1 Ocak 2021 Dergi makalesi Açık Erişim

Ciftci, Halilibrahim; Tateishi, Hiroshi; Koiwai, Kotaro; Koga, Ryoko; Anraku, Kensaku; Monde, Kazuaki; Dag, Cagdas; Destan, Ebru; Yuksel, Busra; Ayan, Esra; Yildirim, Gunseli; Yigin, Merve; Ertem, F. Betul; Shafiei, Alaleh; Guven, Omur; Besler, Sabri O.; Sierra, Raymond G.; Yoon, Chun Hong; Su, Zhen; Liang, Mengling; Liang, Mengling

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    <subfield code="a">Oligomerization of Pr55(Gag) is a critical step of the late stage of the HIV life cycle. It has been known that the binding of IP6, an abundant endogenous cyclitol molecule at the MA domain, has been linked to the oligomerization of Pr55(Gag). However, the exact binding site of IP6 on MA remains unknown and the structural details of this interaction are missing. Here, we present three high-resolution crystal structures of the MA domain in complex with IP6 molecules to reveal its binding mode. Additionally, extensive Differential Scanning Fluorimetry analysis combined with cryo- and ambient-temperature X-ray crystallography and GNM-based transfer entropy calculations identify the key residues that participate in IP6 binding. Our data provide novel insights about the multilayered HIV-1 virion assembly process that involves the interplay of IP6 with PIP2, a phosphoinositide essential for the binding of Pr55(Gag) to membrane. IP6 and PIP2 have neighboring alternate binding sites within the same highly basic region (residues 18-33). This indicates that IP6 and PIP2 bindings are not mutually exclusive and may play a key role in coordinating virion particles' membrane localization. Based on our three different IP6-MA complex crystal structures, we propose a new model that involves IP6 coordination of the oligomerization of outer MA and inner CA domain's 2D layers during assembly and budding.</subfield>
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