PROTEIN TRAFFICKING AND LOCALIZATION PROTEINS SYNTHESIZED IN CYTOPLASM, BUT BECOME LOCALIZED IN CYTOPLASM CYTOPLASMIC MEMBRANE PERIPLASM OUTER MEMBRANE.

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PROTEIN TRAFFICKING AND LOCALIZATION PROTEINS SYNTHESIZED IN CYTOPLASM, BUT BECOME LOCALIZED IN CYTOPLASM CYTOPLASMIC MEMBRANE PERIPLASM OUTER MEMBRANE RELEASED IN ENVIRONMENT HOW? WHAT IS MECHANISM(S) OF LOCALIZATION?

INSERTION OF INTEGRAL CYTOPLASMIC MEMBRANE PROTEINS – AN EXAMPLE CYTOPLASMIC MEMBRANE PROTEINS CONTAIN “SIGNAL SEQUENCE” HYDROPHOBIC AMINO ACID RESIDUES NEAR THE N-TERMINUS [e.g., GLYCINE, ALANINE, VALINE, LEUCINE, PHENYLALANINE] SIGNAL SEQUENCE ALLOWS PROTEIN TO BIND MEMBRANE AND BE SOLUBLE IN THE PHOSPHOLIPID MATRIX. AND TRANS-MEMBRANE-SPANNING SEQUENCES - HYDROPHOBIC SIGNAL RECOGNITION PARTICLE SRP BINDS NASCENT PROTEIN (BEING TRANSLATED) AND DELIVERS TO MEMBRANE BOUND RECEPTOR RECEPTOR PROTEIN DELIVERS NASCENT MEMBRANE PROTEIN TO TRANSLOCON TRANSLOCON INSERTS NASCENT MEMBRANE PROTEIN INTO CYTOPLASMIC MEMBRANE WITH MEMBRANE-SPANNING REGIONS TRAVERSING MEMBRANE

NASCENT INTEGRAL MEMBRANE PROTEIN RIBOSOME mRNA CYTOPLASMIC MEMBRANE RECEPTOR 1 PROTEIN SYNTHESIS STARTS ON RIBOSOME [N-TERMINUS SYNTHESIZED FIRST] 2 SRP BINDS SIGNAL AND TRANSPORTS TO RECEPTOR 3 RECEPTOR FACILITATES NASCENT PROTEIN BINDING TO TRANSLOCON 4 TRANSLOCON FACILITATES INSERTION INTO CYTOPLASMIC MEMBRANE (SIGNAL & MEMBRANE-SPANNING) PERIPLASM SRP TRANSLOCON MEMBRANE SPANNING SIGNAL SEQUENCE

NADH DEHYDROGENASE CYTOPLASM CM MEMBRANE SPANNING SEQUENCES APPRECIATE!!

PROTEIN EXPORT INTO PERIPLASMIC SPACE FOUR NECESSARY COMPONENTS IN MECHANISM SIGNAL SEQUENCE WHICH IS CLEAVED - [NEAR N-TERMINAL]: SOME HYDROPHILIC AMINO ACIDS [e.g., ARGININE, GLUTAMATE] FOLLOWED BY HYDROPHOBIC AMINO ACIDS FOLLOWED BY ALANINE/X/ALANINE CYTOPLASMIC CHAPERONE TO PRESENT UN-FOLDED PROTEIN TO TRANSLOCON TRANSLOCON IN CYTOPLASMIC MEMBRANE TO TRANSLOCATE PROTEIN ACROSS CYTOPLASMIC MEMBRANE [N-TERMINUS FIRST] SIGNAL PEPTIDASE - ENZYME WHICH CLEAVES OFF THE SIGNAL AFTER ALANINE/X/ALANINE

RIBOSOME mRNA CHAPERONE DELIVERS UNFOLDED PROTEIN TO TRANSLOCON SIGNAL PROTEIN DESTINED FOR PERIPLASM TRANSLOCON - PUMPS PROTEIN THROUGH CELL MEMBRANE. N-TERMINUS EMBEDDED IN CELL MEMBRANE. SIGNAL PEPTIDASE CYTOPLASM PERIPLASM CYTOPLASMIC MEMBRANE SIGNAL SEQUENCE CLEAVED AND PROTEIN FOLDS IN PERIPLASM SIGNAL SEQUENCE COMPLETELY DEGRADED N TRANSLOCON

PILUS ASSEMBLY: CHAPERONE - USHER PATHWAY P PILI - COMPOSED OF SIX STRUCTUAL PROTEINS ALL SIX TRANSPORTED ACROSS CYTOPLASMIC MEMBRANE CHAPERONE CATALYZES PROPER FOLDING IN PERIPLALSM AND DELIVERS SUBUNITS TO USHER IN OUTER MEMBRANE PERIPLASMIC CHAPERONE CONDUCTS TO USHER EXPORT ACROSS CYTOPLASMIC MEMBRANE OUTER MEMBRANE PILUS USHER (PORE) PILIN MOLECULES LINKERS ADHESIN CYTOPLASM CHANNEL

TAKE AWAY: UNDERSTAND – PROTEINS MUST BE LOCALIZED TO PERFORM THEIR FUNCTION. CYTOPLASMIC MEMBRANE LOCALIZATION – STEPS & FACTORS INVOLVED PERIPLASMIC SPACE LOCALIZATION – STEPS & FACTORS INVOLVED PILUS ASSEMBLY HOW ARE THOSE PROTEINS RECOGNIZED/MARKED FOR THOSE DESTINATIONS? WHAT ARE THE SIGNALS? WHAT FACTORS RECOGNIZE & ACT ON THE SIGNALS?