การดื้อยาในกลุ่ม β-lactamจากการขาดโปรตีน CarO (Carbapenem-associated Outer membrane protein) การแทรกยีน carO โดยอินเซอร์ชันซีเควนทำให้ยีนไม่สามารถทำงานได้ ส่งผลให้ A. baumannii ดื้อยาในกลุ่ม Carbapenem แม้ CarO เป็นโปรตีนช่องทางการขนส่งสารแบบไม่จำเพาะ. นอกจากนี้การลดการแสดงออกของโปรตีน CarO และ OprD-like porin ยังเกี่ยวข้องกับการลดลงของความรุนแรงในการก่อโรคของ A. baumannii สายพันธุ์ดื้อยาทุกขนาน (Pandrug-resistant A. baumannii) ซึ่งสันนิษฐานว่าเป็นสิ่งที่ต้องแลกเปลี่ยน (Fitness cost) เพื่อให้ได้คุณบัติการดื้อยา.
การดื้อยาในกลุ่ม β-lactamจากการขาดหรือการลดการแสดงออกของโปรตีน OMP บางชนิด (22-23kDa, 33-36kDa, 37kDa, 43kDa, 44kDa, 47kDa, และ Heat-modifiable HMP-AB) การขาดโปรตีน OMP เหล่านี้ทำให้ A. baumannii สามารถดื้อต่อยาในกลุ่ม Carbapenem ได้เช่นกันโดยร่วมกับการเพิ่มการแสดงออกของเอนไซม์ β-lactamase ใน Class C หรือร่วมกับการรับยีนผลิตเอนไซม์ β-lactamase อย่าง OXA-23.
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