed of the reaction through gel electrophoresis (Figure 3). SegB cleaved DNA by introducing double-strand breaks in reactions requiring Mg2+, Mn2+, or Ca2+ cations. With Mg2+ and Ca2+ cation, SegB cleaved the DNA at 1 point, creating 2.2 kb and 1.6 kb fragments. In the presence of Mn2+, multiple cleavage sites were present.

challenge

acceptable:2
unacceptable:0
requires_changes:0
flagged:0

Annotations challenged by HPatel

StatusAuthor,GroupPageGO Term (Aspect)ReferenceEvidenceLinksPage history
acceptableRPatel,
Team Green B 2018
ENTFA:Q837U3GO:0070051 - fibrinogen binding (F)PMID:29487730ECO:0000021 physical interaction evidencechallengeC: 1
acceptableHPaudel,
Team Green B 2018
BPT5:TMPGO:0061783 - peptidoglycan muralytic activity (F)PMID:18348984ECO:0000314 direct assay evidence used in manual assertionchallengeC: 3

0 annotations fixed by HPatel

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