Chain A ( E216 Q220 N328 D329 K330 Q333 S334 K335 T336 F337 T338 A339 K340 S341 D342 F343 S344 Q345 N372 Q373 K374 E375 F376 Q377 L378 Y379 S380 Y381 A382 V384 W393 K400 V420 L421 M422 T423 F424 K425 K426 D427 Y428 N491 S492 N493 K494 N495 L496 Q497 T498 I503 I506 D507 F508 D509 N510 N511 D512 I513 P514 R515 T516 D517 T518 I519 N520 I521 P522 N523 P524 M525 C526 T527 A528 I529 A530 A531 I589 Y590 Q592 N593 G594 N595 N596 P597 Q598 W599 E600 L601 D602 Y603 R604 Q605 E606 K607 I608 C609 W610 L611 A612 I613 P614 E615 K621 S622 P623 L624 L625 W626 F628 I629 )