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. 1983;2(11):1921–1927. doi: 10.1002/j.1460-2075.1983.tb01680.x

Biochemical and genetical characterization of a fiber-defective temperature-sensitive mutant of type 2 adenovirus.

M L Boudin, M Rigolet, P Lemay, F Galibert, P Boulanger
PMCID: PMC555389  PMID: 6571701

Abstract

The adenovirus type 2 fiber mutant H2 ts 125 synthesized an unstable, temperature-sensitive fiber polypeptide with an apparent mol. wt. smaller by 2500 than the wild-type (62 K). The polypeptide of 59.5 K was found to be stable at the permissive temperature (33 degrees C). H2 ts 125 fiber synthesized in reticulocyte lysates had the same apparent mol. wt. of 59.5 K as the mutant fiber produced in vivo. Neither structural nor functional differences between wild-type and mutant fibers were detected in the N-terminal and C-terminal sequences, excluding the occurrence of a new initiation or termination codon. Restriction analysis of H2 ts 125 DNA also ruled out the hypothesis of a deletion mutant. The 59.5 K mutant fiber unit was normally glycosyated, N-acetylated, assembled into 6S oligomeric fiber and incorporated into virions. DNA sequencing of the H2 ts 125 fiber gene revealed two point mutations at nucleotides 3970 (C*TT leads to T*TT) and 4958 (GC*T leads to GT*T), corresponding to two amino acid changes at positions 105 and 434, respectively. The 105 mutation consisted of a conservative change Leu leads to Phe; the 434 interchange was Ala leads to Val, usually considered as nonconservative. The possibility of a donor site for splicing created by the mutation at codon GTT was eliminated on the basis of S1 nuclease analysis data. All these results suggested that either one or both mutations concerned highly organized domain(s) of the fiber polypeptide chain, resulting in aberrant mobility in SDS-polyacrylamide gels and temperature-sensitivity.

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